Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > 445nm Lasers



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 08-07-2010, 11:08 PM #1
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

So yeah, I got this diode from theMonk, who got it from daguin. It's supposedly a "zombie", but I haven't powered it on to look, but I'll trust them.

If it is lasing, I'm freakin' impressed. I've watched this kind of damage happen to a diode under a microscope before, watching as it happened. It's not pretty, but it is pretty awesome to watch. So yeah, here are some macros of this diode that Dave treated so cruelly. Enjoy!

WARNING: These images of diode carnage are not for the faint of heart. If you care deeply about diodes and can't stand destruction, look away. You have been warned.

Oh, and sorry they're all upside down, the light worked better that way. And the color balance is screwy on many of them, so yeah, sorry.

--------------------------------------------

First, the typical 45deg shot. You can see the pedestal, the base the diode is mounted on, some bonding wires, and the front facet of the diode. Depth-of-field sucks, so that's all you can see. Can't see any damage yet...





Next, an end-on view of the facet of the diode. A pretty sweet image. The facet is the bright part.





And now, a low-mag top-down image of the diode, totally cringe-worthy





And the same image, apologies for the color balance, but with a handy scale bar. In case you can't read it, the die is about 1200 microns long.





Moving on, next magnification, again a view of the diode's front facet. Not a bad image at all.





And, the next image is the same magnification, again top-down. Ouch. Yeah, this diode went through a terrible event in its life. I anticipate intensive therapy for the rest of its life.





One more top-down image, zoomed in a bit on the top facet. Even through all the destruction, you can see some of the interesting bits of the diode's structure (especially down in the bottom left hand corner of the image where the output facet is) related to an on-going thread in the Science sub-section regarding multiple lateral mode diode.

Sadly, this is just the 3rd of 6 magnification levels available. I was able to use all 6 objectives on the facet (see below), but not on the top-down view. In order to use the 3 higher magnifications, I'll have to remove the diode from the 5.6mm can base, because that base prevented the objective from getting close enough to see the diode, since the working distance gets to be much less than 2mm.





And now, zooming in on the facet of the diode. This is the 3rd magnification level. Curiouser and curiouser.





4th magnification level. I see a ridge there....





Same, with some scale bars.





5th magnification level.





And 6th and final level of magnification. Yep, that's a 15 micron ridge there for some later waveguiding of some kind. And some pretty impressive imaging, if I do say so myself. A little bit of tinkering/deconstructing, and this level of magnification may be achievable in the top-down view. Then of course, there are also electron microscopes as well.



pullbangdead is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 08-07-2010, 11:14 PM #2
aryntha's Avatar
Class 3R Laser
 
Join Date: Nov 2009
Location: Evergreen, CO
Posts: 2,027
Rep Power: 2778
aryntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond repute
aryntha aryntha is offline
Class 3R Laser
aryntha's Avatar
 
Join Date: Nov 2009
Location: Evergreen, CO
Posts: 2,027
Rep Power: 2778
aryntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond reputearyntha has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Wow. It seems like where the bonding wires make contact, that 'plate' has almost been eaten away, but if it's still lasing - likely enough remains to make enough contact with the p/n junction...

I guess it's when the facets go, thats when it goes LED. But it seems that everything AROUND the die has gotten incredibly hot, but the die has survived...

He did say this one still lases?, is that right?
__________________

3392nm:REO LHIP HeNe 2mW ∙ 980nm:OLIKE 155mW

808nm:OLIKE 200mW ∙ JETL PLC 600mW(682pk)
780nm:OLIKE 120mW
685nm:18650 47mW
671nm:PGL3M 281mW DPSS ∙ PGL3C 278mW
655nm:LOC 254mW ∙ OLIKE 221mW ∙ Yob 320mW
638nm:Sanyo 40mW ∙ HL63133 200mW ∙ PGL3C 463mWpk ∙ ML520 700mW
633nm:JDS1145 HeNe 28mW ∙ JDS1145 HeNe 26mW
612nm:MG 05LOR151 HeNe 3mW ∙ REO LSTP 3mW
609nm:REO LHOR 1mW
604nm:REO LSTP 2mW
594nm:Rigel 3mW ∙ LG PGL3C 15mWpk ∙ Lasos 7512 3mW ∙ CNI MGL3 58mWpk
589nm:CNI PGL3C 106mW ∙ CNI PGL3C 85mW
561nm:CNI PGL3C 30mW(41pk)
556nm:CNI PGL3C 20mW(22pk)
544nm:JDS1675P HeNe 2mW ∙ REO LHGR 2mW ∙ Lasos 7786 2mW
532nm:PGL3C 150mW(180pk) ∙ PGL3C 578mWpk ∙ PLC 440mWpk
515nm:JDS 221420GL ArI 30mW
510nm:52mW DG#2 ∙ 50mW 26650 DG
488nm:Nlx DPSS 7mW ∙ JDS 2214 ArI 40mW ∙ JDS FCD488 DPSS 25mW
ML:MG 65A106025 ArI ML 115mW
476/480nm:Nichia Diode 28mW
473nm:PGL3A 45mW(80pk) ∙ PGL3C 110mWpk ∙ PGL3C 95mWpk ∙ RPLB-25 60mWpk
465nm:DTR NDB7676 2.03w
458nm:JDS 2214VL ArI 8mW ∙ JDS 2214VL ArI 12mW ∙ RHD Diode 1.7W
452nm:Osram SM 47mW
445nm:Yob 1410mW ∙ Polaris 156mW ∙ PGL3C 1200mW ∙ DTR-EHG 32650 2136mW
405nm:Yob 630mW ∙ Qfox 750mW ∙ JETL PLC 780mW
aryntha is offline   Reply With Quote
Old 08-07-2010, 11:24 PM #3
lasersbee's Avatar
Class 4 Laser
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,690
Rep Power: 38652
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
lasersbee lasersbee is offline
Class 4 Laser
lasersbee's Avatar
 
Join Date: Sep 2008
Location: Quebec, Canada
Posts: 15,690
Rep Power: 38652
lasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond reputelasersbee has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

From the metal splatter on the top of the Die...
I would really be surprised if it had any type of output..

@PBD.... nice macro photos... the top of the die shots
are amazing...

Jerry
__________________

J.BAUER Electronics Home Page

LaserBee Laser Power Meter Products meet your needs
at affordable Prices:
See them all here on LPF

LaserBee Power Meter products ALWAYS in Stock
and ready to ship

Also available on eBay:Check availability here..

Subsidary: Pharma Electronic Solutions


This banner is available to and can be copied/used FREE by any LaserBee owner
lasersbee is offline   Reply With Quote
Old 08-07-2010, 11:24 PM #4
RA_pierce's Avatar
Class 3B Laser
 
Join Date: Sep 2007
Location: Southern California
Posts: 3,258
Rep Power: 3873
RA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond repute
RA_pierce RA_pierce is online now
Class 3B Laser
RA_pierce's Avatar
 
Join Date: Sep 2007
Location: Southern California
Posts: 3,258
Rep Power: 3873
RA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Pictures are awesome.

I have a "zombie" de-canned 405 (LG 8X burner). It will still lase. Last I measured, It's still producing ~300mW at random current (between 200 and 300mA, I think 260). The beam profile sucks, though. Looks like this: (0).

I don't really have any use for it besides reminding me that I cooked $200. Does you or anyone else have any use for it?
RA_pierce is online now   Reply With Quote
Old 08-07-2010, 11:28 PM #5
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

He did say it still lases.

Basically what has happened is the metal contact pad, which is most likely deposited by some process like electron-beam evaporation or sputtering, has been blown off of the diode in most places. I've seen it happen live in a microscope. When it happens, it looks almost like bolts of lighting shooting through the diode, from one end to the other, you can watch it race through delaminating/throwing the metal off. It leaves pits, craters, metal pieces. There's still metal there making contact in places, and the metal is pretty far from the light (relative to the size of the light, that is) in the diode anyway, so the active region is maybe not physically damaged, but who knows? But getting the current into the diode is tough when you've blown all the contact metal off the device.

Making metal to p-type doped GaN is notoriously difficult. It's hard to get an Ohmic contact, so you very often end up with a mini Schottky diode where the metal touches the semiconductor. This can absorb heat, bad things can happen, etc. It's a weak point, and it breaks sometimes.

Last edited by pullbangdead; 08-07-2010 at 11:31 PM.
pullbangdead is offline   Reply With Quote
Old 08-07-2010, 11:33 PM #6
Pontiacg5's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Location: Ottawa, Kansas
Posts: 2,524
Rep Power: 121
Pontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond repute
Pontiacg5 Pontiacg5 is offline
Class 3B Laser
Pontiacg5's Avatar
 
Join Date: Dec 2007
Location: Ottawa, Kansas
Posts: 2,524
Rep Power: 121
Pontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

That's pretty cool! I needed some of these measurements for my 3d model of this diode!
Pontiacg5 is offline   Reply With Quote
Old 08-08-2010, 12:40 AM #7
FireMyLaser's Avatar
Class 3B Laser
 
Join Date: Jan 2008
Location: Sweden
Posts: 3,052
Rep Power: 567
FireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond repute
Send a message via MSN to FireMyLaser
FireMyLaser FireMyLaser is online now
Class 3B Laser
FireMyLaser's Avatar
 
Join Date: Jan 2008
Location: Sweden
Posts: 3,052
Rep Power: 567
FireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond reputeFireMyLaser has a reputation beyond repute
Send a message via MSN to FireMyLaser
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Best pictures ever taken. Ever.

Is the laser output coming from that 15 micron ridge?
__________________
Niko likes cereal.
FireMyLaser is online now   Reply With Quote
Old 08-08-2010, 12:54 AM #8
Traveller's Avatar
Class 3R Laser
 
Join Date: Dec 2008
Location: curr. Vienna, AT
Posts: 1,223
Rep Power: 216
Traveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond repute
Traveller Traveller is offline
Class 3R Laser
Traveller's Avatar
 
Join Date: Dec 2008
Location: curr. Vienna, AT
Posts: 1,223
Rep Power: 216
Traveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond reputeTraveller has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Great work, PBD! Do you have a camera system directly connected to a professional microscope?
__________________
Traveller - Geneva * Melbourne * Miami * Vienna

lasers * Reviews
Traveller is offline   Reply With Quote
Old 08-08-2010, 01:29 AM #9
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Quote:
Originally Posted by Traveller View Post
Great work, PBD! Do you have a camera system directly connected to a professional microscope?
Thanks. I had a legitimate work interest in this, so I didn't mind using work tools. I don't use work tools for personal gain, but since I had a work interest in these, I figured you guys could benefit a little as well.

And so yes, these images were taken using something akin to this



plus this.



Quote:
Originally Posted by FireMyLaser View Post
Best pictures ever taken. Ever.

Is the laser output coming from that 15 micron ridge?
Thanks!

And kinda, yeah. Laser diode makers etch the ridge to form a lateral waveguide, but you don't etch all the way through the active region, so the active region is actually still in the bulk below the ridge, not "within" the ridge. The mode(s) would be located somewhere kinda like this attachment. This is not to scale and is approximate in every way, but shows the idea of hoe most of the mode is not within the ridge, but the ridge still acts to confine the mode. The mode is in red, with active region is the blue line. Without the ridge, the mode would spread out to the right and left much wider. The height of the mode is controlled by putting different layers in, and not as much by the ridge itself.

So yeah, the light is all coming out just "below" (above in my upside-down images) the ridge. Puts it into perspective, eh? The actually emitting region is still just a tiny fraction of the die; even in the last image with such huge magnification, the actual part where there is laser emission is still small.

This ridge is 15um wide, which is why it is multiple lateral modes. For single mode diodes, like everything that comes out of an optical storage drive (405nm, 660nm from Blu-Ray and DVD), that ridge is narrower, like 1 or 2 um wide. The PHR diode has a 1.5 micron ridge, for instance.

Oh, and duh, the ridge has another purpose: current guiding! The best way to do it is to inject current only straight down through the top of the ridge. So if all the current is coming in through the ridge, as much of it as possible goes into the optical mode. For stimulated emission, you need the light and the current both in the same place, so this helps to ensure that all the current ends up in the same place as the light. Which points out another cool thing about these devices: ALL the current you're putting in is passing through that ridge, which is 15 microns wide and 1200 microns long. The current comes in through the wires, flows laterally through the metal film, and then straight down through that small ridge.
Attached Thumbnails
Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY-ridgelaser.png  

Last edited by pullbangdead; 08-08-2010 at 01:49 AM.
pullbangdead is offline   Reply With Quote
Old 08-08-2010, 01:44 AM #10
daguin's Avatar
Super Moderator
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1432
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
daguin daguin is offline
Super Moderator
daguin's Avatar
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1432
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

VERY cool!

The diode was still producing ~200mW at high current when I sent it to The Monk

Peace,
dave
__________________
How To Get Along In and Be Accepted in the Forum

If you got some value out of reading this forum, how about donating $2 to keep it going?
Click Here to donate

Love all, trust a few, do wrong to none.
-William Shakespeare
daguin is offline   Reply With Quote
Old 08-08-2010, 02:02 AM #11
pullbangdead's Avatar
Class 3R Laser
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
pullbangdead pullbangdead is offline
Class 3R Laser
pullbangdead's Avatar
 
Join Date: Aug 2007
Posts: 2,045
Rep Power: 238
pullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond reputepullbangdead has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Thanks, Dave.

Also, I just did another little calculation based on some other info I had forgotten....

With diodes and how they break, it's often not so much about current as it is about current density: as in how much current is flowing through the area of the diode.

So this diode is 1200um x 15um. Somebody check my math here, but I get that working out to ~.00018 cm^2. Pushing 1A of current through this gives a current density of ~5.6 kA/cm^2. Believe it or not, that's a low number.

Let's compare to the PHR: the PHR is ~ 400um v 1.5um, giving an area of .000006 cm^2. At a typical operating current of .1A = 100mA, that gives a current density of, get this, ~16.7kA/cm^2.

So at least as far as current density, these things actually operate at a pretty low number, despite the fact that they operate at such huge currents. The threshold current density is, well, it's impressive. I know 200mA seems like a lot of current, but it's really not much at all when you look at how big the diode is. The PHR's threshold current density is higher than the operating current density of this diode when driving it with 1A of current.

There are a LOT of differences though with different diodes, so please don't read much into this post, other than to say I'm impressed with these diodes. Unless my math is wrong? Can anyone else check it?

Last edited by pullbangdead; 08-08-2010 at 02:06 AM.
pullbangdead is offline   Reply With Quote
Old 08-08-2010, 03:01 AM #12
Pontiacg5's Avatar
Class 3B Laser
 
Join Date: Dec 2007
Location: Ottawa, Kansas
Posts: 2,524
Rep Power: 121
Pontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond repute
Pontiacg5 Pontiacg5 is offline
Class 3B Laser
Pontiacg5's Avatar
 
Join Date: Dec 2007
Location: Ottawa, Kansas
Posts: 2,524
Rep Power: 121
Pontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond reputePontiacg5 has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Is it just possible they can be pushed further than 1A?

I don't know enough about diode workings to have a serious intellectual conversation
Pontiacg5 is offline   Reply With Quote
Old 08-08-2010, 03:05 AM #13
daguin's Avatar
Super Moderator
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1432
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
daguin daguin is offline
Super Moderator
daguin's Avatar
 
Join Date: Mar 2008
Location: Sunny Southern California
Posts: 16,636
Rep Power: 1432
daguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond reputedaguin has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Quote:
Originally Posted by Pontiacg5 View Post
Is it just possible they can be pushed further than 1A?

I don't know enough about diode workings to have a serious intellectual conversation

We are pushing them past 1A regularly now

Peace,
dave
__________________
How To Get Along In and Be Accepted in the Forum

If you got some value out of reading this forum, how about donating $2 to keep it going?
Click Here to donate

Love all, trust a few, do wrong to none.
-William Shakespeare
daguin is offline   Reply With Quote
Old 08-08-2010, 03:35 AM #14
Spartan X's Avatar
Class 1M Laser
 
Join Date: Jun 2010
Posts: 241
Rep Power: 10
Spartan X is a jewel in the roughSpartan X is a jewel in the roughSpartan X is a jewel in the rough
Spartan X Spartan X is offline
Class 1M Laser
Spartan X's Avatar
 
Join Date: Jun 2010
Posts: 241
Rep Power: 10
Spartan X is a jewel in the roughSpartan X is a jewel in the roughSpartan X is a jewel in the rough
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Images are not showing up for me :-(
__________________
My lifestyle determines my deathstyle.
Spartan X is offline   Reply With Quote
Old 08-08-2010, 04:37 AM #15
RA_pierce's Avatar
Class 3B Laser
 
Join Date: Sep 2007
Location: Southern California
Posts: 3,258
Rep Power: 3873
RA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond repute
RA_pierce RA_pierce is online now
Class 3B Laser
RA_pierce's Avatar
 
Join Date: Sep 2007
Location: Southern California
Posts: 3,258
Rep Power: 3873
RA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond reputeRA_pierce has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

@Pullbangdead,
When constructing diodes for high power, what exactly is it that makes them more robust?

How is it that we can "kill" these diodes and still get it to lase at close to "normal" outputs? And how does it affect the emitted modes?

Up until I "killed" my 8x, I had never witnessed a "zombie" failure. Most of us have witnessed the "LED effect," and I've burned up a diode to no output, but I'm having trouble understand what has to be damaged for a diode to go "zombie."
I mean... if I look at my zombie 8X under a microscope should it look similar?
RA_pierce is online now   Reply With Quote
Old 08-08-2010, 04:53 AM #16
Gryphon's Avatar
Class 3R Laser
 
Join Date: May 2009
Location: Panama City, Florida
Posts: 1,838
Rep Power: 182
Gryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond repute
Gryphon Gryphon is offline
Class 3R Laser
Gryphon's Avatar
 
Join Date: May 2009
Location: Panama City, Florida
Posts: 1,838
Rep Power: 182
Gryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond reputeGryphon has a reputation beyond repute
Default Re: Dave is Mean to his Diodes (445 Macros) IMAGE HEAVY

Really awesome pictures. I sure wish i had a microscope, the microscopic world looks pretty neat
__________________
I see................wait, what now?

(3x) 405nm
(6x) 445nm
(4x) 532nm
(1x) 543nm
(1x) 632.8nm
(1x) 635nm
(3x) 660nm
SSY-1 Laser
Gryphon is offline   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


LinkBacks (?)
LinkBack to this Thread: http://laserpointerforums.com/f65/dave-mean-his-diodes-445-macros-image-heavy-54033.html
Posted By For Type Date
445 - Hobbi TV This thread Refback 05-14-2013 12:27 PM
Cool pics from LPF This thread Refback 04-12-2012 04:25 PM
????? ???????? ???? | ????? This thread Refback 09-06-2011 01:11 PM
445 - 31 - Hobbi TV This thread Refback 02-20-2011 05:50 PM
445 - Hobbi TV This thread Refback 02-19-2011 04:12 PM
445 - Hobbi TV This thread Refback 02-12-2011 10:01 AM










Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 01:44 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC