DIY: 1W Green? eBay

jeffreythe00 · 10-02-2010, 04:32 AM

Saw this on eBay and im wondering how difficult it can be to build for only 100$ if it is efficient at all.

BIG GREEN LASER POINTER CAVITY DIODE OPTICS CRYSTAL KIT - eBay (item 170544504918 end time Oct-04-10 01:18:25 PDT)

Edit: does need a better 808 pump. It comes with a 500mw 808 pump. The seller claims the optics and crystals will handle 5W if needed.

Found these on ebay: http://cgi.ebay.com/5W-808nm-High-Po...item3f037816ea

Should be okay?

Pilgor · 10-02-2010, 04:35 AM

your not going to get 1W of green out of 1W 808 from what I've read in the past.

jeffreythe00 · 10-02-2010, 04:37 AM

Quote:

Originally Posted by Pilgor

your not going to get 1W of green out of 1W 808 from what I've read in the past.

No, but it states in the auction that the crystals can handle up to 5W of 808

rev0 · 10-02-2010, 06:05 AM

Quote:

Originally Posted by jeffreythe00

No, but it states in the auction that the crystals can handle up to 5W of 808

Correction, 2W. The assembly can fit/handle up to 5W lasers, I guess:

Quote:

Originally Posted by aerodynamics2006

CRYSTAL WILL HANDLE UP TO 2 WATTS OF 808nm PUMP POWER AND OPTICS WILL HANDLE OVER 5 WATTS OF PUMP POWER IF REQUIRED.

qumefox · 10-03-2010, 03:08 AM

Best case is you could get 600mW using a 2W pump. However he claims 80mW using 500mW pump.. so that's more like 300mW out of a 2W pump.

Still not bad for the price.. however i'd almost rather have separate crystals instead of a bonded pair. That way they could be heated/cooled independently for maximum efficiency.

madog · 10-05-2010, 02:36 AM

The optics can handle over 5watts if required. Crystals only 2

jeffreythe00 · 10-05-2010, 01:03 PM

thanks guys for clearing that up. I still don't think its a bad deal for anyone looking to make their own green especially if you wanted to swap out the crystals and the pump 8D

lasersbee · 10-05-2010, 02:05 PM

Don't forget that he says the 500mW 808nm supplied has
a Grin lens (FAC lens)... and if you buy a good 5Watt C-Mount
with FAC lens it will cost a bit more than what you linked to...
I believe the Laser you linked to does not have a Fast Axis
Correction lens...

Here is one that does...

5000mw 808nm laser diode with fast Axis Lens on eBay.ca (item 120627789930 end time 29-Oct-10 11:41:15 EDT)

BTW... as it is being sold... it would be a good way to learn
the ins and outs of a raw 532nm build...

Jerry

Cyparagon · 10-05-2010, 02:57 PM

You wont get 1W without lots of fine tuning and temp control. The DIY greens I've seen in the past topped out at around 50mW.

ElektroFreak · 10-05-2010, 03:11 PM

Quote:

Originally Posted by qumefox

Best case is you could get 600mW using a 2W pump. However he claims 80mW using 500mW pump.. so that's more like 300mW out of a 2W pump.

Still not bad for the price.. however i'd almost rather have separate crystals instead of a bonded pair. That way they could be heated/cooled independently for maximum efficiency.

The efficiency of the crystals increases with pump power rather than staying the same and scaling linearly. This means that more pump power equals SIGNIFICANTLY more green output in a properly aligned cavity.

qumefox · 10-05-2010, 03:29 PM

Quote:

Originally Posted by ElektroFreak

The efficiency of the crystals increases with pump power rather than staying the same and scaling linearly. This means that more pump power equals SIGNIFICANTLY more green output in a properly aligned cavity.

Really? Learn something new every day. Is the increase in efficiency logarithmic or.. just not linear. heh.

ElektroFreak · 10-06-2010, 01:02 AM

It's non-linear to a degree, but I don't think it's as simple as saying it's logarithmic due to different heat and crystal-structure effects and the host of other things going on in there. While I can't quantify it myself, I know that pulsed lasers get very efficient doubling in a single pass from KTP because of the high peak powers generated.

BEAMANN · 10-06-2010, 01:22 AM

So when it comes to the chineese cheeppys 532nm 5mw pointers, what is the I.R. pumping out to get 5mw green?

qumefox · 10-06-2010, 01:47 AM

sometimes up to 200mW.

rev0 · 10-07-2010, 02:29 AM

For the sheer awe of seeing a green laser beam that bright. I've been quite happy with my 50mW (half as bright as my >1W 445nm, perceptually) and I can't wait to get some higher power greens. I'm also delving a bit into the idea of building my own greenies, since I've got 2 cheap crystal sets from broken 5mW pointers, and I've got a 300mW pump diode on the way (may or may not work, I've read many of the ones sold on Ebay are out of spec with the wavelength, but it will be a learning experience).

10-02-2010, 04:32 AM	#1
jeffreythe00 Class 3R Laser Join Date: Jan 2010 Location: USA, Plains, Pennsylvania Posts: 2,051 Rep Power: 147	DIY: 1W Green? eBay Saw this on eBay and im wondering how difficult it can be to build for only 100$ if it is efficient at all. BIG GREEN LASER POINTER CAVITY DIODE OPTICS CRYSTAL KIT - eBay (item 170544504918 end time Oct-04-10 01:18:25 PDT) Edit: does need a better 808 pump. It comes with a 500mw 808 pump. The seller claims the optics and crystals will handle 5W if needed. Found these on ebay: http://cgi.ebay.com/5W-808nm-High-Po...item3f037816ea Should be okay? __________________ Want to be a part of the member map? Pm me! Personal lasers 800nm 40W PressTek INC Fiber Coupled Diode 660nm >100mW Newwish 635nm 500mW 501B 532nm 130mW Wicked Lasers Executive Pro: Nexus 532nm >150mW Jetlasers Ti B 532 532nm 100mW Aixiz TTL Tunable Lab Laser Click for more info 3x 532nm 20mW Newwish Laser's 445nm >1W 1st Gen Kryton Groove 445nm 800mw Wicked Lasers Arctic 405nm >50mW Newwish 473nm 7mWB&W Tek Labby 1064nm Passive Q-switch ND:YAG SSY-1 Multi KW Pulses. 10600nm 13W Air Cooled RF Excited Co2 Multiline >40mW 8 line JDSU Uniphase Small Frame Argon Wicked Lasers Torch 20W Coherent 200 LPM Last edited by jeffreythe00; 10-02-2010 at 04:46 AM.

10-02-2010, 04:35 AM	#2
Pilgor Class 2M Laser Join Date: Oct 2009 Location: Timmins, Ontario, Canada Posts: 509 Rep Power: 15	Re: DIY: 1W Green? eBay your not going to get 1W of green out of 1W 808 from what I've read in the past.

10-03-2010, 03:08 AM	#5
qumefox Class 3B Laser Join Date: Mar 2010 Location: Jackson, TN Posts: 3,225 Rep Power: 75	Re: DIY: 1W Green? eBay Best case is you could get 600mW using a 2W pump. However he claims 80mW using 500mW pump.. so that's more like 300mW out of a 2W pump. Still not bad for the price.. however i'd almost rather have separate crystals instead of a bonded pair. That way they could be heated/cooled independently for maximum efficiency. __________________ Wavelengths in 'The Collection' 685nm, 655nm, 635nm, 589nm, 532nm, 473nm, 445nm, 405nm

10-05-2010, 02:36 AM	#6
madog Class 2M Laser Join Date: May 2010 Location: ohio Posts: 530 Rep Power: 20	Re: DIY: 1W Green? eBay The optics can handle over 5watts if required. Crystals only 2 __________________ 635nm 800mw in a Cree C3 w/mosquito thanks RHD 635nm 300mw labby 600mw JetL PL-C 880mw Peak Thanks Hak and Gray 445nm 1550mw Wolf800 Thanks Flaminpyro 405nm 600mw in a Cree C3 Thanks Daguin Plus a handful of miscellaneous cheapy handhelds

10-05-2010, 01:03 PM	#7
jeffreythe00 Class 3R Laser Join Date: Jan 2010 Location: USA, Plains, Pennsylvania Posts: 2,051 Rep Power: 147	Re: DIY: 1W Green? eBay thanks guys for clearing that up. I still don't think its a bad deal for anyone looking to make their own green especially if you wanted to swap out the crystals and the pump 8D __________________ Want to be a part of the member map? Pm me! Personal lasers 800nm 40W PressTek INC Fiber Coupled Diode 660nm >100mW Newwish 635nm 500mW 501B 532nm 130mW Wicked Lasers Executive Pro: Nexus 532nm >150mW Jetlasers Ti B 532 532nm 100mW Aixiz TTL Tunable Lab Laser Click for more info 3x 532nm 20mW Newwish Laser's 445nm >1W 1st Gen Kryton Groove 445nm 800mw Wicked Lasers Arctic 405nm >50mW Newwish 473nm 7mWB&W Tek Labby 1064nm Passive Q-switch ND:YAG SSY-1 Multi KW Pulses. 10600nm 13W Air Cooled RF Excited Co2 Multiline >40mW 8 line JDSU Uniphase Small Frame Argon Wicked Lasers Torch 20W Coherent 200 LPM

10-05-2010, 02:05 PM	#8
lasersbee Class 4 Laser Join Date: Sep 2008 Location: Quebec, Canada Posts: 14,698 Rep Power: 559	Re: DIY: 1W Green? eBay Don't forget that he says the 500mW 808nm supplied has a Grin lens (FAC lens)... and if you buy a good 5Watt C-Mount with FAC lens it will cost a bit more than what you linked to... I believe the Laser you linked to does not have a Fast Axis Correction lens... Here is one that does... 5000mw 808nm laser diode with fast Axis Lens on eBay.ca (item 120627789930 end time 29-Oct-10 11:41:15 EDT) BTW... as it is being sold... it would be a good way to learn the ins and outs of a raw 532nm build... 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 discounted for LPF Members.... 2W LaserBee A Laser Power Meter LaserBee 2.5W USB LPM LaserBee 3.7W USB LPM Available on eBay:Check availability here... This banner is available to and can be copied/used FREE by any LaserBee owner

10-05-2010, 02:57 PM	#9
Cyparagon Class 4 Laser Join Date: Sep 2007 Location: Wisconsin Posts: 6,510 Rep Power: 322	Re: DIY: 1W Green? eBay You wont get 1W without lots of fine tuning and temp control. The DIY greens I've seen in the past topped out at around 50mW. __________________ A problem well stated is a problem half solved.

10-06-2010, 01:02 AM	#12
ElektroFreak Class 4 Laser Join Date: Nov 2008 Posts: 5,719 Rep Power: 366	Re: DIY: 1W Green? eBay It's non-linear to a degree, but I don't think it's as simple as saying it's logarithmic due to different heat and crystal-structure effects and the host of other things going on in there. While I can't quantify it myself, I know that pulsed lasers get very efficient doubling in a single pass from KTP because of the high peak powers generated. __________________ Laser Resources (for n00bs and veterans alike!) Sam's Laser FAQ (The Laser Bible) http://www.repairfaq.org/sam/laserfaq.htm RP Photonics Encyclopedia of Laser Physics and Technology http://www.rp-photonics.com/encyclopedia.html ULTIMATE DIY PROJECTOR REFERENCE http://nqlasers.com/scannerreference...itle=Main_Page SUCCESS is the best revenge.

10-06-2010, 01:22 AM	#13
BEAMANN Class 1 Laser Join Date: Sep 2010 Location: Phoenix, Az Posts: 58 Rep Power: 5	Re: DIY: 1W Green? eBay So when it comes to the chineese cheeppys 532nm 5mw pointers, what is the I.R. pumping out to get 5mw green?

10-06-2010, 01:47 AM	#14
qumefox Class 3B Laser Join Date: Mar 2010 Location: Jackson, TN Posts: 3,225 Rep Power: 75	Re: DIY: 1W Green? eBay sometimes up to 200mW. __________________ Wavelengths in 'The Collection' 685nm, 655nm, 635nm, 589nm, 532nm, 473nm, 445nm, 405nm

10-07-2010, 02:29 AM	#15
rev0 Class 1M Laser Join Date: May 2010 Location: Southern CA, USA Posts: 106 Rep Power: 8	Re: DIY: 1W Green? eBay For the sheer awe of seeing a green laser beam that bright. I've been quite happy with my 50mW (half as bright as my >1W 445nm, perceptually) and I can't wait to get some higher power greens. I'm also delving a bit into the idea of building my own greenies, since I've got 2 cheap crystal sets from broken 5mW pointers, and I've got a 300mW pump diode on the way (may or may not work, I've read many of the ones sold on Ebay are out of spec with the wavelength, but it will be a learning experience). __________________ 405/532/650nm - RGV, Custom USB (in progress) 405nm - 2x 100mW PHR AA/14500 405nm - 120mW "SharkDrive" USB 445nm - 1W+ Stainless 18650 532nm - 50mW DX Module 650nm - 85mW MXDL AA (Gifted to a friend) 780nm - 110mW 9-LED 3-AAA Safety - OEM AL3 Goggles

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