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 > Tutorials, Help & Repairs



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



Reply
 
LinkBack Thread Tools Display Modes
Old 06-03-2014, 11:52 PM #1
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
sellersmd sellersmd is offline
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
Default 445nm help

Hello. Long time lurker, first time poster here. I recently built a ~1.6W 445nm laser using a host, driver, lens, and focus adapter from jayrob and an M140 diode in a module from DTR. I've got my Eagle Pair glasses at the ready, and have read through all the good stickies about safety and what have you.

Equipment:
- c6 host from jayrob with copper heatsink
- whatever driver jayrob uses in his just-add-diode c6 18650 kit. (forgive my ignorance)
- 405-G-2 lens with focus adapter
- M140 445nm diode in 12mm module from DTR

Here's my question:

After putting my laser together, she lights up, she's bright, and she definitely burns things. BUT... I am concerned about beam divergence. I know the diode is multimode, so I won't get a nice, small dot and should instead expect a rectangle. However, even with the focus adapter cranked down as far as I can get it, the beam is still probably 10 x 20 inches at even 25 feet. I don't think that much divergence is normal.

Any suggestions? Is the lens still not close enough to the diode, perhaps?

Thanks in advance for your help.


sellersmd is offline   Reply With Quote







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







Old 06-03-2014, 11:59 PM #2
Class 1M Laser
 
Join Date: Feb 2014
Location: Geneva, IL
Posts: 140
Rep Power: 37
oahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond repute
oahu99 oahu99 is offline
Class 1M Laser
 
Join Date: Feb 2014
Location: Geneva, IL
Posts: 140
Rep Power: 37
oahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond repute
Default

To focus the laser you don't screw in the lens all the way.
Instead you just screw the lens in until the dot is the smallest.
Welcome to the forum!
oahu99 is offline   Reply With Quote
Old 06-04-2014, 12:10 AM #3
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
sellersmd sellersmd is offline
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
Default Re: 445nm help

Attempted but no success. The smallest beam was when the lens was screwed down as far as possible, and even then I get a big nasty spot. Other advice?

Last edited by sellersmd; 06-04-2014 at 12:16 AM.
sellersmd is offline   Reply With Quote
Old 06-04-2014, 02:25 AM #4
Class 1M Laser
 
Join Date: Feb 2014
Location: Geneva, IL
Posts: 140
Rep Power: 37
oahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond repute
oahu99 oahu99 is offline
Class 1M Laser
 
Join Date: Feb 2014
Location: Geneva, IL
Posts: 140
Rep Power: 37
oahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond reputeoahu99 has a reputation beyond repute
Default

Do you have the top of the module flush with the top of the heatsink?
Because if the module were recessed, then the lens wouldn't thread in all the way.
You could also try taking off the focusing ring to get the lens to thread deeper.
oahu99 is offline   Reply With Quote
Old 06-04-2014, 02:38 AM #5
KrowBar's Avatar
Class 1M Laser
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 42
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
KrowBar KrowBar is offline
Class 1M Laser
KrowBar's Avatar
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 42
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
Default Re: 445nm help

Yeah - it sounds like you aren't able to get the collimating lens close enough to the emitter. This could be due to the diode not being pressed completely into the module, mucked up threads in the front of the module/back of the lens barrel, or possibly a g-2 lens that is not close enough to the back of the barrel for some reason. Where is your glass in relation to the barrel?

Finally, you may just never be satisfied with the beam using that lens. A 3-element lens is quite cheap, but will give you a noticeably better beam with that diode. Also, it has a longer focal length so it will not need to get as close to the diode face still possibly allowing correct focus even if you are suffering from one of the above mentioned problems.

Finally, pictures always go a long way in helping diagnose problems, as well as helping others identify if they have a similar problem. We all like beam shots. Let's see that spot.
KrowBar is offline   Reply With Quote
Old 06-04-2014, 08:30 PM #6
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
sellersmd sellersmd is offline
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
Default Re: 445nm help

Thanks for the responses, guys. Sorry in advance for my sideways pictures, not sure why the iphone/tinypic decided to do that.

Quote:
Originally Posted by oahu99 View Post
Do you have the top of the module flush with the top of the heatsink?
Because if the module were recessed, then the lens wouldn't thread in all the way.
You could also try taking off the focusing ring to get the lens to thread deeper.
As a matter of fact, I was afraid of that very thing, so I have about 2-3mm of the module sticking out of the front of the heatsink:



And with focusing ring cranked down:



I wish I were able to unscrew the focusing ring from the barrel, but I can't. When I put the thing together and tried to screw it down to focus it, the barrel kept getting stuck and the focusing ring alone would come unscrewed from the barrel. To remedy this, I glued the focusing ring to the barrel. So taking the focusing ring off the barrel isn't likely. Unless you have a good plan for getting superglue out of little tiny threads:

(This is some left over thread tape in the threads, NOT super glue)



Quote:
Originally Posted by KrowBar View Post
Yeah - it sounds like you aren't able to get the collimating lens close enough to the emitter. This could be due to the diode not being pressed completely into the module, mucked up threads in the front of the module/back of the lens barrel, or possibly a g-2 lens that is not close enough to the back of the barrel for some reason. Where is your glass in relation to the barrel?

Finally, you may just never be satisfied with the beam using that lens. A 3-element lens is quite cheap, but will give you a noticeably better beam with that diode. Also, it has a longer focal length so it will not need to get as close to the diode face still possibly allowing correct focus even if you are suffering from one of the above mentioned problems.

Finally, pictures always go a long way in helping diagnose problems, as well as helping others identify if they have a similar problem. We all like beam shots. Let's see that spot.
In regards to the diode not being pressed all the way into the module, I don't know if it is or not. I bought the diode/module from DTR because of his reputation, so I hope that isn't it.

The threads in the module and the threads outside the barrel are both very smooth. As far as I can tell, the barrel threads completely into the module all the way until the focusing ring is flush with the module.

The lens is about 3mm from the back end of the barrel. How close is it supposed to be?

Here are some shots. The first two I am approximately ten feet from the wall (standard exterior door for scale) and the laser was rotated 90 degrees between the images. The third photo is from about 6ft.







I may have to just suck it up and buy a new lens/barrel. Do I need the longer barrel? What lens would you guys suggest for minimizing beam divergence? I don't mind if I lose a bit of power. Any other suggestions guys? Thanks in advance!

Last edited by sellersmd; 06-04-2014 at 08:31 PM.
sellersmd is offline   Reply With Quote
Old 06-04-2014, 08:54 PM #7
ChaosLord's Avatar
Class 2M Laser
 
Join Date: Feb 2013
Location: Louisville, KY
Posts: 763
Rep Power: 212
ChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond repute
ChaosLord ChaosLord is offline
Class 2M Laser
ChaosLord's Avatar
 
Join Date: Feb 2013
Location: Louisville, KY
Posts: 763
Rep Power: 212
ChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond reputeChaosLord has a reputation beyond repute
Default Re: 445nm help

If you do go with a new lens/lens barrel, I would suggest the extended barrel. I noticed that the 9mm 445 diodes require the lens to be closer to the diode than most other diodes I've dealt with.

The extended barrel will allow you to fully focus (and even over focus) it. I've come to prefer them, especially with a focus adapter, in order to get a full range of focus.
__________________
405nm SkyLaser PL 300-500 - ~500mW (523mW);| SkyLaser LP 5-80 - 5mW
405nm SkyRay 12X S06J w/450mA microboost - 485mW :|: BDR-209 16X w/700mA microboost 2X in ZeroLasers SkyRay and Chunk hosts
445nm ZeroLaser 2x18650 host 9mm w/2.3A X-drive - 2.8W :|: Trustfire A8 9mm w/2.4A X-drive - "The Sentinel" ~3W
445nm JetLasers PL-E - ~1.25W (1.32W) :|: 445nm 9mm w/2.4A X-drive Kryton "the Terminator" :|: Blord 501B build - 2.1W
450nm Osram PLTB450 in SL S4 host - 1.48W :|: 450nm Osram PL450B with ~280mA microboost in C6 host - 235mWBuild here
462nm 9mm diode in ZeroLasers chunk w/1.8A X-drive :|: M462 in sinner Cypreus-II w/microboost
473nm CNI lab 40mW
520nm NDG700 @1.8A in Cypreus-IIb - 1.04W :|: PL520 w/300mA x-boost in S4 host - 102mW Build here
532nm JetLasers Ti-B - 100mW (151mW)
589nm Dragonlasers Spartan 50mW
638nm Mits in SL C6 host custom build - 677mW :|: Opnext single mode 290mA x-drive in SL Steel C6 host w/ext. copper HS - 230mW
650nm copper module in C6 host - ~300mW (230mW) Build here
650nm module in custom host - ~300mW (224mW) "LiL Red Eye" Build Here

Radiant X4 3.7W LPM
Nospin 5W LPM
ChaosLord is offline   Reply With Quote
Old 06-04-2014, 09:49 PM #8
KrowBar's Avatar
Class 1M Laser
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 42
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
KrowBar KrowBar is offline
Class 1M Laser
KrowBar's Avatar
 
Join Date: May 2014
Location: Huntsville, Alabama
Posts: 128
Rep Power: 42
KrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond reputeKrowBar has a reputation beyond repute
Default Re: 445nm help

IIRC the flat part of the g2 lens should be very close to the back of the barrel. I think you might have the lens backward - just from seeing where the flat-head notch is. This is actually a somewhat easy mistake to make, so you wouldn't be the first. Are you sure it is facing the right way? The collimated beam should be exiting the curved side of the lens.

[edit] I just looked back at you OP and saw that you got the lens from Jayrob. I think he does put them in a flipped around barrel so the notched side will be toward the diode as you have it. Still worth checking which way the curved side faces though, just in case.

[edit2] Also, I just thought to ask, are you focusing while the laser is on, or turning it off between adjustments? I didn't see that mentioned so I'm not going to assume. It is very hard to get good focus by the latter method. Does slowly unscrewing the lens from the all-in position while the laser is on result in a slowly widening beam?

If it is in correctly and the focus ring gets flush with the module, then it sounds like it is keeping you from getting the lens close enough to the diode. Either way this would require removing the focusing ring. You could try soaking it in boiling water or acetone (not boiling acetone) to "unstick" the superglue. Or possibly heating it with a hair dryer/heat gun.

The 3-element lens with its longer focal length will give a rounder dot with less divergence, but not insignificant power loss (as much as 30%) It is only 8 or 10 dollars in a barrel, so you should get one even if it's just to help determine your preference.

Last edited by KrowBar; 06-04-2014 at 09:57 PM.
KrowBar is offline   Reply With Quote
Old 06-05-2014, 05:47 AM #9
IsaacT's Avatar
Class 4 Laser
 
Join Date: Aug 2010
Location: Austin, TX
Posts: 5,904
Rep Power: 933
IsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond repute
IsaacT IsaacT is offline
Class 4 Laser
IsaacT's Avatar
 
Join Date: Aug 2010
Location: Austin, TX
Posts: 5,904
Rep Power: 933
IsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond repute
Default Re: 445nm help

Hey man, you have your lens in backwards. That is why it isn't working for you. Try to use a vice and some leather maybe to hold the focus adapter, and use a screwdriver to turn the lens via the notches on the top of the lens.

Hopefully you can get it out. As I recall that Focus Adapter is 24 dollars.

__________________
ALL MY BUILDS/REVIEWS HERE *CLICK!*
MY BEST BUILDS: Adegan Relic | Aquarius | Frost | Ivy

Been bitten by the shutterbug hard.


Last edited by IsaacT; 06-05-2014 at 05:55 AM.
IsaacT is offline   Reply With Quote
Old 06-07-2014, 03:08 AM #10
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
sellersmd sellersmd is offline
Member
 
Join Date: Apr 2014
Location: Lubbock, Texas, USA
Posts: 37
Rep Power: 0
sellersmd has a spectacular aura aboutsellersmd has a spectacular aura aboutsellersmd has a spectacular aura about
Default Re: 445nm help

Well the glue wasn't too cooperative. Cracked the lens. new one on the way.
sellersmd is offline   Reply With Quote
Old 06-07-2014, 03:32 AM #11
IsaacT's Avatar
Class 4 Laser
 
Join Date: Aug 2010
Location: Austin, TX
Posts: 5,904
Rep Power: 933
IsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond repute
IsaacT IsaacT is offline
Class 4 Laser
IsaacT's Avatar
 
Join Date: Aug 2010
Location: Austin, TX
Posts: 5,904
Rep Power: 933
IsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond reputeIsaacT has a reputation beyond repute
Default Re: 445nm help

Better a new lens than a new focus adapter. Just make sure this time that the big grooves are facing away from the LD.

PS - as far as mistakes go that one isn't terrible, the only bad part was the glue. I have done much more costly mistakes so don't let it get you down.
__________________
ALL MY BUILDS/REVIEWS HERE *CLICK!*
MY BEST BUILDS: Adegan Relic | Aquarius | Frost | Ivy

Been bitten by the shutterbug hard.


Last edited by IsaacT; 06-07-2014 at 03:33 AM.
IsaacT is offline   Reply With Quote
Reply

Tags
405-g-2, 445nm, focusing, lens





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











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 04:52 AM.


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