Old 04-08-2014, 01:55 PM #1
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Default How focus 445nm blue laser beam lens

I looked for an existing thread on this before posting but didn't see one. Apologies in advance if I just missed it.

I just completed my first laser build and everything seems to be working, except that I can't get the laser dot to really focus. I've been screwing and unscrewing the lens to change the distance from the diode, but even when I get close to the "sweet spot", there's still a large, lopsided corona of light around the laser dot. See the attached image.


Here's the diode module I purchased: Link

The lens is a 3-layer glass lens, adjustable from 200nm - 1100nm that I had purchased with an Aixiz module previously.

Please advise on what I can best do to get the beam as effectively collimated to parallel as possible.

Thanks in advance!


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Old 04-08-2014, 02:13 PM #2
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Default Re: How focus 445nm blue laser beam lens

Flip that bad boy around

Have you disassemble the lens at all?
And is that as small as you can get it?
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Last edited by Tmack; 04-08-2014 at 02:15 PM.
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Old 04-08-2014, 02:22 PM #3
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Default Re: How focus 445nm blue laser beam lens

Looks to me like the lens is in backwards. Just unscrew the silver focusing nut on the front, thread it on the other side, and you will be A-OK!
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Old 04-08-2014, 02:31 PM #4
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Default Re: How focus 445nm blue laser beam lens

That's what I meant by flip it around
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Old 04-08-2014, 03:07 PM #5
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Default Re: How focus 445nm blue laser beam lens



Fixed now.



Thanks!
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Old 04-08-2014, 03:13 PM #6
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Default Re: How focus 445nm blue laser beam lens

What kind of host is that?
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Old 04-08-2014, 03:32 PM #7
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Default Re: How focus 445nm blue laser beam lens

I just grabbed an old external hard drive enclosure I had laying around, gutted it, drilled a hole for the diode assembly and power switch and then mounted the driver inside.

It works great--lots of space for heat diffusion and/or additional heat sinks, vents along the side for heat management, what I consider a quality look and feel, etc.
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Old 04-08-2014, 04:38 PM #8
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Default Re: How focus 445nm blue laser beam lens

Mount a little fan in that bad boy
Have it passing air right over your heatsink, and driver.
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Old 04-08-2014, 05:10 PM #9
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Default Re: How focus 445nm blue laser beam lens

You mean no liquid cooling? I suppose I'll have to find just the right LED fan. Maybe add a little SFX box to make Star Wars noises.

I've just crossed a dangerous threshold. This was my first electronics project and apparently making DiY "sci-fi" gadgets is highly addictive.
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Old 04-08-2014, 05:16 PM #10
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Default Re: How focus 445nm blue laser beam lens

Lol you got that right.

I've bought 5 9mm, 2 mitsu 500, 2 s0j6, 1 16x 405 drivers to match and a dozen hosts, in the last couple months. The majority went to their buyers, but that's a ton of money in parts!
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405nmMarble Zaser 1060mw *
405nmFocus pen 80mw Pman
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445nmMarble Zaser 2940mw*
445nmMag Light Mr crouse Heatsink 2790mw Jayrob & Speedy78*
445nmWicked Laser EVO E2 Custom M140 G2 1580mw*
520nm Sipik 125mw*
532nmHL532 505mw bloompyle
532nmCree B68 Pman Special 120mw, B&D 86mw,
638nmMarble Zaser 510mw *
650nmSFCR 280mw Joker
LK-3D Projector Hakzaw1 GB
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R, G, B, V Marble Zaser set
Need a custom build? Send me a message

LED's - TK75vn killerthrow, BTU Shockervn, MX25L3vn, D40avn, TK61vn ( 622kcd!!) , D25Cvn ti, Mm15vn, V11rvn, V25cvn, C20cvn, S200c2vn, convoy m1 xml2 3a X2 , convoy c8, Tcr10vn, Tcr2vn VIP, X60vn V2, Hc90vn , Mh25, K40mvn (mtg2),Sd6vn, Pd35vn (xpl triple) Sinner titanium xml2
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