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Old 03-14-2015, 04:34 AM #1
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Default Missing Lens?

I have had this laser for like a couple years, and today when I took it out to use the lens seemed out of focus. I adjusted it too far out and the assembly fell out in pieces. I dont remember if there was another lens, but it will not focus to a dot anymore. If I unscrew the lens and hold it like 1/8 inch from the housing it will focus but it also burns fingers :P can anyone tell if I am missing something by my pic?
not sure if it matters, but it is a 1.4w blue laser bought from someone here around 2 years ago.
Thanks,
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Old 03-14-2015, 05:05 AM #2
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Default Re: Missing Lens?

Yea, you are missing a lens. That's a 3-element glass lens, and they can be had for cheap: https://sites.google.com/site/dtrlpf/home/glass-lenses
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Old 03-14-2015, 05:37 AM #3
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Default Re: Missing Lens?

thanks a ton! i looked everywhere for the missing pieces. so for a blue laser I would imagine I would order the 400-500nm package?
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Old 03-14-2015, 07:59 AM #4
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Default Re: Missing Lens?

Yup, order the 400-500nm package. If you want a higher output, order a G2 lens or G9 lens

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Old 03-14-2015, 09:16 AM #5
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Default Re: Missing Lens?

Im not sure you are actually missing a lens. Yes it is called a 3 element but there are physically only 2 pieces of glass! One of the pieces normally has 2 lenses glued to one another hence 3 element.

Hold the thicker piece up to the light and check if it is actually 2 separate pieces. If it is, just reassemble in the opposite order and it should work. Dont forget the spacer.

If you dont remember how to put it back together let me know and I will take one apart and check for you.
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Old 03-14-2015, 09:31 AM #6
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Default Re: Missing Lens?

all i have is the "thick" piece. It has convex surfaces on each end. I dont remember if there was another glass piece that went in the tube as well, if so it is gone.. I tried to reverse the thick part and I put the spacer in first and also tried the spacer in last, same result each time. I will keep messing with it, but I ordered the lens above, so we will see when it gets here I guess lol
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Old 03-14-2015, 09:47 AM #7
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Default Re: Missing Lens?

Just wondering, is your laser diode multi-mode? Post a photo of the beam, focus to the best you can.

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Old 03-14-2015, 10:27 AM #8
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Default Re: Missing Lens?

You should only have 2 pieces of glass, one spacer and one retaining ring. The 3 element fits into the laser (ie towards the diode) retaining ring end first.
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Old 03-14-2015, 03:18 PM #9
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Default Re: Missing Lens?

I found the same thing happened to me. I pulled mine out to use today and all it does is produce a rectangle image that I cannot change. Is there another small lens that is supposed to fit inside the center adjustable ring (that I somehow lost?) If so how/where do I find a replacement?
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Old 03-15-2015, 03:50 AM #10
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Default Re: Missing Lens?

Quote:
Originally Posted by Bombdigity View Post
I found the same thing happened to me. I pulled mine out to use today and all it does is produce a rectangle image that I cannot change. Is there another small lens that is supposed to fit inside the center adjustable ring (that I somehow lost?) If so how/where do I find a replacement?
the rectangle image might be due to the multi-mode diode the laser uses
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Old 03-15-2015, 05:02 PM #11
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Default Re: Missing Lens?

The small brass looking ring that I use to adjust the beam: should it have a lens inside? otherwise what am I adjusting? There is nothing here but a ring.on my 501B
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Old 03-16-2015, 03:22 PM #12
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Default Re: Missing Lens?

Ok...I'm officially an idiot. Appears after a closer look and thinking about it... The focus ring was loose. Thats all! Thanks anyway everyone.
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Old 03-17-2015, 04:25 PM #13
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Default Re: Missing Lens?

Here you go. Hopefully it will help!

3 element lens info!
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100mW 405 PHR
700mW 405

2W 445 C6--link--
+2.3W 445 --link--
+2.5W 445 --link--

190mW 450 --link--
15mW 510nm
5mW 532 --link--
25mW 532 --link--

520mW 638 --link--
1W 638

250mW 650
250mW 780

3000 Lm C8 MTG2 @ 6 A!
Poppas mod 3A --link--
Sipik 98 Cu pill/star mod --link--
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Old 03-20-2015, 07:12 PM #14
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Default Re: Missing Lens?

If it helps.. I ordered a new 3 element lens from https://sites.google.com/site/dtrlpf/home/glass-lenses super cheap .. and it worked like a charm.. actually it seems to be MORE powerful. Were my old lenses possibly plastic or something.. and the glass is better?? whatever the reason YAY!.. Thanks for the help!!
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