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Old 07-07-2013, 05:41 AM #1
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Default 635 Lens Mystery

So I have searched the forums to solve this mystery but I haven't found any explanations.

I have a build using a Mits 500 diode, with the current set at around 1025mA. Using a G2 lens, I get an output of roughly 730mW. This seems average for the diode from what I'm reading.

So here is where the problem comes in, I put in a glass lens coated for the 635nm and I get a reading of 500mW. This comes out to a 46% increase, and 500mW seems low for this.

Is this normal? I have tried another glass lens, same reading, just around 500mW.

Shouldn't this a G2 only give me like a 20% increase? My LPM is fairly new, a LaserBee bought calibrated. Also when testing some of my other lasers, I'm getting correct readings, and the expected percent increases between lenses (with my 450nm lasers).

Any help would be appreciated!


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Old 07-07-2013, 12:33 PM #2
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Default Re: 635 Lens Mystery

G2s often give up to between 20 - 30 % more power with a 445. It will be different for different wavelengths and lens AR coatings. Perhaps the G2's coating works better across the visible, whereas the 3 eles you have, might be coated only for 405? I know you can use G2's for reds, but you cant use 405 coated lenses for them, so it would seem plausible.
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Old 07-11-2013, 01:38 AM #3
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Default Re: 635 Lens Mystery

I can tell you I get about a 55% increase from a 635-660nm coated 3 ele lens to a g2 as well. Tested using 2 635-660 aixiz lens. So I'd assume its normal.
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Old 07-11-2013, 02:13 AM #4
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Default Re: 635 Lens Mystery

Awesome thanks! Was just making sure this is normal
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