Old 10-13-2009, 12:43 PM #1
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Default 405nm AR coated collimation lens

can I use 405nm AR coated collimation lens for red and green laser diode?


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Old 10-13-2009, 04:39 PM #2
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Default Re: 405nm AR coated collimation lens

Yes, but you will not get the lenses AR attributes effecting those wavelengths. It's best to get a lens designed for the wavelength you intend to use it on, or one that covers a range of wavelengths (again the ones you intend to use it on).
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Old 10-13-2009, 05:16 PM #3
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Default Re: 405nm AR coated collimation lens

No. using a 405nm (violet) coated lens will result in unacceptable power loss at other wavelengths like red or green.
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Old 10-13-2009, 05:39 PM #4
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Wink Re: 405nm AR coated collimation lens

^ other than this, green modules (cause i suppose you are speaking about DPSS modules, for green, and not pure diodes) have lenses with focal lenghts from 6 to 15mm, depending from the expander ..... a short 2 or 3mm FL for a green module is almost unhelpful, focusing it can become a nightmare
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Old 10-14-2009, 06:48 PM #5
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Default Re: 405nm AR coated collimation lens

the 405-g1 lens doesnt lose much with red at all!
the virtualvillage one is 5% better than stock aixiz, the 405-g1 is 5% better than the virtualvillage, and the red-coated meredith is only a few % better than the 405 one!
the 405-g1 is the one with the shortest focus available, so i chose it for my red built too. a few percent lost, but much higher powerdensity from the thinner beam.. worth for me, ymmw!

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Old 10-16-2009, 05:29 AM #6
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Default Re: 405nm AR coated collimation lens

Sean;

It depends on the type of AR coating on the lens.

I have Hi-Power lenses coated for 405nm and

the same lens coated for 400 to 800nm.

The first lens will work well for 532nm lasers.

It will even work for Red lasers with the loss of a few percent.

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Old 10-16-2009, 03:33 PM #7
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Default Re: 405nm AR coated collimation lens

Larry,

You're correct, though for optimal results an AR coated lens that includes the frequency being used is needed (you did mention that though). Others will work, and a few percent is probably not a big deal for the general hobyist. Just wanted to point out that there will be a difference, even if it is small.

Btw, I've looked at your projects, you do some fine work.
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