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Old 09-26-2010, 03:50 PM #1
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Exclamation IR filter query

Hi guys

Some of you may have read the problems ive had a with a 350mW rayfoss laser putting out lots of IR and not much 532nm , Rayfoss's "engineers" requested the specs of the IR filter i used saying it cut too much green, from what i can see from the datasheet (see attachment) it has a good 532nm pass rate. Could some of the vets with optical experience have a nose at the datasheet and see if its ok?

Cheers.
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File Type: pdf IR Cut Filter infosheet.pdf (402.9 KB, 187 views)


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Old 09-26-2010, 04:09 PM #2
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Default Re: IR filter query

It will transmit 93.33-93.57% 532nm and block 99.78% 808nm and it's AR coated for 420-620nm so this filter is actually pretty good
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Old 09-26-2010, 04:26 PM #3
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Default Re: IR filter query

Thanks, thats what i was thinking
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Old 09-26-2010, 04:28 PM #4
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Default Re: IR filter query

Quote:
Originally Posted by pHeneX View Post
It will transmit 93.33-93.57% 532nm and block 99.78% 808nm and it's AR coated for 420-620nm so this filter is actually pretty good
Yes, I agree.
It's a good filter for blocking IR and passing 532nm.
When the filter is in place, take a power reading and divide that number by 0.93 and you will have the actual 532nm output power of the laser.

You can then subtract this number from the unfiltered output power eading to get the IR emission amount.
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Old 09-26-2010, 04:31 PM #5
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Default Re: IR filter query

Yeah i worked it out, there was OVER 200mw of IR, with only 124mW of 532nm. Disgusting haha.
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