[Laser] Great deal on narrow band interference filters On Ebay

[Art]

Steve Knoll offered to run some filters for me years ago, not even sure if 
he is on the laser list these days. Anyone with an optics lab will have 
high buck equipment that makes short order of testing filter bandpass.

A wideband light source can be made with a D2 lamp. Add a diffraction 
grating and a detector and you can sweep the entire visible/near IR 
spectrum easily.

Using sunlight and a diffraction grating is even cheaper, although you're 
dependent on the sun and weather to take measurements.

There was mention on the list one time of an easy to modify spectral tester 
that pops up on ebay for 10 to 15 bucks, but I don't remember any of the 
gory details. I think it was a list member who had one of these.

Laser Sam has a section on using a CD as a diffraction grating for 
measuring the output wavelength of lasers.

Regards,

Art



At 09:56 PM 9/7/04, you wrote:
>Kerry, do you have any way to measure the passband on these?  A friend of 
>mine looked into these a while back and apparently some of them aren't 
>blocked well beyond the passband.  That is some of them let in quite a bit 
>of IR--something that is detrimental if you are planing on using Si 
>detectors.  I'll see if I can get some details.
>
>Andy K0SM/2
>
>Kerry Banke wrote:
>
>>
>>You guys are going to think I have a vested interest in Ebay but I don't 
>>:)   I just received email from buyrightauctions indication they have a 
>>large number of optical interference filters on auction. I bought a few 
>>of the 650 nm 10nm narrow band  filters and they are great for use with 
>>650 nm laser pointers and go for about $2.50 each plus shipping. These 
>>are cosmetic rejects but great for experimenting. Look under optical 
>>interference filter or buyrightauctions.
>>  - Kerry N6IZW -
>>
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>
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