[Laser] grating?

[n9jim]

A good cheap source are CD's.
Hold it up on an angle to a light source and you will see the rainbow 
effect created by the diffraction.

I have used them to measure wavelengths of light from various laser 
diodes.  (each wavelength has a different angle)

Jim
N9JIM/6


J. Forster wrote:

>>Zack wrote:
>>
> 
>>I don't know if you got your questions answered.  A diffraction grating is a
>>material with very fine grooves cut in it very close together (on the order of
>>microns), or any pattern of alternating clear and dark lines.
>>
> 
> There are reflection and transmission gratings. Clear and black are the
> transmission type. Reflection type are made either photographically or by ruling
> a series of very fine lines on a reflective surface, aluminum on glass, for
> example. They are typically 150 to 2400 grooves/mm.
> 
> Gratings are used for applications such as monochromators (tunable optical band
> pass filters) and wavelength division multiplexers / demultiplexers.. Basically,
> they use the wave properties of light,  and constructive and destructive
> interference, to deflect an  incident light beam through an angle which is
> dependant on the wavelength of the light.
> 
> John
> 
> _______________________________________________
> Laser mailing list
> Laser@mailman.qth.net
> http://mailman.qth.net/mailman/listinfo/laser
> 
>