[ATM] LED source? \ Re: TDE on a 6f6 mirror

[David Weinshenker <daze39@earthlink.net>]

Mike Lockwood wrote:
> About this time someone will ask if the blue LED provides more 
> accurate test results because the wavelength is shorter, and of course 
> the answer is no because the accuracy depends on the geometric 
> placement of the knife edge.

Speaking of LED's, do they form a useful illuminant for testing
mating surfaces with interference fringes, or is something more
specifically monochromatic required for that to work properly?

-dave w
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