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infrared question

Posted: Sat Dec 19, 2015 2:31 pm
by highfnum
I'm now using visual grating for SHG
I notice that IR region seems limited
I notice that soon after red region
there is a dark area followed by another spectrum
I assume that is secondary

1) how far in IR does a visual grating reach
2) do any of you guys use gold IR grating - any need or use for this
30 anything interesting in IR and anyone do any pics?