QUSTIONS ABOUT shg IN INFRARED

I LOVE finding out about different ways to appreciate the Sun and light in general. Use this forum to post your info or questions about various outside the mainstream ways to appreciate our life giving star!
Post Reply
highfnum
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1234
Joined: Sat Nov 24, 2012 2:33 pm

QUSTIONS ABOUT shg IN INFRARED

Post by highfnum » Fri Aug 28, 2015 7:13 pm

1)is there near IR lines that make a good SHG target?
2) how do you identify them ?

User avatar
Spectral Joe
Ohhhhhh My!
Ohhhhhh My!
Posts: 118
Joined: Wed Mar 14, 2012 4:34 am
Location: Livermore, California

Re: QUSTIONS ABOUT shg IN INFRARED

Post by Spectral Joe » Fri Aug 28, 2015 9:25 pm

CaII at 8542 and, if your optics and camera can support it, HeI at 10830. CaII is usually easy.

How to identify them? That was discussed here: http://solarchat.natca.net/viewtopic.php?f=8&t=17192

If you're going to do this sort of thing then a calibrated wavelength scale of some sort is essential. Normally the instrument is optimized on something easy like Ha before venturing out into the invisible. As an aside, the performance of some lenses deteriorates faster in the IR direction than the UV, so don't be surprised if things look bad there. Refocusing will be needed at any rate, as it is when going from Ha to Ca H or K
Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!

highfnum
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1234
Joined: Sat Nov 24, 2012 2:33 pm

Re: QUSTIONS ABOUT shg IN INFRARED

Post by highfnum » Fri Aug 28, 2015 11:25 pm

thx
BTW saw pictures of your rig -- real nice
when was last time you used as a visual instrument

User avatar
Spectral Joe
Ohhhhhh My!
Ohhhhhh My!
Posts: 118
Joined: Wed Mar 14, 2012 4:34 am
Location: Livermore, California

Re: QUSTIONS ABOUT shg IN INFRARED

Post by Spectral Joe » Sat Aug 29, 2015 1:05 am

My last visual instrument was a folded design in 2009, just for old times sake. It was everything I remembered a shs to be, and thus didn't distract me from the digital approach.
Observing the Sun with complex optical systems since 1966, and still haven't burned, melted or damaged anything.
Not blind yet, either!
Light pollution? I only observe the Sun, magnitude -26.74. Pollute that!

highfnum
Way More Fun to Share It!!
Way More Fun to Share It!!
Posts: 1234
Joined: Sat Nov 24, 2012 2:33 pm

Re: QUSTIONS ABOUT shg IN INFRARED

Post by highfnum » Sat Aug 29, 2015 12:55 pm

I get the feeling from your reply that method is better suited for images(grams) than visual

Wah
Im an EXPERT!
Im an EXPERT!
Posts: 339
Joined: Tue May 01, 2012 2:14 am

Re: QUSTIONS ABOUT shg IN INFRARED

Post by Wah » Sat Aug 29, 2015 2:07 pm

I really hope I can have chance to see through a shs in future.

Post Reply

Who is online

Users browsing this forum: No registered users and 2 guests