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FrozenGate by Avery

505nm and 480nm diode RESULTS

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You might want to try some 99% isopropanol and a wooden stick cotton swab as they don't use glue to hold the cotton on. Hopefully, the dirt is on the outside of the window and not the inside. Thanks for looking at my builds. :D
 
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Good idea. I am hoping it's easy to get ahold of the 99% isopropanol (rubbing alcohol). I can buy some wood q-tip from medical supplier if I can find out who sell some that's glue-free - if I deem it to be unsatisfactory (I will be testing it on a blank LED flashlight glass I have lying around), I will try optical supply seller.
 
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Cotton swabs from medical supply houses never have glue on them. They are used with too many solutions, so they need to be chemical free.
 
Turns out my 480nm diode is multi line!

At low current it emits a single, lower wavelength line. As current goes up the line stretches up, then it splits into two lines, and if I keep going up the lower line ceases to lase and only the higher line remains. It's difficult to catch, as the two lines only occur simultaneously over a short range of current and they are very close together.
 
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Haven't tried to take a picture, but I think it will show up.
The host is still incomplete and kind of a pain to use right now with exposed wires and unglued parts.
I will attempt to take pictures and run it through my DIY spectroscope after it's finished and fitted with a lens that diminishes the artifact.
 
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Are these multiple beams seen without a diffraction grating? If so, it isn't another line, but a satellite beam most likely at the same wavelength. I've seen this happen with gas lasers sometimes. The only way it would be a different line is if it ONLY shows up with a diffraction grating or on a spectrometer.
 
Mine can only be seen through a diffraction grating. Interesting because the greener line (left) gets stronger as the laser gets warmer, and the bluer line (right) gets dimmer. Same spot after being on for 5 minutes or so
 
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The shape of the spots is very abnormal. I wonder if there isn't something going on with that diode to give you those two odd lines. I have looked at quite a few of these with my Ocean Optics, but never saw anything like that.
 
Mine can also only be seen through a grating and is also skewed/weird (though that might be an artifact of the flexible grating).
 
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The odd shape is an artifact of the flexible grating I have as well. Any recommendations on a non-flexible grating, or one that is made well?

Also - this is from the 485, the PLT5-488. A bit off topic but still
 
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No, I have some gratings on plastic and they don't cause the spot to deform in any way what so ever. That spot that Zach photographed is most likely the diode. It isn't the lens as I have seen the box artifact of single element glass lenses. I would like to put one on my spectrometer to see what the line width looks like.


So, all your laser dots look like this through that grating? Even the ones that are a single line? Otherwise, you can't blame it on the grating. I have a large sheet of 1000 lines/mm and could cut a nice size piece and send it to you. :)
 
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Yes all of them get deformed in a similar way. I'll try taping it down to some clear plastic and see if that has any different result. That'll be tomorrow though, I'm out for the night.

Happy new year guys!
 
I also use a grating cut from a big flexible 1000ln/mm sheet. It distorts most dots, but it's not very obvious with DPSS. I'm unsure if that has to do with divergence or spectral width.

Happy new year to you all!
 
I don't know what to tell you, Jose. My grating does not distort any light it diffracts. The gratings in all my spectrometers doesn't either. It is easier to analyze the individual lines with my USB2000. The other ones probably would work in a similar fashion if I had OEM software for them.
 
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