Green HeNe is so afraid of mirror mount it turns yella!!

[GooeyGus]

hhhhmmmmm set up a mount, make it happen again, take pics then Ill believe you...

Here ya go pat, I dug out a mirror mount and snapped pictures so you'd believe me

This isn't even a first surface mirror, just a regular chunk of mirror mounted on a 2-axis mirror mount. It stays yellow for a second or two, then flashes back and fourth between green and yellow, then goes back to yellow for a bit and repeats. I swear when it's 'flickering' between green and yellow, that I saw some red, but it might have been just confusing my eyes due to the colors switching so fast.

Anyway, here are some pictures.











I love laser experiments.

[daedal]

Guess I'll give it a shot then... lol... really cool though!

--DDL

[Lasernerd]

Here ya go pat, I dug out a mirror mount and snapped pictures so you'd believe me

This isn't even a first surface mirror, just a regular chunk of mirror mounted on a 2-axis mirror mount. It stays yellow for a second or two, then flashes back and fourth between green and yellow, then goes back to yellow for a bit and repeats. I swear when it's 'flickering' between green and yellow, that I saw some red, but it might have been just confusing my eyes due to the colors switching so fast.

Anyway, here are some pictures.











I love laser experiments.

cool!

[heroic]

The question is, is it lasing red and green, or is it lasing yellow? If you look at it through a diffraction grating, do you still see yellow, or does it disperse?

[GooeyGus]

I'll take off the back and put a diffraction grating on the HR end and see what I can see, but I think it's lasing yellow. I think with mirrors designed to make green, it's pretty easy to get yellow but hard to get the red line to come out, but I could be totally wrong. Also, usually the green stops all together before the yellow comes out

If you look closely in the pictures, you'll see a tiny bit of green, this is because I had to use a long exposure to capture the color, and every time I would get a good picture it would switch back to green right before the exposure finished. The flash would have just killed it.

[allthatwhichis]

I wonder what happens if you use a yellow HeNe...

[GooeyGus]

I wonder what happens if you use a yellow HeNe...

Maybe it will turn green with envy

As a side note, I'm wanting a nice yellow HeNe REALLY badly... so if anyone is looking to get rid of one....

[allthatwhichis]

That's amazing... I am looking for a green HeNe... but to keep my yellow one company.

[GooeyGus]

That's amazing... I am looking for a green HeNe... but to keep my yellow one company.

If only we could clone lasers....

[mixedgas]

try a diff grating at grazing incidence, ie instead of coming in at 90' to the grating surface, reflect the hene waste beam off the grating at a nearly parallel angle, black into the hene.
might be stable enough for you to get tuning.

Steve


Do a google for littrow grating or grazing incidence grating laser diode.