laser wavelength change?

well it looks like i finaly got a little somethin! i took these photos (2 each) of the normal color and the color after the change... surprisingly, the bluish color again happened when my batteries already had some good use... i used a GE C1033 camera.

NOT EDITED!

Holy sh*t, this MUST be measured on a spectrometer.

Do you have any other green lasers to compare it side by side?
What's the voltage of the battery when this occurs? Also, what battery are you using?

D: That's epic!

Blade said:

well it looks like i finaly got a little somethin! i took these photos (2 each) of the normal color and the color after the change... surprisingly, the bluish color again happened when my batteries already had some good use... i used a GE C1033 camera.

NOT EDITED!

Click to expand...

Have you considered posting this on Photonlexicon or Discussions - alt.lasers | Google Groups ?

Eudaimonium said:

Besides, you can't even be sure what crystal exactly is in the laser.

Click to expand...

You may be able to infer something about the actual gain medium in green DPSSFD sometimes, by checking the polarity of the final resulting beam. ;-)

Just subscribing, here. Very interested to see what this does when it shines through a diffraction grating. In the meantime, I'd suggest you try to document everything you can; battery voltage, temperature of the laser, room temperature, mean run-time between charging until the blue shows up, that sort of thing. If that's too much or beyond your means, that's fine. Thanks for sharing this little phenomenon with us. Just when I think I have things pretty well nailed down, someone's laser goes and surprises me!

im gonna get back to this but ive been getting pounded with school stuff and i have almost no time... i hope to be back tomorrow to check things out a little more...

so i was messing with my laser yesterday and i decided to shine it through a prism... nothing... i havent had any change of any sort. and i wish i did have another greenie to compare it to, but i plan on getting one soon (idk how soon). but until then i have nothing elso to show. i'll post some pics if i get any results. but i have to get some more money and equipment in order to continue with this...

well i got kinda tired of this laser so i sent it back for an exchange. it started to mode hop more than ever and it just seemed like it was about to totally die out. so, this laser was interesting while it lasted, but im not gonna let $200 go to waste... maybe i'll get a good one this time...

Today I received my SD301 100mw 532nm laser from DealExtreme (no longer sold there) and to my surprise it's color is different from all 3 green lasers I have.

It's only noticeable when focused to project a 10cm or larger circle on a white wall. It seems to have a slight "warm" shade on the outer (less bright) parts of the circle, like it has a yellow or red component in addition to the green one.

At first I thought it could be a strong 808nm leak but then again an enormous IR power would be needed for that to be visible.

I've asked 3 other people, 2 noticed the odd color and 1 didn't.
My camera saturates way too much to capture it, unfortunately.
Is there any experiment I can try to figure out what's happening?

shine Your green lasers at a diffraction grating in the same spot. A diffraction grating diffracts light at a certain angle, but the angle is different depending on the wavelength, so the distance between two dots produced by a diffraction grating at a constant distance from the grating will always be the same distance apart unless the wavelength is different.

That wasn't confusing.... Maybe if I describe what I'd do...

Ok, so, take a diffraction grating and mount it a certain distance from the wall (i.e. put it on a table and make sure it doesn't move). The larger the distance to the wall, the easier it will be to measure a difference.

Now, you need to find a way to make sure you are shining each laser at the same spot on the difraction grating, at the same angle. For this, you can use a piece of tape to mark at what angle and where you set the laser down at, or you can think of a more precise way of doing this.

From there, shine each of your lasers through the grating and measure the distance between a set of dots on the wall. Do this for all three of your green lasers, using the same two dots for measurements for each one.

One of these laser's measurements will be different if the laser is a different wavelength.

Can I use any of those "stars" gratings or does it have to be a specific type?

Atomicrox said:

Can I use any of those "stars" gratings or does it have to be a specific type?

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i never tried this, but i believe you might be able to use a prism. (just another alternative maybe)

BTW i recieved my replacement laser not too long ago and its way more stable than the other :wave:

what did you do with your 'sometimes ~500nm' one?

He said he returned it back to o-like for an exchange coz it was modehopping or something

just look at the tags and all will be explained :drool::tsk::crackup: