Need a calibrated green laser

Hello
I am in need of GREEN laser with a calibrated wavelength
It doesnt have to be powerful. It just needs to have had its wavelength measured accurately ( center wavelength +or- 1nm or better)

This is for a project i am working on, but i really dont want to spend a lot of money.

I was hoping one of you may have access to an accurate spectrometer and could provide me with a calibrated "cheap" green laser.

Failing that, i was wondering if any of you would know how close to being 532nm a run of the mill green laser might be, and if and by what percent, the wavelength changes with increase or decrease in electrical power input power or temperature.

thanks

Try this thread "Map of members with access to laser power meters", some of these members have spectrometers also. Most of these members will check your laser at no charge.

As far as I know DPSS wavelengths never change wavelengths? 532nm will always be 532nm, nothing else.

-Alex

I agree, go with the dpss route and you've got it

Hap said:

As far as I know DPSS wavelengths never change wavelengths? 532nm will always be 532nm, nothing else.

-Alex

Click to expand...

jors said:

I agree, go with the dpss route and you've got it

Click to expand...

You are both correct. You want DPSS.

What project are you working on? We might be able to recommend something more specific if we have more information!

Thanks guys !
I was thinking as much, but wasn't absolutely sure.

I work in the cinema industry as a technician. We use one of these color meters (USL PCA 100)

Video Only

to set up digital projector chromatic values. I dropped it the other day, and although it still "works", i fear it may be out of calibration. There was also something rattling, which, when i opened it up, turned out to be just a loose eyepiece retical...easy to fix.

The PCA 100 is a repacked Ocean Optics "USB2000" spectrometer.

USB2000+RAD - Ocean Optics

It is fairly expensive to send out and have recalibrated. So i was looking for a cheap accurate wavelength source to do a quick check to see if it is necessary to have it recalibrated or not.

thanks again...ill give a green DPSS a try and let you all know how it goes

Hi Guys
So i had some time to check the wavelength of 3 different Green lasers.
After averaging a few readings each, i got the following peak wavelengths:

Green #1 532.4
Green #2 532.8
Green #3 532.9

It seems the PCA100 is off a little and will need calibration afterall

Again, thanks for you help

It may display more decimal places, but it doesn't mean it is accurate to them. I've got a spectrometer with almost identical specs. The best you can hope for is +/-0.5nm. I don't see a spec for accuracy, but I'd probably give the spec to be within 1 or 2nm, given the resolution is 2nm. Of course, equipment can usually do better than its spec. You could recalibrate it, but I'd say it's close enough for what it is.