20mW 561nm Beam Photos

[frothychimp]

Here's an unusual wavelength, it's a 561nm DPSS laser rated at 20mW. It's outputting just over 43mW. The power stability is fantastic (<1%) considering it requires 1.2A across the pump diode junction to output 43mW at 561nm. It runs TEM00 and is a beautiful yellow/green. This wavelength is being evaluated for a DNA sequencer system under development.

Output with no smoke:



Output with a bit of smoke in the air:



Beam Shot:



Expanded Beam:



Expanded Beam Spot:

[daedal]

WOW That is a beautiful color! Thanx for sharing!!

Which of the colors in the last picture represents the true color of the output?

Thanx;
DDL

[frothychimp]

WOW That is a beautiful color! Thanx for sharing!!

Which of the colors in the last picture represents the true color of the output?

Thanx;
DDL

None of them really. The camera is trying to compensate for the intensity of the spot so you see white in the center surrounded by yellow then green. To my eye I see a nice interference pattern (because there is a vertical scratch on the expanding lens) that is consistent across the spot. The color of the beam is a very good representation of the color as the camera seems to capture that quite well.

[ElektroFreak]

Beautiful! Looks like a CNI unit. Is it?

[daedal]

None of them really. The camera is trying to compensate for the intensity of the spot so you see white in the center surrounded by yellow then green. To my eye I see a nice interference pattern (because there is a vertical scratch on the expanding lens) that is consistent across the spot. The color of the beam is a very good representation of the color as the camera seems to capture that quite well.

I was basing my color comment on the beam photo... That looks "561-ish" enough to me here

Thanx for the reply though

Beautiful! Looks like a CNI unit. Is it?

I think CNI is most probably the most affordable producer of reliable 561nm lasers... right? It has to be CNI... How much does one of these run (to a CNI customer, not a FrothyChimp customer )?

--DDL

[Doc]

Just add blue for white light, nice.

[shrad]

wow, really nice! I'd call that color golden green!

is the expanded beam spot an image of the beam profile, or is it only an artefact due to the saturation?

this is really gorgeous!

[frothychimp]

wow, really nice! I'd call that color golden green!

is the expanded beam spot an image of the beam profile, or is it only an artefact due to the saturation?

this is really gorgeous!

It's really a function of both. Because it's TEM00 the greatest intensity is in the center of the beam. The camera indicates this with an intensity representation of white. The other colors represent lesser degrees of intensity. The camera cannot distinguish, however, between very many degrees of intensity because the CCD is saturated. A beam profiler has an ND filter and is designed for differentiation but what my camera is seeing can be construed as the poor man's profiler.

[frothychimp]

I was basing my color comment on the beam photo... That looks "561-ish" enough to me here

Thanx for the reply though



I think CNI is most probably the most affordable producer of reliable 561nm lasers... right? It has to be CNI... How much does one of these run (to a CNI customer, not a FrothyChimp customer )?

--DDL

It is indeed a CNI system. I cannot say what it would cost as our pricing is significantly different than if you called up and ordered one. We sell a dollar volume in the six figure range per year which helps. Furthermore, we have some additional engineering added to our systems because of the nature of what our clients use them for. Essentially CNI manufactures a semi-custom product for us.

EDIT:

Oh and I forgot to tell you, I'll be videoing a 200mW 561nm in a few weeks. Next week I've got the 10W 532nm system to video and after Labor Day, I'll be doing a 150mW 593.5nm system.