Some Brewster shots for the Gassy side of LPF

[ultimatekaiser]

Very true. Quartz is a silicate, and does have minor NLO properties...even funner fact....your eye does the same thing at body temperature.

many people that have caught 1064 in the eye have reported seeing a flash of green.

 

[bloompyle]

I'll take the crystal set out of a Newwish pen and test that out real quick.

All joking aside, this has been a good discussion, however I do require rest.

So we'll continue this somewhere else I am sure.

Take care.

 

[Sigurthr]

Bloom there are liquid lenses that can change focal length (or change from Plano-Plano to Plano-convex) when an electric field is applied, I've been wondering if they might be able to replace the AOM in a cavity dump as you're not limited by propagation speed in the piezo medium.

 

[bloompyle]

Bloom there are liquid lenses that can change focal length (or change from Plano-Plano to Plano-convex) when an electric field is applied, I've been wondering if they might be able to replace the AOM in a cavity dump as you're not limited by propagation speed in the piezo medium.

I don't need an optic that changes focal length. I need an optic that flips the polarization of input light, in <5ns.

 

[Sigurthr]

I don't need an optic that changes focal length. I need an optic that flips the polarization of input light, in <5ns.

Why do you need a polarization shift? To cavity dump you just have to bend the beam off axis. You only need to change the polarity if you want to use a polarizing optic to move the beam off axis. If you insert an off center lens in a laser beam it will bend the beam and steer it away. If you could change an off center plano-plano surface to be a lens which would steer the beam wouldn't that also do the trick?

 

[ultimatekaiser]

No because then you end the lasing process because you are steering the light away from the mirrors.

 

[Sigurthr]

That's what normally happens in a cavity dump; you get a large pulse (if you can extract the light fast enough) and then lasing immediately stops until you raise the Q of the resonator again. It's like the opposite of Q switching, instead of holding the medium at a sub-lasing state to build up energy you hold it in a lasing state and then extract the intracavity flux momentarily.

 

[ultimatekaiser]

I know. But this would make it one time. We're talking QCW. Not single pulse. This is a continuous medium. What your talking about would be more for a flashlamp laser I think

 

[bloompyle]

The method I am referring to would result in a single pulse propagating in under 10ns, and repeating this, hundreds of times a second.

Basically, the cavity has inside it, an AO piece that flips the polarity, and a PBS that then spits it out.

In theory, the light is already polarized one way due to the brewster window. The PBS will be aligned to let this light pass. Once the polarity is flipped of all the light in the cavity, it will be fed out of the cavity via the PBS element. Resulting in a pulse of the entire cavity. Once the AO element returns to down position, the light passes normally, back on, polarity flipped, light dumped.

The result is a QCW 50W+ HeNe output perpendicular to the cavity.

 

[ultimatekaiser]

Indeed, the question is more of how much light is lost during the transitions and between the optics? That will determine how much light you actually get out of such a thing.

 

[bloompyle]

I won't know until I source a product.

I also just realized that they are also limited to peak CW input power. One I was looking at was limited to 5W....

 

[Sigurthr]

Ahh, you're looking for high rep rates and perpendicular output! This isn't how the one research paper I found did it, but then they didn't get any major output anyway.

 

[bloompyle]

I know the paper you're referring to. A couple doctors and I believe the research journal was spun up by a younger Asian gentleman. They used a basic PCAOM. This is why they only got such little output. It was a non-b-window AOM, and PCAOMs are very slow.