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A current draw of 172mA dropping to 169mA should have no noticeable effect on brightness. If its running off of a bench ps then battery voltage dropping isn't an issue. It is possible that the lm317 is overheating and entering thermal protection, but at 0.17A thats unlikely. 6 volts may not be...

It is called a brewster prism because the light will enter and exit at the brewsters angle, so it will have 0% theoretical losses for one polarization. No coatings are necessary because of this. As long as linearly polarized light works for your application. I can't say the actual real life %...

As far as I can tell the best option for wavelength selection is using a Brewster prism. This is what is used for tunable argon lasers for example. This way a concave mirror can still be used. Theoretically this setup can have near zero losses at the one specific wavelength. I've been studying...

Sent you a PM. I may be interested in a few mounts and FS mirrors.

That is a nice old HeNe tube. If it works that's a great find, working HeNe's from before 1980 (especially 1977) are rare.

Have you already looked at sam's laser faq? That might help with some specifications. If you can give some pictures that would also help better to identify them. Looks like SP-941 is a HeNe at least.

My first thought is low battery or faulty switch. Welcome to LPF and good luck!

Have you checked if they are single mode? I think one main part of a suitable holography laser is it must be single longitudinal mode, most normal lasers aren't suitable for holography. Some single mode diodes run at lower power, some OPSL's, and Gas lasers are good for holography I think, but...

Welcome to LPF John. Many commonly sold "5mw" laser pointers can frequently be much higher power than they claim, sometimes up to 100mW, so just always use them safely. If you are serious about making Holograms then make sure to read all posts by Eidetical on holograms, as he has a lot of...

Welcome to LPF. Plenty of great information here if you can find it. Have fun and stay safe. (y)

To celebrate having made an account here exactly 10 years ago today, I’m going to do a review of a recently acquired tunable Melles Griot 532 Argon-Ion. Operating principal: The core of the laser is the same as any other external mirror argon, the main difference is the HR has a tuning prism...

Are you specifically looking for dpss 473nm or just 470nm-490nm? DPSS 473nm I would imagine would be difficult to find. There was a very small batch of 475nm diodes, but it would also be hard to find one and might be as much cost as DPSS. Obviously a 488nm diode is going to be the easiest and...

Wish I could give advice, but I haven't done anything with my PCOAM's yet. Les did a good youtube video I think (www.youtube.com/watch?v=iOB8jyYetvw) Have you done any further work since posting?

Good luck on the sale. I have two laserbtb laser, they are decent quality, and it is nice to have a a shutter, key switch, lighted button.

I would be interested to see the exact wavelength of these. These new green-yellow lasers seem to be fairly variable on wavelength.

PM sent. Pictures would definitely be helpful.

I'm not totally understanding your question. Do you mean slowing the speed down to a point where you can observe the difference in speed indirectly or directly? Because of lights fast speed there won't be any way to slow the speed down to a point of it being visible. There are some experiments...

I am surprised you have such a small yellow HeNe. I didn't know they came that small. What is the power for somthinkg tiney like that for a yellow, like 0.1-0.3mW? Would definitely be cool to have a yellow laser pointer.... that is a HeNe too!

Very interesting. Unfortunately it seems there are many inventions that just don't end up making a direct significant difference. How far along the process is it, have they been put in production?

No, but I should have.