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The Zeroth order beam is almost never under 5 mW. The only way to know is to buy a expensive, accurately calibrated silicon photodiode based laser power meter and then install light feedback on the laser to make sure it never exceeds the design value. Did I mention the law requires it to...

Henes are still in production in at least 7 places I know of.. Not dead yet, and Co2 has literally blossomed.

You may find these pages helpful.. http://hololaser.kwaoo.me/laser/red_diodelasers.html#SLM Steve

Well. I can check them in transmission in a spectrometer and give you the numbers on %T. Pick a long radius for the OC and a near flat for the HR. Steve

Two stage Peltier ordered. Milling machine I have. Vacuum sealing tools I have. Current Feedthroughs I have. Trick will be to keep the heat conducting pastes off the optics, and indium, I have as well. Have to see if my Cryocoolers work. Steve

Krypton Laser dual line OC for the red lines... Will have enough reflectivity to get you going. I just happen to have a box of them. Steve

Here is a bit of fun for you... https://geola.com/product/rgb-lasers/

Nice Chart, wait till you do Vanadate, it will be a major headache with all the extra Raman shifted lines.

I found the attached paper on the web... By accident . So ~ 469 and 471 are also available with enough pump power, tuning, and the right doubling crystal, plus an intracavity etalon for tuning. If you have a spectrometer with enough resolution, you may see faint traces of these lines in a 472...

JB weld is a bad joke when it comes to long term outgassing. . Hysol C1 White or Torrseal is the minimum material used. Even those need a considerable amount of baking, plasma cleaning, and outgassing under vacuum. Most tube manufacturers pay for a custom high grade epoxy mix to their own...

Plasma Glow from the ionized gas. Steve

Ever hear of Spatial Filtering? It takes care of this nicely. You use the laser your correcting to burn the pinhole in situ. Steve

It takes a silly amount of hardware. How many galvo pairs with lenses do you need to cover a sphere? At 60' optical scan angle per pair = lots of hardware. Also the enemy has more flying soldiers then you possibly can target with mechanical scanning, there simply is not time to keep...

A pro would buy a diode collimator, a red diode (DTR lasers) , and a pair of compensator prisms. What you need is explained in this paper, but you may not need so many lenses on the left side. These days we have cheap glass aspheric lenses for that. Watch your eyes, these beams can cause...

CALL REO and get the real specs for the PSU, its easy to install a wrong one, which will be short lived. Also if it is killing PSUs, replace the ballast resistor with a wirewound or metal film resistor of the correct value and wattage. Steve

3.39 u 1.5 u 1.15 u 1.12 u 543 588 (four wave mixing) 594 609 [four wave mixing) 604 612 639 632 650 (raman line) 730 2 more visible four wave mixing. 4 x ir four wave mixing. And some other weak Ir stuff I have not identified yet. I got my hands on a few of Dr Knollenberg's unbelievably...

I suggest single mode diodes from DTR mounted in collimators with glass lenses. Use big aluminum blocks to hold the diodes. Then add gratings for wavelength feedback to make ECDLs. http://redlum.xohp.pagesperso-orange.fr/laser/red_diodelasers.html

JDSU tubes are not glued. The hard seal glass frit, when fired, has the appearance of grey epoxy,. Trust me, JDSU argons use sealing glass frit. Its fused on with an induction heater in a vacuum , from a frit preform made of partially fused frit powder. See attached... Steve

Kaiser: Gain measurements at 543 nm in helium neon laser discharges B S Gray1, I D Latimer1 and S P Spoor1 Published under licence by IOP Publishing Ltd Journal of Physics D: Applied Physics, Volume 29, Number1Citation B S Gray et al 1996 J. Phys. D: Appl. Phys. 29 50 Steve

Don't soak it just yet. I have He3 on order. A former HeNe glassblower is selling me his tank. I have Ne22 on station already. In fact don't soak it at all. Helium does not as readily diffuse through Kovar and 304, the alloys mainly used in REO type construction. It does diffuse rapidly when...