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Ali Javan passed away last Monday aged 89. Dr. Javan was professor of physics at the Massachusetts Institute of Technology. A native of Iran, later a U.S. citizen, he received a Ph.D. in physics from Columbia University in 1954. While a member of the technical staff of the Bell Telephone...

What is the minimum tube length we need that would still support lasing, if we only know that the maximum gain coefficient of the gas medium is, say 0.5 m^-1? I've never seen a commercially available gas laser smaller than ~4-5" in length. But I did some calculation that turns out to be such an...

I've got this HeNe power supply that runs off the mains. But the problem is it takes 115 Vac (designed for the US mains where you have 120 volts). Here in the southern hemisphere electricity is distributed as 50 Hz ac at ~230 V. I think the psu has some kind of rectifier to get dc, and then...

Hi guys! I am having a lot of trouble finding the correct power supply for this laser. It's a uniphase 8.5" red HeNe tube as seen in the pic below. According to the seller the operating current is 6.5 mA and the operating voltage is 1300 V (and maximum starting voltage is 10 KV DC). Does...

Hi guys, I want to purchase a handheld portable 473 nm laser pointer, less than $300 and preferably >10 mW. So, what is the cheapest 473 nm pointer around? I looked at CNI, but the prices were too high for my budget (the cheapest was $500). And if I want to make a 473 nm DIY, I need all the...

I’m looking for a safety goggles that I can use for both 445 blue AND 635nm red/orange. Most people in the forums seem to recommend the Eagle Pair goggles so I found this: Eagle Pair® 190-470nm & 660-760nm Laser Safety Goggles It says these glasses "have an OD of 2.5 at the 635nm" (as opposed...

Hi guys! I'm new to these forums so I say hi before I make my post. I want to set up a laser with a pink/magenta beam, and I have a few questions which I think was not addressed in other threads. So to make such a beam I have to combine red with either blue (445-450 nm) or violet (405 nm) at...