A working HeNe tube is shown below running at 2 kV with a 330 kohm resistor. It takes about 3 – 4 kV to trigger. It is shown firing through a 15,000 lines per inch diffraction grating and shows the first order spectra.
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The SSY1 laser was used as a range-finder laser on an M1 tank as I understand.
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Argon Laser 40 mW Blue Laser, multi-line. Unusual in that it has multiple spectral lines. Of course these days, simple handheld diode lasers can be much brighter than this. The power supply and control unit are on the left and the head unit with fan on top. The beam is highlighted by a water spray. I love electronics with a key start.
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A Blu-ray violet laser is made up into a hand held unit.
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This green laser pointer from 2010 above is a class IIIa 532 nm diode laser rated at 5 mW and is legal in the USA.
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