Today, 09:44
Laserium shows began at Griffith Park's planetarium in 1972. I 'experienced' my 1st in 1977, before becoming a laserist the following year.
The RYGB laser was a Spectra Physics krypton 164, with broadband optics and optimized gas pressure to produce the 4 distinct colors.
Initially, the 4 X/Y...