- Feb 22, 2008
Wow :drool:, I am very impressed LaserBuilder. The fact you managed to get the 578nm line going as well. Good job, +rep from me. :beer:
As far as I understand it's not particularly hard getting the 578nm lasing too. The large bore diameter and high gain of copper vapor lends itself well to easy alignment. You can even get these lasing without an OC mirror, or sometimes no mirrors at all.
This used a 2.5 cm diameter quartz tube in a standard lab oven, 30 cm long active region. The rest of the tube was constructed of Pyrex using standard quartz-to-Pyrex transition seals (usually rings of 6 different glasses in series) with Pyrex stems and tubular aluminum electrodes. Like the first desgin the cavity used planar mirrors and they were 1 meter apart. Both lines lased with 1.5 mR divergence, the beam diameter being limited to 1.2 cm by the Brewster windows. It would lase superradiantly without the mirrors. The rep rate was 30 Hz using an EG&G 1802 thyratron and a 0.2 uF cap on the dissociation side and a triggered spark gap and .012 uF cap on the lasing side. No details of the spark gap are given. Both sides charge through 1M ohm resistors and the 4 uH inductor is absent. Minimum voltage for the disassociation pulse is 7 KV and lasing is a 24 ns pulse, lengthened by gain passes between the mirrors. The optimal firing delay is 200 us. This laser operated at a temperature 550 °C using CuI.
Still impressive of course!