"Walk" both of the mirrors instead of just peaking the rear mirror. Instructions on the concept are in the Laser FAQ. Also play with your adjustable magnetic field. Amount of field contributes to the red/yellow balance, unless you have the optics that only support the 576 nm yellow. (568n yellowish line /647 red share the same upper atomic level, and mag field and pressure determines the lower level.) 530 nm Krypton line is also field sensitive.
Slight changes in tilt on mirrors that have 80 layers like that result in strong changes in spectrum.
Steve
Qui habet Christos, habet Vitam!
I should have rented the space under my name for advertising.
When I still could have...