A laser system is disclosed which is capable of selectively generating radiation at two competing wavelength regions. A gas discharge tube is provided which includes krypton as the lasing medium. A primary mirror is mounted at one of the tube. A switchable mirror assembly is mounted at the other end...http://www.google.se/patents/US5426662?utm_source=gb-gplus-sharePatent US5426662 - Laser system selectively operable at two competing wavelengths
