We propose a new tunable linear laser oscillator–amplifier system that incorporates a Fizeau wedge with unequal mirrors as the coupler. Because of asymmetry in reflection and wedge focusing in unequal mirrors, our system acts as a highly efficient selector in the oscillator and practically eliminates reinjection of spontaneous emission in the amplifier. We studied the wedge action by developing a procedure for the calculation of reflected interference patterns at a distance from the wedge. Using this procedure we found the feedback factors for both the oscillator and the amplifier. Background emission levels of less than 1% of the peak intensity in the emitted line were experimentally obtained.
© 2001 Optical Society of America
(100.2650) Image processing : Fringe analysis
(140.3280) Lasers and laser optics : Laser amplifiers
(140.4780) Lasers and laser optics : Optical resonators
(260.3160) Physical optics : Interference
Elena V. Stoykova and Marin N. Nenchev, "Fizeau Wedge with Unequal Mirrors for Spectral Control and Coupling in a Linear Laser Oscillator-Amplifier System," Appl. Opt. 40, 5402-5412 (2001)