Single-Pulse Time-Resolved Comparative Study on the Performance of a MasterOscillator, Power-Amplifier Copper-Vapor-Laser System with Generalized DiffractionFiltered and Unstable Resonators as Master Oscillators

We present results of comparative time-resolved coherence studies on a single pulse from a master oscillator power amplifier (MOPA) copper vapor laser with generalized diffraction-filtered and unstable resonators as master oscillators. It is shown that, unlike the conventionally used unstable-resonator MOPA reported in literature, the coherence of a generalized diffraction-filtered resonator MOPA pulse is fairly independent of the delay between the oscillator and the amplifier. It also remains constant throughout the pulse, with the result that the flux is constant over a large range of the delay.