Abstract
An investigation was made of a cavity optical parametric oscillator (COPO) utilizing a KDP crystal pumped synchronously with the second harmonic of a picosecond neodymium phosphate glass laser with passive mode locking. A strong discrimination of the time profile of the signal under conditions of gain saturation and group velocity mismatch resulted in generation of subpicosecond pulses (~0.5 psec) in the COPO when the duration of the pump pulses was 3–5 psec. The COPO was tunable in the range 0.82–1.3 μ, the energy efficiency of the conversion process was 2%, and the average energy of a single subpicosecond pulse was 20 μ J. A numerical analysis was made of the transient parametric amplification in the COPO and the subpicosecond COPO was optimized so as to reduce the pulse duration and increase their contrast.
Published Version
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