Nonlinear Optical Parametric Infrared Generation.
Final rept. Feb 93-May 96,
CALIFORNIA UNIV LOS ANGELES DEPT OF ELECTRICAL ENGINEERING
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The synchronously pumped optical parametric oscillator is an efficient, wavelength tunable laser source that makes it possible to generate wavelength tunable picosecond and femtosecond pulses which cover the wavelength range from visible to midinfrared. A theoretical model for calculating the effective gain of parametric generation and amplification of ultrashort optical pulses is presented. An analytical formulation for the parametric efficiency coefficient and the effective gain in terms of six spatial and temporal characteristic lengths is obtained. Also presented is the experimental work to construct such a source based on the additive pulse mode locked NdYLF laser pulses. The design and characteristics of the KTP based picocsecond synchronously pumped optical parametric oscillator are discussed and compared with the previous theoretical work. Efforts to extend the wavelength range to 10 microns by use of a newly developed crystal are included. Parametric generation of femtosecond optical pulses is also presented.
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