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Analysis of high-efficiency pulsed harmonic conversion

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Abstract

An analysis of second harmonic generation is presented with application to the problem of doubling and redoubling Nd laser radiation to 266 nm. This theoretical description is in excellent agreement with earlier experimental measurements in which 85 % internal conversion efficiency was obtained in second harmonic generation from 532 to 266 nm while maintaining good optical quality in the harmonic pulse.1 The analysis demonstrates that at high-conversion levels there is a narrowing of the phase-matching peak, an effect not previously emphasized. This effect places severe restrictions on the tolerances that must be maintained on phase-matching parameters. Information is obtained that allows the selection of optimum parameters in the presence of phase mismatch due to divergence, spectral width, and heating of the crystal and losses due to linear and two-photon absorption. The extent to which the results are scalable to the longer pulse lengths and larger apertures of current interest for inertial confinement fusion experiments2 is considered.

© 1983 Optical Society of America

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