Abstract

The dependence of the optical second-harmonic generation (SHG) in a negatively birefringent crystal on the crystal double-refraction angle, the beam divergence, and the diffraction of the focused high-order transverse mode is discussed. Within constant-pump approximation, the SHG efficiency for the TEM11 mode is only one seventh that for the fundamental TEM00 mode and does not increase with the crystal length. Parametric wave mixing of lower-and upper-sideband waves associated with frequency doubling can give a rather high efficiency for the SHG of a broadband laser. As calculated on an example of LiNbO3 crystal, the spectrum linewidth decreases and the acceptance angle for phase matching increases as the fundamental mode number increases.

© 1987 Optical Society of America

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