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Effect of stimulated Raman scattering and pulse walkoff on self-phase modulation in fibers

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Abstract

Compression of the relatively long pulses from actively mode-locked Nd:YAG lasers can be especially effective, with single-stage compression ratios approaching one hundred.1·2 Stimulated Raman scattering (SRS) in the fiber not only limits the optical intensity but also distorts the spectral broadening essential for pulse compression. In this paper we investigate the effect of SRS on the 1.06-μm pump pulse. The growth of the Stokes pulse and its subsequent walkoff is discussed elsewhere.3 We show here that strong SRS causes a reshaping of the pump pulse early in the fiber and that this reshaping leads to a nonsymmetric self-phase-modulation spectrum. Such reshaping and nonsymmetric spectral broadening reduces the effectiveness of subsequent pulse compression, in terms of pulse width as well as pulse quality.

© 1986 Optical Society of America

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