Traveling-wave optical parametric amplifier: investigation of its phase-sensitive and phase-insensitive gain response

Sang-Kyung Choi, Ruo-Ding Li, Chonghoon Kim, Prem Kumar

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Abstract

We experimentally investigate the gain response of a frequency-degenerate but polarization-nondegenerate traveling-wave optical parametric amplifier that consists of a type II phase-matched potassium titanyl phosphate crystal pumped by a frequency-doubled Q-switched mode-locked Nd:YAG laser. Both the optical phase-sensitive and phase-insensitive configurations of the parametric amplifier are studied. Experimental results are in excellent agreement with the theory of an optical parametric amplifier when the Gaussian-beam nature of the various fields is taken into account. In the phase-sensitive configuration a gain of >100 (20 dB) could be easily obtained in the amplified quadrature, which is limited only by the available pump power. Because of gain-induced diffraction and phase fluctuations, however, maximum deamplification in the orthogonal quadrature is limited to
Original languageEnglish
Pages (from-to)1564-1575
JournalJournal of the Optical Society of America B
Volume14
DOIs
StatePublished - Jul 1997

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