Abstract

ABSTRACT Phase mismatch by angular detuning of a nonlinear crystal allows continuous variation of the intensity of second-harmonic light generated in the crystal, while maintaining a controlled phase relationship between the first and secondharmonics. Interference of this second-harmonic light with second-harmonic light generated in another crystal furtheralong the beam path has been measured, and can be understood by taking beam walk-off into account. When thesecond crystal is replaced by an optical fiber prepared for second-harmonic generation, the observed interferenceallows one to determine the phase of the grating in the optical fiber. We find the phase to be 88 4°. This phase differs by 1800 from recently reported results. 2. INTRODUCTION AND THEORY Interferometry of second-harmonic (Sil) light generated by two frequency doublers in series driven by a commonpump beam has proven to be a useful probe of second-harmonic-generation (SHG) physics'6. The use of multiplecrystals7 or of round-trip propagation through a single crystal8 has also been investigated as a means to increasethe efficiency of SHG. This type of interferometry was first used by Margulis e al.' to study SHG in fibers. They

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