Abstract
Phase mismatch by angular detuning permits continuous variation of the intensity of second-harmonic light generated in a nonlinear crystal while maintaining a controlled phase relationship between the first and second harmonics. Interference of this second-harmonic light with second-harmonic light generated in a second crystal was measured and can be understood by taking beam walk-off into account. When the second crystal is replaced by a fiber, the phase of the χ(2) grating in the fiber is measured to be 88 ± 4°, which differs by 180° from recently reported results.
© 1991 Optical Society of America
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