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Noise properties of quasi-phase-matched second-harmonic radiation pumped by a laser diode with a grating feedback

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Abstract

The noise properties of quasi-phase-matched second-harmonic radiation with a grating feedback are studied for three different optical configurations. In multimode operation at a relatively low feedback rate from the grating to the laser diode the relative intensity noise for second-harmonic radiation is large. In single-mode operation at a high feedback rate it can be reduced to less than −130 dB/Hz. The critical value of feedback rate for the single-mode operation is the least, ∼8%, in the self-phase-matched configuration. The mechanism of second-harmonic noise under the multimode operation and the differences in the noise properties for these three configurations are also discussed.

© 1996 Optical Society of America

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