Second harmonic generating method and apparatus

Abstract

A second harmonic generator for generating a stable harmonic includes an input mirror and an output mirror for providing a resonating section which is optically confined, second harmonic generation elements for generating a second harmonic using an externally applied pumping energy, and a casing for supporting the optical components. A temperature regulating device for mode selection is provided under the nonlinear birefringent crystalline device. A temperature correction device is provided in the peripheral surface of the casing for correcting the temperature of the casing. A controller senses the temperature of the casing and maintains the sensed temperature within a preset temperature range. Such a structure can generate a stable harmonic output even with large changes in ambient temperature. Particularly, the desired light output can be obtained within a short time.

Dependencies are inferred from the claim text.