Generation of 22 mW of narrow-band radiation near 430 nm was achieved by frequency doubling the 100-mW output of a single-mode GaAlAs diode laser near 860 nm. A monolithic potassium niobate ring resonator serves as the nonlinear medium and at the same time as a reference cavity for the diode-laser frequency, which optically self-locks to a cavity resonance frequency. Continuous scans of the second-harmonic frequency over 330 MHz are achieved with the electro-optic effect. The results demonstrate a portable, economical, and efficient source of coherent blue light.
© 1994 Optical Society of America
Original Manuscript: September 29, 1992
Revised Manuscript: August 10, 1993
Published: February 20, 1994
A. Hemmerich, C. Zimmermann, and T. W. Hänsch, "Compact source of coherent blue light," Appl. Opt. 33, 988-991 (1994)