Abstract

By coupling a cw GaAlAs-diode laser to an external resonator with Fabry–Perot etalons as dispersive elements, emission was reduced to a single-axial mode of 32-MHz width. The wavelength could be coarsely tuned over a spectral range of over 10 nm. Fine tuning over about 500 MHz was achieved by varying the external cavity length by less than λ/3. At single-axial-mode operation, the commonly observed high- and low-frequency self-pulsing of the light output was found to disappear almost completely.

© 1977 Optical Society of America

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