Abstract

Subwavelength variation in the length of an external cavity strongly coupled to a very short (100 μm) dye laser results in large changes in the total intensity and frequency hopping of the lasing modes. These measurements are in agreement with a multimode theory of coupled-cavity laser dynamics. The modulation in the total intensity is due to the frequency-dependent gain associated with the coupled-cavity mode structure, while the mode hopping characteristics can be attributed to frequency-dependent losses caused by very weak (~10⁻³) reflections or diffuse scattering from the glass surfaces in the system.

© 1994 Optical Society of America

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