Abstract
The green noise in intracavity-doubled Nd:YVO4 lasers can be eliminated by single-mode operation of the device, although good long-term stability remains a problem. We have studied the threshold when multimode operation sets in, with both respect to polarization modes and longitudinal modes, as a function of various cavity parameters. It is demonstrated that the device is sensitive to perturbations in the birefringence and the optical path length of the elements in the cavity. The influence of energy migration and intensity-dependent losses that are due to frequency conversion is also discussed. Good control of the cavity temperature and dimensions is a key point for long-term stability.
© 1994 Optical Society of America
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