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Abstract

A laser system in which the gain medium is an excited YAP:Nd crystal. The system is configured so that the crystal produces a twin laser beam comprising wavelengths at both 1079 nm and 1340 nm with substantial intensities at each wavelength. Optical components are described which establish the desired ratio of the intensities of the light at each of the two wavelengths. These ratios, I.sub.1079 nm /I.sub.1340 nm, may vary from about 0.1 to 10. In a preferred embodiment of the invention a kit including a YAP:Nd crystal and a specially coated output coupler is provided for converting an existing Nd:YAG laser system to a twin light laser capable of producing the above described twin laser beam. In another embodiment a special combination output coupler is provided which contains at least three partially reflecting mirror elements, one coated to reflect a substantial fraction of light at 1079 nm and pass light at 1340 nm, another mirror coated to reflect a substantial fraction of light at 1340 nm and pass light at 1079 nm and a third mirror coated to reflect a substantial fraction of light at both wavelengths.

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First Claim