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Optica Publishing Group
  • Conference on Lasers and Electro-Optics
  • OSA Technical Digest (Optica Publishing Group, 1992),
  • paper CWG27

Room temperature Er:YAG lasers at 1.64 μm

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Abstract

The 1.64-μm Er:YAG laser is a potentially useful eyesafe laser with numerous applications. An Er:glass laser has been used in an end-pumping arrangement which simulates diode pumping at 1.5 μm. Our results can be utilized to model the performance of diode-pumped 1.64-μm lasers. In an earlier study, a 1.47-μm F center laser pump was used to obtain 1.64-μm Er:YAG laser operation at 77 K.1 Subsequently, room temperature cw operation of Er:YAG was obtained with a krypton ion pump laser at 647.1 nm.2 In all the work cited, green fluorescence was observed. The upconversion process3 responsible for the emission of light from higher lying levels than the 4I3/2 level (obtained by absorption of 1.5-μm pump photons) constitutes an important loss mechanism. Studies which attempt to assess this loss mechanism and its influence on optimal laser design are presented.

© 1992 Optical Society of America

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