Simultaneous laser action was observed at 2.94 and 3.01 μm by the Ho3+ ions, and at 1.06 μm by the Nd3+ ions. While the 3.01 μm wavelength has been reported in Ho:YA103,1 we believe this is the first report, of the 3.01 μm laser emission from YAG. By utilizing mirrors which had nearly equal reflectance at 1.34 and 1.06 μm, simultaneous lasing was observed at both Nd3+ wavelengths, a result of the absorptive losses at 1.06 μm due to the high concentration of Ho3+.

© 1987 Optical Society of America

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