We report the use of a 5-mm-long planar Nd:yttrium aluminum garnet waveguide grown by liquid-phase epitaxy as an amplifier at 1.064 μm. In a double-pass configuration pumped by a 1.2 W diode laser, small signal gains of 686 (28 dB) have been observed and efficient power extraction demonstrated with output powers of up to 290 mW being obtained.
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Shepherd et al. (1997) studied this question.
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