Abstract
1.1-μm laser operation has been rarely investigated in laser materials other than Nd:YAG. In this report, using a diode end pumping geometry for providing a compact, low-threshold and high-efficiency system, continuous-wave and passively Q-switched Nd:LuYAG mixed crystal lasers at 1.1 μm were demonstrated, for the first time to our knowledge. In continuous-wave mode, a maximum output power up to 6.04 W was achieved at 1112.9 nm, 1116.64 nm and 1122.65 nm with a slope efficiency of 41.8%. Wavelength tuning was obtained from 1112.05 nm to 1123.17 nm discontinuously, which has never been demonstrated in Nd:YAG lasers. Moreover, using a Cr4+:YAG saturable absorber, stable passively Q-switched laser operation was also attained with a maximum average output power up to 1.71 W. The shortest pulse width was about 37.3 ns at repetition rate of about 21.52 kHz. The maximum pulse energy was about 79.3 μJ, which is believed to be the highest pulse energy that has ever been achieved in diode-end-pumped Nd3+ lasers at this specific 1.1 μm emission band.
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