An efficient single-frequency laser-diode pumped, continuous wave (CW) ring Nd laser emitting at 1064.4 nm is demonstrated. A composite crystal (Nd:YVO 4 /YVO 4 ) with undoped ends is single end pumped by a fiber-coupled laser diode (LD) at 808 nm. A four-mirror ring cavity is deigned to keep the laser unidirectional operating, which eliminate spatial hole burning in standing-wave cavity. With the incident pump power of 31.5 W, the obtained output power is 13.6 W, with a slope efficiency of 52.6% and an optical efficiency of 43.2%. At the same time, a beam quality of M 2 ∼ 1.1 is found.
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Zhao et al. (2010) studied this question.
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