Abstract

An $\mathrm{Nd}\text{:}\mathrm{YAG}/\mathrm{YAG}/{\mathrm{Cr}}^{4+}\text{:}\mathrm{YAG}/\mathrm{YAG}$ composite crystal and an LBO crystal were used to generate a passively $Q$-switched frequency-doubling 473 nm blue laser for the first time, to the best of our knowledge. The result demonstrated that the slope efficiency of this system reaches 18%, which is the highest in all the passively $Q$-switched 473 nm laser systems reported, to the best of our knowledge. Under the pumped power of 8.64 W, the maximum average output power of 0.93 W was obtained with a pulsewidth of 78 ns, and the repetition rate of 18.5 kHz.

© 2016 Optical Society of America

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