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form an operating condition of a diode-pumped simultaneous dual-wavelength Q-switched Nd:YAG laser operating at 1.06 lm and 946 nm. The dual-wavelength pulsed laser was realized successfully through adaptive coating design of the cavity mirrors. As much as 1.6 W total average output power of the dual-wavelength at 1.06 lm and 946 nm was achieved at the incident pump power of 14.2 W with an optical sion, laser noise, and so on. Over the last few years, a num-lasers has been reported. The laser at around 0.9 lm is dif-ficult to realize owing to the reabsorption loss of the quasi-three level system and the small stimulated emission cross-switched Nd:YAG laser operating at 1.06 lm and 946 nm Z Z Z 2r1ls1ðr; zÞgpðfa þ fbÞP thrpðr; zÞs=hcp faN 0dV L1 þ lnð1=r1r01Þ þ 2 lnð1=T 01Þ ð1Þ where the subscript 1 is used to denote the qualities at 946 nm, r1 is the stimulated emission cross-section o