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With tin diselenide(SnSe2)film as a saturable absorber(SA),the passively Q-switched self-frequency doubling(SFD)lasers were realized in Nd^3+:ReCa4O(BO3)3(Re=Y,Gd)crystals.For Nd:YCa4O(BO3)3 crystal,the maximum average output power at 532 nm was 19.6 mW,a