Abstract
A sum-frequency yellow–green laser at 554.9 nm is reported by this paper, 946 nm wavelength is obtained from 4F 3/2– 4I 9/2 transition in Nd:YAG and 1342 nm wavelength is obtained from 4F 3/2– 4I 13/2 transition in Nd:YVO 4. Using a doubly folded-cavity type-II critical phase matching KTP crystal intra cavity to make 946 nm laser from Nd:YAG and 1342 nm laser from Nd:YVO 4 frequency summed, with incident pumped power of 30 W in Nd:YAG and 20 W in Nd:YVO 4, TEM 00 mode yellow–green laser at 554.9 nm at 1.15 W is obtained and its M 2 factor is less than 1.22. The experimental results show that the Nd:YAG and Nd:YVO 4 crystals intra-cavity sum-frequency mixing is an effective method for yellow–green laser and it can be applied to other two laser crystals to obtain more all-solid-state lasers with different wavelengths.
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