Continuous-wave ultraviolet generation at 354 nm in a periodically poled MgO:LiNbO3 by frequency tripling of a diode end-pumped Nd:GdVO4 microlaser

Mizuuchi, K.; Morikawa, A.; Sugita, T.; Yamamoto, K.; Pavel, N.; Taira, T.
November 2004
Applied Physics Letters;11/1/2004, Vol. 85 Issue 18, p3959
Academic Journal
Continuous-wave UV radiation at 354 nm, the third harmonic of a Nd:GdVO4 laser operating at 1063 nm, is reported from single-pass cascaded, first-order periodically poled MgO:LiNbO3 (PPMgLN) crystals. A high-voltage multipulse poling method was used in order to realize PPMgLN with uniform domain period (Λ) of micron-order width and 50% duty cycle along the entire crystal length. Initially, second-harmonic generation of the 1063 nm Nd:GdVO4 laser at 2.1%/W conversion efficiency, producing 1.15 W at 531 nm, is obtained from a 10-mm-long PPMgLN with Λ=6.95 μm. Sum frequency mixing of this 531 nm light with the residual 1063 nm fundamental radiation in a 3.6-mm-long PPMgLN with Λ=1.78 μm produces 47 mW of UV with 3.9%/W/cm normalized conversion efficiency.


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