Efficient quasi-phase-matched frequency doubling with phase compensation by a wedged crystal in a standing-wave external cavity.

In standing-wave enhancement cavities for frequency doubling, second-harmonic fields are generated in both directions of propagation. To add the fields coherently, one should compensate for the phase shifts introduced by dispersive elements in the cavity. We experimentally demonstrate phase compensation in a compact standing-wave frequency-doubling cavity by use of a wedged periodically poled KTP crystal. The highest conversion efficiency and second-harmonic power obtained by pumping with a 1064-nm cw Nd:YAG laser were 69.4% and 268 mW, respectively.

[1]  M. Oron,et al.  Low temperature periodic electrical poling of flux-grown KTiOPO4 and isomorphic crystals , 1998 .

[2]  Robert L. Byer,et al.  Efficient second harmonic generation of a diode-laser-pumped CW Nd:YAG laser using monolithic MgO:LiNbO/sub 3/ external resonant cavities , 1988 .

[3]  S. Schiller,et al.  1.1-W single-frequency 532-nm radiation by second-harmonic generation of a miniature Nd:YAG ring laser. , 1996, Optics letters.

[4]  R L Byer,et al.  6.5-W, 532-nm radiation by cw resonant external-cavity second-harmonic generation of an 18-W Nd:YAG laser in LiB(3)O(5). , 1991, Optics letters.

[5]  M M Fejer,et al.  Phase correction in double-pass quasi-phase-matched second-harmonic generation with a wedged crystal. , 1998, Optics Letters.

[6]  R. Paschotta,et al.  82% Efficient continuous-wave frequency doubling of 1.06 microm with a monolithic MgO:LiNbO(3) resonator: errata. , 1994, Optics letters.

[7]  G. D. Boyd,et al.  Resonant optical second harmonic generation and mixing , 1966 .

[8]  C. B. Hitz,et al.  ENHANCEMENT OF OPTICAL SECOND HARMONIC GENERATION BY UTILIZING THE DISPERSION OF AIR , 1971 .

[9]  E S Polzik,et al.  Frequency doubling with KNbO(3) in an external cavity. , 1991, Optics letters.

[10]  G. Boyd,et al.  Parametric Interaction of Focused Gaussian Light Beams , 1968 .

[11]  John L. Hall,et al.  Laser phase and frequency stabilization using an optical resonator , 1983 .

[12]  R. Kallenbach,et al.  Doubly-resonant second-harmonic generation in β-barium-borate , 1989 .

[13]  A. Arie,et al.  Efficient resonant frequency doubling of a cw Nd:YAG laser in bulk periodically poled KTiOPO(4). , 1998, Optics letters.

[14]  S F Pereira,et al.  85% efficiency for cw frequency doubling from 1.08 to 0.54 ,microm. , 1992, Optics letters.