[2] [2] Hopkins F K. Nonlinear materials extend the range of high-power lasers. Laser Focus World, 1995, 31(7):87～93

[6] [6] Bosenberg W R, Guyer D R. Broadly tunable single-frequency optical parametric frequency-conversion system. J. Opt. Soc. Am (B), 1993, 10(9):1717～1722

[7] [7] Marshall L R, Kaz A. Eye-safe output from noncritically phase-matched parametric oscillators. J. Opt. Soc. Am. (B), 1993, 10(9):1730～1736

[8] [8] Kato K. Second-harmonic and sum-frequency generation to 4950 and 4589  in KTP. IEEE J. Quant. Electron., 1988, 24(1):3～4

[9] [9] Rockwell D A. A review of phase-conjugate solid-state lasers. IEEE J. Quant. Electron., 1988, 24(6):1124～1139