[2] [2] A. Fix, T. Schroder, R. Wallenstein et al.. Tunable β-barium borate optical parametric oscillator: operating characteristics with and without injection seeding [J]. J. Opt. Soc. Am. B, 1993, 10(9):1744～1750

[3] [3] S. M. Russell, P. E. Power, M. J. Missey et al.. Broadband mid-infrared generation with two-dimensional quasi-phase-matched structures [J]. IEEE J. Quantum Electron., 2001, 37(7):877～887

[4] [4] D. J. Armstrong, W. J. Alford, T. D. Raymond et al.. Parametric amplification and oscillation with walkoff-compensating crystals [J]. J. Opt. Soc. Am. B, 1997, 14(2):460～474

[5] [5] Lawrence A. W. Gloster, Zhi Xing Jiang, Terence A. King. Characterization of an Nd∶YAG-pumped β-BaB2O4 optical parametric oscillator in collinear and noncollinear phase-matched configurations [J]. IEEE J. Quantum Electron., 1994, 30(12):2961～2969

[6] [6] S.-W. Lee, S. H. Kim, D. K. Ko et al.. High-efficiency and low-threshold operation of the pump reflection configuration in the noncollinear phase matching optical parametric oscillator [J]. Opt. Comm., 1997, 144(4～6):241～244

[7] [7] Stephen J. Brosnan, Robert L. Byer. Optical parametric oscillator threshold and linewidth studies [J]. IEEE J. Quantum Electron., 1979, 15(6):415～431