[1] [1] W. Gordy and R. L. Cook, Microwave Molecular Spectra (Jchn Wiley & Sons, New York, 1984).

[2] [2] R. A. McClatchey, R. W. Fenn, J. E. A. Selby, F. E. Volz, and J. S. Garing, in Handbook of Optics, W. G. Driscoll (eds.), (McGraw Hill, New York, 1978).

[3] [3] A. Bykhovski, T. Globus, T. Khromova, B. Gelmont, and D. Woolard, Int. J. High Speed Electron. Syst. 17, 225 (2007).

[4] [4] A. Lee, Q. Qin, S. Kumar, B. S. Williams, Q. Hu, and J. L. Reno, Appl. Phys. Lett. 89, 141125 (2006).

[5] [5] L. Xu, X.-C. Zhang, and D. H. Auston, Appl. Phys. Lett. 61, 1784 (1992).

[6] [6] D. H. Auston, K. P. Cheung, and P. R. Smith, Appl. Phys. Lett. 45, 284 (1984).

[7] [7] D. H. Auston, K. P. Cheung, J. A. Valdmanis, and D. A. Kleinman, Phys. Rev. Lett. 53, 1555 (1984).

[8] [8] K. P. Cheung and D. H. Auston, Infrared Phys. 26, 23 (1986).

[9] [9] M. van Exter, C. Fattinger, and D. Grischkowsky, Opt. Lett. 14, 1128 (1989).

[10] [10] H.-B. Liu, Y. Chen, G. J. Bastiaans, and X.-C. Zhang, Opt. Exp. 14, 415 (2006).

[11] [11] D. M. Mittleman, S. Hunnsche, L. Boivin, and M. C. Nuss, Opt. Lett. 22, 904 (1997).

[12] [12] K. Kawase, M. Sato, T. Taniuchi, and H. Ito, Appl. Phys. Lett. 68, 2483 (1996).

[13] [13] W. Shi, Y. J. Ding, N. Fernelius, and K. L. Vodopyanov, Opt. Lett. 27, 1454 (2002).

[14] [14] W. Shi and Y. J. Ding, Appl. Phys. Lett. 84, 1635 (2004).

[15] [15] W. Shi and Y. J. Ding, Int. J. High Speed Electron. Syst. 16, 589 (2006).

[16] [16] W. Shi and Y. J. Ding, Optics and Photonics New 57 (2002).

[17] [17] W. Shi and Y. J. Ding, Appl. Phys. Lett. 83, 848 (2003).

[18] [18] W. Shi, Y. J. Ding, and P. G. Schunemann, Opt. Commun. 233, 183 (2004).

[19] [19] W. Shi and Y. J. Ding, Opt. Lett. 30, 1030 (2005).

[20] [20] Y. J. Ding and W. Shi, Sol. State Electron. 50, 1128 (2006).

[21] [21] W. Shi, X. Mu, Y. J. Ding, and N. Fernelius, Appl. Phys. Lett. 80, 3889 (2002).

[22] [22] W. Shi and Y. J. Ding, Laser Phys. Lett. 1, 560 (2004).

[23] [23] H. Sun, Y. J. Ding, and I. B. Zotova, IEEE Sens. J. 10, 621 (2010).

[24] [24] H. Sun, Y. J. Ding, and Y. B. Zotova, Appl. Opt. 46, 3976 (2007).

[25] [25] R. Song, Y. J. Ding, and Y. B. Zotova, Intern. J. High Speed Electron. Syst. 17, 251 (2007).

[26] [26] R. Song, Y. J. Ding, and I. B. Zotova, Proc SPIE 6949, 694903 (2008).

[27] [27] Y. Jiang, Y. J. Ding, and I. B. Zotova, Appl. Phys. Lett. 96, 031101 (2010).

[28] [28] Y. Jiang, D. Li, Y. J. Ding, and I. B. Zotova, Opt. Lett. 36, 1608 (2011).

[29] [29] P. Zhao, S. R. Ragam, Y. J. Ding, and I. B. Zotova, Opt. Lett. 35, 3979 (2010).

[30] [30] P. Zhao, S. Ragam, Y. J. Ding, and I. B. Zotova, Appl. Phys. Lett. 98, 131106 (2011).

[31] [31] L. P. Gonzalez, S. Guha, and S. Trivedi, in Proceedings of CLEO Technical Digest on CD-ROM CWA47 (2004).

[32] [32] F. L. Madarasz, J. O. Dimmock, N. Dietz, and J. Bachmann, J. Appl. Phys. 87, 1564 (2000).

[33] [33] D. N. Nikogosyan, Nonlinear Optical Crystals (Springer, New York, 2005).

[34] [34] A. Yariv, Quantum Electronics (John Wiley & Sons, New York, 1989) p. 399.

[35] [35] B. Frei and J. E. Balmer, Appl. Opt. 33, 6942 (1994).

[36] [36] H. Zbinden and J. E. Balmer, Opt. Lett. 15, 1014 (1990).

[37] [37] B. Wu, P. Jiang, D. Yang, T. Chen, J. Kong, and Y. Shen, Opt. Express 17, 6004 (2009).

[38] [38] W. Koechner and M. Bass, Solid-State Lasers (Springer, New York, 2003) pp. 63-65.

[39] [39] F. Trager (eds.), Handbook of Lasers and Optics (Springer, New York, 2007).

[40] [40] Y. Avetisyan, Y. Sasaki, and H. Ito, Appl. Phys. B 73, 511 (2001).

[41] [41] Y. J. Ding, Opt. Lett. 35, 262 (2010).