[1] M. Raybaut, T. Schmid, A. Godard, A. K. Mohamed, M. Lefebvre, F. Marnas, P. Flamant, A. Bohman, P. Geiser, and P. Kaspersen, Opt. Lett. 34, 2069 (2009).
[2] A. Amedie, A. Fix, M. Wirth, and G. Ehret, Appl. Phys. B 92, 295 (2008).
[3] A. Fix, C. Büdenbender, M. Wirth, M. Quatrevalet, A. Amediek, C. Kiemle, and G. Ehret, Proc. SPIE 8182, 818206 (2011).
[4] R. J. Foltynowicz and M. D. Wojcik, Appl. Remote Sensing 6, 053510 (2012).
[5] A. Fragemann, V. Pasiskevicius, G. Karlsson, and F. Laurell, Opt. Express 11, 1297 (2003).
[6] J. C. McCarthy, R. C. Day, and E. Chicklis, in Proceedings of Advanced Solid State Lasers 656, (2001).
[7] G. Arisholm, N. ?rnulf, and G. Rustad, Opt. Express 12, 4189 (2004).
[8] A. V. Smith and M.S. Bowers, Opt. Soc. Am. B 18, 706 (2001).
[9] T. Nishikawa and N. Uesugi J. Appl. Phys. 78, 6361 (1995).
[10] G. Arisholm, R. Paschotta, and S. Thomas, J. Opt. Soc. Am. B 21, 578 (2004).
[11] J. Wang, R. Zhu, J. Zhou, H. Zang, X. Zhu, and W. Chen, Chin. Opt. Lett. 9, 081405 (2011).
[12] B. Yao, X. Liu, X. Yu, X. Duan, Y. Ju, and Y. Wang, Chin. Opt. Lett. 11, 031405 (2013).
[13] T. Walther, M. P. Larsen, and E. S. Fry, Appl. Opt. 40, 3046 (2001).
[14] I. Jovanovic, B. J. Comaskey, and D. M. Pennington, J. Appl. Phys. 90, 4328(2001).
[15] H. Li, S. Li, X. Ma, X. Zhu, X. Tu, and Y. Zheng, Laser Phys. Lett. 10, 055403 (2013).
[16] T. Schr?der, C. Lemmerz, O. Reitebuch, M. Wirth, C. Wührer, and R. Treichel, Appl. Phys. B 87, 437 (2007).
