[1] [1] W. Shi, E. B. Petersen, N. Moor, A. Chavez-Pirson, and N. Peyghambarian, Proc. SPIE 8164, 81640M (2011).

[2] [2] Y. Liu, J. Liu, and W. Chen, Chin. Opt. Lett. 9, 090604 (2011).

[3] [3] B. Liu, M. Hu, X. Fang, Y. Wu, Y. Song, L. Chai, C. Wang, and A. M. Zheltikov, Laser Phys. Lett. 6, 44(2009).

[4] [4] Y. Feng, J. Zhou, S. Du, and W. Chen, in Proceedings of 2009 CLEO/Pacif ic Rim 633 (2009).

[5] [5] J. Yun, C. Gao, S. Zhu, C. Sun, H. He, L. Feng, L. Dong, and L. Niu, Chin. Opt. Lett. 10, 121402 (2012).

[6] [6] M. Cheng, Y. Chang, A. Galvanauskas, P. Mamidipudi, R. Changkakoti, and P. Gatchell, Opt. Lett. 3, 358 (2005).

[7] [7] J. Wang, H. Lin, Y. Deng, D. Xu, R. Zhang, and M. Li, in Proceedings of SOF 2012 STu4F.2 (2012).

[8] [8] S. Desmoulins and F. Di Teodoro, Opt. Express 16, 2431 (2008).

[9] [9] J. Nilsson, in Proceedings of 2010 CLEO/QELS CTuC1 (2010).

[10] [10] P. Wan, J. Liu, L. Yang, and F. Amzajerdian, Opt. Express 19, 18067 (2011).

[11] [11] L. Lago, D. Bigourd, A. Mussot, M. Douay, and E. Hugonnot, Opt. Lett. 36, 734 (2011).

[12] [12] Y. Dai, The Principle of Lidar (in Chinese)(National Defence Industry Press, Beijing, 2002).

[13] [13] G. P. Agrawal, Nonlinear Fiber Optics, 4th ed. (Academic, Oxford, 2006).

[14] [14] Y. Wang, IEEE J. Quantum Electron. 41, 779 (2005).

[15] [15] K. T. Vu, “High power nanosecond pulsed fiber laser amplifiers” Master Thesis (University of Southampton, 2008).