1. M. Yoshimura, K. Murase, T. Kamimura, K. Nakai, Y. Yap, Y. Mori, T. Sasaki, Y. Matsumoto, and Y. Okada, OSA Trends Opt. Photon. 26, 112–114 (1999).
2. C. Wang, G. Wang, A. Hicks, D. Dudley, H. Pang, and N. Hodgson, Proc. SPIE 26, 335–348 (2006).
3. H. Yoshida, N. Takcuchi, H. Okada, H. Fujita, and M. Nakatsuka, Jap. J. Appl. Phys. 26, 1012–1015 (2007).
4. J. Schwarz, M. Ramsey, D. Headley, P. Rambo, I. Smith and J. Porter, Appl. Phys. B: Lasers O 82, 275–281 (2006).
5. C. Liu, J. Ge, Z. Xiang, and J. Chen, Acta. Phys. Sin. 57, 4972–4977 (2008).