[1] Denk W, Strickler J H, Webb W W. Two-photon laser scanning fluorescence microscopy. Science, 1990, 248(4958):73～76
[2] Gu M, Sheppard C J R. Comparison of three-dimensional imaging properties between two-photon and single-photon fluorescence microscopy. J. Microsc., 1995, 177(2):128～137
[3] Gu M. Resolution in three-photon fluorescence scanning microscopy. Opt. Lett., 1996, 21(13):988～990
[4] Wang L, Jacques S L, Zheng L. MCML-Monte Carlo modeling of photon transport in multi-layered tissues. Comp. Meth. and Prog. Biomed., 1995, 47(2):131～146
[5] Schmitt J M, Ben-Letaief K. Efficient Monte Carlo simulation of confocal microcopy in biological tissue. J. Opt. Soc. Am. (A), 1996, 13(5):952～961
[8] Gauderon R, Lukins P B, Sheppard C J R. Effect of a confocal pinhole in two-photon microscopy. Microsc. Res. and Tech., 1999, 47(2):210～214
[9] Shen Y R. The Principles of Nonlinear Optics. New York:John Wiley & Sons Inc., 1984.334
[10] Cheong W, Prahl S A, Welch A J. A review of the opical properties of biological tissues. IEEE J. Quant. Electron., 1990, 26(12):2166～2185
[11] Sheppard C J R. Confocal Laser Scanning Microscopy. London: BIOS Scientific Pub., 1997.33～43
[12] Gan X S, Schilders S P, Gu M. Image formation in turbid media under a microscope. J. Opt. Soc. Am. (A), 1998, 15(6):3052～3058
[13] Ying J, Liu F, Alfano R R. Spatial distribution of two-photon-excited fluorescence in scattering media. Appl. Opt., 1999, 38(1):224～229
