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. Author manuscript; available in PMC: 2009 Dec 1.
Published in final edited form as: Microsc Res Tech. 2008 Dec;71(12):887–896. doi: 10.1002/jemt.20634

Fig. 4.

Fig. 4

TPE efficiency in a two-photon excitation fluorescence microscope with light pulses delivered by different fibers. Quadratic dependence of sample fluorescence as a function of power indicates TPE process. Fiber delivery is much less efficient for TPE than for free space delivery. Among all the fibers tested, HCPCF6um is the most efficient fiber delivery medium.