Abstract
Two-photon-excited fluorescence (TPEF) was one of the first original techniques to measure the duration of ultrashort laser pulses.1 In the following the TPEF was pushed to the side by the more efficient method of second-harmonic generation in a nonlinear crystal, where the additional advantage is the background-free correlation detection in noncollinear SHG geometry. Recently, with the appearance of femtosecond chirped-pulse regenerative amplifiers providing pulse energies well above 100 microjoule at 100-fs duration the TPEF may become again a competitive pulse duration measuring technique. At pulse intensities over 1-10 GW/cm2 the two-photon-excited fluorescence can be strong enough for easy detection with a conventional CCD camera. In contrast to the second-harmonic generation, the TPEF has no restrictions on spatial wave matching and much less restrictions on wavelength tuning.
© 1996 Optical Society of America
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