We succeeded in recording and observing a spatially and temporally continuous moving picture of visible femtosecond light pulse propagation by using light-in-flight recording by holography, for the first time. We applied second-harmonic generation (SHG) to a NIR femtosecond light pulse from a mode-locked Ti:sapphire laser to generate a visible femtosecond light pulse. The center wavelength and duration of the generated light pulse were 400 nm and 100 fs, respectively. We acquired a moving picture of a visible and collimated femtosecond light pulse that propagated on a diffuser plate for 145 ps. #

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The Feynman variational method is applied to a real functional integral representation of a generator for the velocity correlation functions in stationary homogeneous turbulence. The resulting approximation for the two-point correlation differs from that recently obtained by Lucke using a similar approach. It is pointed out that Lucke's approximation is based on a restricted trial function and does not correctly reproduce second-order perturbation theory in the limit of weak non-linearity. The approximation derived here does not suffer from this defect but is more complicated. Some defects of this general approach are discussed.

Observationof femtosecond laser pulses propagating in non-uniform optical media as form of motion pictureMasayuki AIHARA(1), Ayumi KUZUHRA(1), Kazunari KOMAI(1), Masatomo YAMAGIWA(1),Yasuhiro AWATSUJI(1),( 2), Kenzo NISHIO(1), Shogo URA(1). and Toshihiro KUBOTA(1)