We propose a method for direct conversion of an ultrashort pulse into a monochromatic beam whose wave front either repeats or is related to the phase structure of the pulse or its spectrum. This can be done by sum-frequency generation of the spectrally resolved pulses. Experimentally, we projected two spectra of the same chirped pulse onto the nonlinear crystal so that the dispersions were opposite. After sum-frequency generation, a converging or diverging monochromatic beam was formed that was the analog of the pulse spectrum. We could determine the chirp value by the measurement of the wave-front radius.
© 1996 Optical Society of America
Y. T. Mazurenko, S. E. Putilin, A. G. Spiro, A. G. Beliaev, V. E. Yashin, and S. A. Chizhov, "Ultrafast time-to-space conversion of phase by the method of spectral nonlinear optics," Opt. Lett. 21, 1753-1755 (1996)