Autonomous ultra-short optical pulse compression, phase compensating and waveform shaping device

Abstract

Disclosed is an apparatus for autonomously compressing, phase-compensating and waveform-shaping an ultrashort light pulse that is fast and high in sensitivity in compensating for phase fluctuations and allows the use of a usual laser light source that is low in light intensity and has large temporal fluctuations in phase. The apparatus comprises: a pulsed light source (2); a spectroscopic spatial dispersing device (4) for spatially dispersing a light pulse (3) emitted from the pulsed light source (2) into spectral components thereof; a spatial light modulator (5) for adding a phase to each of the spectral components of the spatially dispersed light pulse (3); a multiplexer (6) for combining the phase added spectral components of the light pulse (3) together to form a composite output light pulse (7); a modified SPIDER device (8) for forming a spectral interference figure from a portion of the composite output light pulse (7); and a feedback device (9) for detecting a spectral phase from the spectral interference figure and feeding a signal representing a difference between the detected spectral phase and a pre-established phase back to the spatial light modulator (5). The modified SPIDER device (8) comprises: a pulsed light source for a chirped light pulse (8a); a delay unit (8c) for delaying a light pulse (8b) from the pulsed light source (8a) with an adjustable delay time; a dispersive medium (28) for forming a chirped light pulse (29) from the light pulse whose delay time is adjusted by the delay unit (8c); a replica pulse former (24) for forming from a portion of the output light pulse (7) a pair of replica light pulses (24a, 24b) one delayed after the other; a nonlinear optical crystal (31) for frequency-mixing the two replica pulses (24a, 24b) with the chirped light pulse (29); a spectrometer (8e) for forming an interference figure of the resultant two frequency-mixed replica light pulses; and an image reader (8f) for reading the interference figure of the two frequency-mixed replica light pulses.

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