Direct measurement of the spectral phase of femtosecond optical pulse

Kai-Chien J. Chu; Jonathan Paul Heritage; R. S. Grant; Kowang Liu; Andrew Dienes; William E. White; Alan Sullivan

doi:10.1117/12.206411

10 April 1995 Direct measurement of the spectral phase of femtosecond optical pulse

Kai-Chien J. Chu, Jonathan Paul Heritage, R. S. Grant, Kowang Liu, Andrew Dienes, William E. White, Alan Sullivan

Proceedings Volume 2377, Generation, Amplification, and Measurement of Ultrashort Laser Pulses II; (1995) https://doi.org/10.1117/12.206411
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

In analogy to Young's double slit interference, the phase of the temporal beat between two oscillators with different frequencies is precisely the spectral phase difference between those oscillators. We present a technique that directly measures the spectral phase of femtosecond optical pulses using this double slit interference principle. A pair of narrow slits in a thin opaque sheet select two spectral frequencies from the femtosecond pulse spectrum in a zero dispersion pulse stretcher. Measurement of the temporal phase of a family of beat frequencies obtained over a range of slit spacings yields the desired spectral phase directly. We demonstrate this technique by accurately measuring the quadratic phase added to 80 femtosecond optical pulses by a 6.5 cm block of BK-7 glass.

Citation Download Citation

Kai-Chien J. Chu, Jonathan Paul Heritage, R. S. Grant, Kowang Liu, Andrew Dienes, William E. White, and Alan Sullivan "Direct measurement of the spectral phase of femtosecond optical pulse", Proc. SPIE 2377, Generation, Amplification, and Measurement of Ultrashort Laser Pulses II, (10 April 1995); https://doi.org/10.1117/12.206411

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