Abstract
We demonstrate a method for the measurement of femtosecond optical pulses in the focal point of a high-NA lens, using interferometric autocorrelation through two-photon absorption. A chirp-free input pulse of 47 fs is found to broaden by ≈50% after focusing by a well-compensated objective. With proper prechirp compensation, the actual pulse width in the focus of such a lens system can be restored to (almost) its initial value. The unique value of the presented two-photon autocorrelation technique is its capability of measuring the actual pulse width at the focal point of a high-NA lens, an aspect that is of direct importance to two-photon imaging approaches, for example.
© 1995 Optical Society of America
Full Article | PDF ArticleMore Like This
M. Müller and G. J. Brakenhoff
Opt. Lett. 20(21) 2159-2161 (1995)
Ivan Amat-Roldán, Iain G. Cormack, Pablo Loza-Alvarez, and David Artigas
Opt. Lett. 29(19) 2282-2284 (2004)
Jeffrey B. Guild, Chris Xu, and Watt W. Webb
Appl. Opt. 36(1) 397-401 (1997)