AN ACHROMATIC LENS FOR FOCUSING FEMTOSECOND PULSES - DIRECT MEASUREMENT OF FEMTOSECOND PULSE FRONT DISTORTION USING A SECOND-ORDER AUTOCORRELATION TECHNIQUE

摘要

Pulse front distortion of ultrashort laser pulses in lenses used for ultrahigh intensity focusing in multiphoton ionisation experiments was measured using a second-order cross-correlation technique. An achromatic lens designed for diffraction limited f/2 focusing was shown to eliminate pulse front distortion and this was compared with the distortion caused by an f/2 doublet lens. [References: 9]