Abstract

The dispersive nature of the acousto-optical deflector (AOD) presents a challenge to applications of two sequential orthogonal AODs (a two-dimensional AOD) as $XY$ scanners in multiphoton microscopy. Introducing a prism before the two-dimensional (2D) AOD allows both temporal and spatial dispersion to be compensated for simultaneously. A $90\mathrm{fs}$ laser pulse was broadened to $572\mathrm{fs}$ without compensation, and $143\mathrm{fs}$ with compensation. The ratio of long axis to short axis of the exiting laser beam spot was 3.50 without compensation and 1.14 with compensation. The insertion loss was 37%. Two-photon fluorescence microscopy used the compensated 2D AOD scanner to image a fluorescent microsphere, which improves signal intensity ~15-fold compared with the uncompensated scanner.

© 2006 Optical Society of America

Position of the prism in a dispersion-compensated acousto-optic deflector for multiphoton imaging

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