Open AccessDispersion characteristics of acousto-optic deflector for scanning Gaussian laser beam of femtosecond pulses
Author(s) -
Derong Li,
Shaoqun Zeng,
Xiaohua Li,
Jun Liu,
Rui Du,
Runhua Jiang,
Wei R. Chen,
Qingming Luo
Publication year - 2007
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.15.004726
Subject(s) - optics , femtosecond , dispersion (optics) , materials science , laser , gaussian beam , diffraction , beam (structure) , pulse (music) , grating , femtosecond pulse shaping , physics , detector
Pulse evolution after the acousto-optic deflector (AOD) and its dependence on AOD parameters is not clear, but is important to AOD applications in scanning microscopy. By considering the abnormal Bragg AOD as a combination of a dispersion media and a diffraction grating with Littrow structure, the dispersion characteristics of AOD when scanning Gaussian laser beam of femtosecond pulses were analyzed. Pulse width about AOD parameters was explored theoretically and verified with experiments. It is found that after exiting AOD, the pulse width of laser beam either merely decreases or first decreases and then increases before it finally goes steady with the propagation distance, depending on the interaction between the material dispersion and angular dispersion.