Open AccessEnhanced dispersion compensation capability of angular elements based on beam expansion
Author(s) -
Rui Du,
Runhua Jiang,
Ling Fu
Publication year - 2009
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.17.016415
Subject(s) - optics , dispersion (optics) , beam (structure) , materials science , femtosecond , group delay dispersion , compensation (psychology) , laser , pulse (music) , beam diameter , laser beams , physics , optical fiber , dispersion shifted fiber , psychology , fiber optic sensor , detector , psychoanalysis
We demonstrate that beam size manipulation plays an important role in dispersion compensation. With expanded beam, the maximal negative group delay dispersion (GDD) provided by angular elements increases by an order of magnitude compared with original beam. Both calculation and experimental results show that a modest 2 x and 4 x expanded beams can improve dispersion compensation capability of prisms or acousto-optical deflectors: the restored minimal pulse width decreases by 50% and the corresponding distance between angular elements is shortened more than 70 cm. These findings will be helpful for designing dispersion compensation schemes for femtosecond pulse laser application systems such as multiphoton microscopy or laser micromachining.