Open AccessUniform response high resolution tunable optical filtering using a grating-assisted acousto-optic device
Author(s) -
David Bitauld,
Isabelle Zaquine,
A. Maruani,
R. Frey
Publication year - 2005
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/opex.13.006438
Subject(s) - optics , materials science , wavelength , grating , diffraction efficiency , diffraction grating , bragg's law , acousto optics , diffraction , fiber bragg grating , reflection (computer programming) , blazed grating , dispersion (optics) , optoelectronics , resolution (logic) , physics , computer science , artificial intelligence , programming language
A new filtering technique is proposed that associates the high dispersion of standard reflection gratings with the tuning speed of acousto-optic cells. Tuning is performed by adjusting the grating period so that the chosen wavelength is at Bragg resonance. In this way, the selected wavelength always experiences a maximum diffraction efficiency, ensuring good uniformity. Using a commercial acousto-optic modulator, a wavelength selectivity of 0.075 nm is demonstrated together with a uniformity of +/-0.2 dB on a tuning range of 2.2 nm corresponding to N = 30 resolvable frequencies. N > 600 could be obtained with an acousto-optic cell specially designed for this device.