Title :
Waveguide-type acoustooptic frequency shifter driven by surface acoustic wave and its application to frequency-shifted feedback fibre laser
Author :
Kakio, Shoji ; Kitamura, Michihide ; Nakagawa, Yasuhiko ; Zou, Nianya ; Hara, Takefumi ; Ito, Hiromasa ; Iizuka, Takashi ; Kobayashi, Takehiko ; Watanabe, Masayuki
Author_Institution :
Interdisciplinary Graduate Sch. of Medicine & Eng., Yamanashi Univ., Kofu, Japan
Abstract :
In this paper, a waveguide-type acoustooptic frequency shifter (AOFS) driven by a surface acoustic wave in a tapered crossed-channel proton-exchanged waveguide on a 128° rotated Y-cut LiNbO3 substrate is demonstrated at an optical wavelength of 1.55 μm. A 35% diffraction efficiency and 10% throughput are obtained at an input voltage of 10 Vrms. Furthermore, frequency-shifted feedback laser oscillation with an AOFS module is realized, and an oscillation spectral width of 0.62 nm and a beat frequency spectral width of 12 kHz are demonstrated.
Keywords :
acousto-optical devices; fibre lasers; lithium compounds; optical waveguides; surface acoustic waves; 0.62 nm; 1.55 micron; 10 V; 12 kHz; 35 percent; beat frequency spectral width; frequency-shifted feedback fibre laser; optical wavelength; proton-exchanged waveguide; surface acoustic wave; tapered crossed-channel waveguide; waveguide-type acoustooptic frequency shifter; Acoustic waveguides; Acoustic waves; Fiber lasers; Frequency; Laser feedback; Optical feedback; Optical waveguides; Surface acoustic waves; Surface emitting lasers; Waveguide lasers;
Conference_Titel :
Ultrasonics, 2003 IEEE Symposium on
Print_ISBN :
0-7803-7922-5
DOI :
10.1109/ULTSYM.2003.1293264
