Analysis of the blazing effect in second-order gratings

Author

Matsumoto, Masayuki

Author_Institution

Dept. of Commun. Eng., Osaka Univ., Japan

Volume

28

Issue

10

fYear

1992

fDate

10/1/1992 12:00:00 AM

Firstpage

2016

Lastpage

2023

Abstract

The validity of the blazing effect for improving the output-coupling efficiency of second-order gratings for use in grating-coupled surface-emitting lasers is examined. The Floquet-Bloch expansion method is used for the analysis of finite-length gratings with asymmetric tooth shapes operated in resonance condition. It is shown that for saw-tooth gratings the blazing effect is almost lost around the second-order Bragg wavelength because the reflected guide mode generated in the distributed Bragg reflector radiates preferentially into the substrate. By using a parallelogram grating with equal tooth and groove lengths, however, a high efficiency of radiation into the air is attainable even at the Bragg wavelength while the reflectivity is reduced

Keywords

diffraction gratings; Bragg wavelength; Floquet-Bloch expansion method; asymmetric tooth shapes; blazing effect; distributed Bragg reflector; efficiency; finite-length gratings; grating-coupled surface-emitting lasers; groove lengths; parallelogram grating; reflected guide mode; reflectivity; resonance condition; saw-tooth gratings; second-order Bragg wavelength; second-order gratings; tooth lengths; Bragg gratings; Distributed Bragg reflectors; Distributed feedback devices; Optical reflection; Optical surface waves; Power lasers; Semiconductor lasers; Substrates; Surface emitting lasers; Teeth;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.159510

Filename

159510