Title :
Simple method to evaluate coupling functions at antireflection-coated diode facets facing grating reflectors of long external cavities
Author :
Chen, Jianguo ; Li, Binzhong ; Wu, Lan ; Li, Dayi ; Lu, Yucun
Author_Institution :
Dept. of Optoelectron., Sichuan Univ., Chengdu, China
Abstract :
The spectral content of the reflected light from a grating, positioned at a distance much longer than the diode length to form an external-cavity semiconductor laser, has been studied. The analytical expressions derived show that the coupling coefficient at the antireflection (AR)-coated diode facet facing the extended cavity can be divided into two factors, of which one is due to the off-overlapping between the centers of the diode mode and its reflected counterpart, and the other is due to the alteration of the wave vector after being dispersed by the grating.<>
Keywords :
antireflection coatings; diffraction gratings; laser cavity resonators; laser theory; optical films; reflectivity; semiconductor lasers; analytical expressions; antireflection-coated diode facets; coupling coefficient; coupling functions; diode length; diode mode; external-cavity semiconductor laser; grating reflectors; long external cavities; off-overlapping; reflected light; spectral content; wave vector; Collimators; Diffraction gratings; Laser modes; Lenses; Optical coupling; Optical feedback; Optical reflection; Semiconductor diodes; Semiconductor lasers; Tunable circuits and devices;
Journal_Title :
Photonics Technology Letters, IEEE
