FM characteristics and compact modules for coherent semiconductor lasers coupled to an external cavity

Author

Shin, Chul-Ho ; Teshima, Mitsuhiro ; Ohtsu, Motoichi ; Imai, Tohru ; Yoshida, Junichi ; Nishide, Kenichi

Author_Institution

Tokyo Inst. of Technol., Yokohama, Japan

Volume

2

Issue

3

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

167

Lastpage

169

Abstract

Measured FM responses of a semiconductor laser optically coupled off-axis to a confocal Fabry-Perot cavity are discussed. It was found that this cavity acted as a frequency discriminator and as a phase comparator for slow and fast frequency fluctuations, respectively. The crossover between them was determined by a half linewidth of the cavity. On the basis of these investigations, two kinds of coherent semiconductor laser modules were constructed. External Fabry-Perot cavities were made by using an optical fiber and a hemispherical microlens. The linewidths of these lasers were less than 25 kHz.<>

Keywords

fibre optics; frequency modulation; laser accessories; laser cavity resonators; lenses; light coherence; optical modulation; semiconductor junction lasers; spectral line breadth; FM characteristics; coherent semiconductor laser modules; coherent semiconductor lasers; compact modules; confocal Fabry-Perot cavity; coupled external laser cavities; crossover; external cavity; fast frequency fluctuations; frequency discriminator; half linewidth; hemispherical microlens; off-axis coupling; optical fiber; optically coupled; phase comparator; semiconductor laser linewidths; slow frequency fluctuations; Fiber lasers; Frequency modulation; Laser feedback; Laser noise; Laser stability; Optical coupling; Optical feedback; Optical noise; Resonance; Semiconductor lasers;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/68.50878

Filename

50878