DocumentCode :
1098493
Title :
Polarization state of the emission of external grating diode lasers
Author :
Syvridis, D. ; Inaudi, D. ; Guekos, G.
Author_Institution :
Inst. of Quantum Electron., Swiss Federal Inst. of Technol., Zurich, Switzerland
Volume :
30
Issue :
4
fYear :
1994
fDate :
4/1/1994 12:00:00 AM
Firstpage :
966
Lastpage :
974
Abstract :
The laser emission of transverse electric (TE) and transverse magnetic (TM) polarization, in alternating successive spectral ranges, that can occur when external grating diode lasers are wavelength tuned, is theoretically and experimentally investigated. The modulated threshold gain curves of the external cavity for the two polarizations can be made to intersect with each other if a grating is used in such a way as to practically eliminate the difference between the laser diode losses and confinement factors for TE and TM polarization. The result is a sequence of wavelength ranges where the threshold gain is alternately lower for the TE resp. TM polarization. Within each range, a wavelength tunable single mode laser emission is obtained. The phenomenon is described, taking into account the characteristics of the key components of the external cavity, i.e., laser diode structure, antireflective (AR) coating, and grating efficiency. Design tools are proposed for the characteristics of the components necessary for the development of such an external cavity. The theoretical and design concepts are experimentally confirmed in a number of external cavities, using diode lasers emitting around 1.5 μm, with different types of antireflective coatings, as well as different grating configurations
Keywords :
antireflection coatings; diffraction gratings; laser cavity resonators; laser theory; light polarisation; optical modulation; semiconductor lasers; TE polarization; TM polarization; antireflective coating; confinement factors; design tools; external cavity; external grating diode lasers; grating; grating configurations; grating efficiency; laser diode losses; laser diode structure; laser emission; modulated threshold gain curves; polarization state; spectral ranges; threshold gain; wavelength ranges; wavelength tuned; Coatings; Diode lasers; Gratings; Laser modes; Laser theory; Laser tuning; Optical design; Polarization; Tellurium; Tunable circuits and devices;
fLanguage :
English
Journal_Title :
Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
0018-9197
Type :
jour
DOI :
10.1109/3.291367
Filename :
291367
Link To Document :
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