Power dependence of the linewidth enhancement term in semiconductor lasers

Journal Article · Fri Jun 15 04:00:00 EDT 1984 · Appl. Phys. Lett.; (United States)

DOI:https://doi.org/10.1063/1.94657· OSTI ID:7022251

Elsaesser, W

The theory of the spectral linewidth of a single longitudinal laser mode is re-examined on the basis of a phase diffusion model. The contribution to the linewidth resulting from the coupling of phase and amplitude (self-coupling term described by the enhancement factor ..cap alpha..) is investigated exactly. In particular, the commonly used approximation of a small spontaneous emission rate and/or strongly damped relaxation resonance is not applied. The self-coupling then results no longer in a constant enhanced slope in the Schawlow-Townes formula. The enhancement linewidth itself is now no linear function of the inverse optical power and decreases to zero in the limit of high spontaneous emission rates and small optical power. Therefore, deviations from the linear dependence of the mode linewidth on mode power are predicted.

• Research Organization: Max--Planck-Institut fuer Festkoerperforschung, 7000 Stuttgart 80, Heisenbergstrasse 1, Federal Republic of Germany
• OSTI ID: 7022251
• Journal Information: Appl. Phys. Lett.; (United States), Journal Name: Appl. Phys. Lett.; (United States) Vol. 44:12; ISSN APPLA
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLITUDES
AUGMENTATION
COUPLING
ELECTROMAGNETIC RADIATION
LASER RADIATION
LASERS
LINE WIDTHS
OSCILLATION MODES
POWER
RADIATIONS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS