The semiconductor laser linewidth: A Green's function approach

Journal Article · Wed Dec 01 04:00:00 EST 1993 · IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States)

DOI:https://doi.org/10.1109/3.259403· OSTI ID:7071894

Herzel, F; Henneberger, K; Vogel, W ^[1]

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1. Univ. Rostock (Germany)

The linewidth problem of a semiconductor laser is studied on the basis of a non-equilibrium Green's function method. Starting from a continuous mode description of the radiation field, the low quality factor of semiconductor laser resonators is taken into account. For the case of a single lasing mode a linewidth formula is derived and related to the Schawlow-Townes expression. The linewidth is found to exceed the corresponding Schawlow-Townes value significantly. The reason for this effect consists in the fact that gain saturation prevents large inversion even far above threshold. This phenomenon is usually ignored and is shown to yield laser linewidths comparable with experiments.

• OSTI ID: 7071894
• Journal Information: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States), Journal Name: IEEE Journal of Quantum Electronics (Institute of Electrical and Electronics Engineers); (United States) Vol. 29:12; ISSN 0018-9197; ISSN IEJQA7
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
426002* -- Engineering-- Lasers & Masers-- (1990-)
ELECTROMAGNETIC RADIATION
ELECTRONIC EQUIPMENT
EMISSION SPECTRA
EQUIPMENT
LASER RADIATION
LASERS
LINE WIDTHS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATIONS
REFRACTIVE INDEX
RESONATORS
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SOLID STATE LASERS
SPECTRA