Analysis of diode laser properties
Journal Article
·
· IEEE J. Quant. Electron.; (United States)
An analytic model of diode lasers applicable to both the lasing and the nonlasing states is described. For these homogeneously broadened devices, spectral envelope widths for TE /sub infinity/ and TM /sub infinity/ modes are related to power in each modal family and are shown to depend critically on spontaneous emission coupling into the transverse modes. Thus, lasers with real-refractive index waveguiding (and associated weak spontaneous emission coupling) operate single longitudinal mode above threshold, whereas gain-guided devices run multimode. After connecting gain and spontaneous emission, a charge conservation equation, containing optical power in the form of a stimulated emission term, pumping current, spontaneous emission, and spectral width, is derived. These equations are then demonstrated to suffice for determination of the complete L versus I characteristic. For lasers in which both charge and mode confinement exist, such as the buried heterostructure and channelled-substrate narrow stripe types, it is shown that both TM /sub infinity/ power and spectral envelope width approach limiting values at threshold, whereas TE /sub infinity/ mode power grows in conjunction with TE /sub infinity/ spectral envelope narrowing.
- Research Organization:
- Palo Alto Research Center, Xerox Corporation, Palo Alto, CA 94304
- OSTI ID:
- 6159787
- Journal Information:
- IEEE J. Quant. Electron.; (United States), Journal Name: IEEE J. Quant. Electron.; (United States) Vol. 18:11; ISSN IEJQA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CONTROL
COUPLING
DESIGN
EMISSION
EMISSION SPECTRA
ENERGY
ENERGY-LEVEL TRANSITIONS
EQUATIONS
GAIN
LASERS
LIMITING VALUES
LINE NARROWING
LINE WIDTHS
MATHEMATICAL MODELS
MODE CONTROL
OPERATION
OPTICAL PUMPING
PUMPING
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTRA
STIMULATED EMISSION
THRESHOLD ENERGY
WAVEGUIDES
420300* -- Engineering-- Lasers-- (-1989)
AMPLIFICATION
CONTROL
COUPLING
DESIGN
EMISSION
EMISSION SPECTRA
ENERGY
ENERGY-LEVEL TRANSITIONS
EQUATIONS
GAIN
LASERS
LIMITING VALUES
LINE NARROWING
LINE WIDTHS
MATHEMATICAL MODELS
MODE CONTROL
OPERATION
OPTICAL PUMPING
PUMPING
SEMICONDUCTOR DEVICES
SEMICONDUCTOR LASERS
SPECTRA
STIMULATED EMISSION
THRESHOLD ENERGY
WAVEGUIDES