Analytic description of a homogeneously broadened injection laser

Journal Article · Wed Aug 01 00:00:00 EDT 1984 · IEEE J. Quant. Electron.; (United States)

DOI:https://doi.org/10.1109/JQE.1984.1072481· OSTI ID:6185998

Cassidy, D T

Analytic expressions for modeling the steady-state spectral output of homogeneously broadened lasers are presented. The expressions define the laser output in terms of the pumping rate, resonator reflectivities, arbitrary gain: pontaneous emission, and saturation profiles for each mode. To derive the analytic expressions the laser is idealized as a homogeneously broadened amplifier contained by a plane-parallel Fabry-Perot resonator. Rate equations are used to describe the interaction of the laser-mode intensities and population inversion over an infinitesimal section of the amplifier and differential equations describing the amplification of the modes as they pass through the gain section are deduced. Exact analytic solutions to these differential equations are found. These solutions, along with the boundary conditions imposed by the resonator, are used to specify completely the output of the laser. The model predicts a single-pass intensity gain which increases exponentially with pumping below threshold and saturates above threshold. An interesting result is that for a laser which is symmetric, an analysis which takes I/sup +/=I/sup -/=I, where I are intensities traveling in the + or - direction, gives results identical to an analysis which explicitly considers both I/sup +/ and I/sup -/, irrespective of the resonator mirror reflectivities. The predictions of the model are compared to the spectral output and single-pass intensity gain of a GaAs diode laser and found to be in good agreement. The laser model may be generalized in a straightforward manner to include feedback, compound cavities, and optical amplifiers.

• Research Organization: Department of Communications, Communications Research Centre, Ottawa, Ontario K2H 8S2
• OSTI ID: 6185998
• Journal Information: IEEE J. Quant. Electron.; (United States), Vol. QE-20:8
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
SEMICONDUCTOR LASERS
EMISSION SPECTRA
LINE BROADENING
MATHEMATICAL MODELS
ANALYTICAL SOLUTION
GALLIUM ARSENIDES
KINETIC EQUATIONS
PUMPING
REFLECTIVITY
RESONATORS
STEADY-STATE CONDITIONS
ARSENIC COMPOUNDS
ARSENIDES
ELECTRONIC EQUIPMENT
EQUATIONS
EQUIPMENT
GALLIUM COMPOUNDS
LASERS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
PNICTIDES
SEMICONDUCTOR DEVICES
SPECTRA
SURFACE PROPERTIES
420300* - Engineering- Lasers- (-1989)