Polarization of the spontaneous radiation of stressed laser heterostructures
1994; Elsevier BV; Volume: 37; Issue: 4-6 Linguagem: Inglês
10.1016/0038-1101(94)90402-2
ISSN1879-2405
AutoresA. A. Ptashchenko, Michael V. Deych, N.B. Mironchenko, F. A. Ptashchenko,
Tópico(s)Spectroscopy and Laser Applications
ResumoAbstract Measurement system with a rotating polaroid was constructed allowing to detect the degree of the light polarization (ρ) of 0.1% ρ as a function of driving current ( I ) and axial stress (σ) was studied for spontaneous output of the AlGaAs lasers at low pumping levels. It was found that in the range of sufficiently small currents ρ linearly depends on I and σ. When extrapolated to I = 0, ρ depends not only on σ, but also on the light amplification parameters of the individual laser structure. These observations must be taken into account when one attempts to estimate the strain in the active layer of a diode laser through the polarization measurements. The Cassidy's one-dimensional model of the polarization effects in diode lasers was modified to include modulation of the optical absorption by the stimulated emission in the active region at very low pumping intensities.
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