Calculation of the refractive indexes of lead chalcogenide salts and its application for injection lasers
Abstract
The refractive indexes N of some commonly used lead and lead-tin chalcogenide salts (PbSnSe, PbSSe, PbSnTe) have been calculated for frequencies near the fundamental absorption edge. The calculations take into account the nonparabolicity of the bands and population effects, both in thermal equilibrium and under lasing conditions. In contrast to previous predictions, the interband dispersion is shown to give a major contribution both to the change of N, due to lasing conditions, and to the derivative dN/dn (where n is the minority carrier concentration). Good agreement has been obtained between the calculations and experimental results for the dispersion of N, for epsilon(infinity), for the effective N in corrugated laser structures, and for the laser linewidth.
- Publication:
-
IEEE Journal of Quantum Electronics
- Pub Date:
- January 1985
- DOI:
- 10.1109/JQE.1985.1072527
- Bibcode:
- 1985IJQE...21...51S
- Keywords:
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- Chalcogenides;
- Injection Lasers;
- Laser Materials;
- Lead Compounds;
- Refractivity;
- Laser Outputs;
- Lasing;
- Spectral Line Width;
- Thermodynamic Equilibrium;
- Lasers and Masers