Effect of carriers on the optical properties of AlGaAs/GaAs interdiffused quantum well lasers

E. Herbert Li

doi:10.1117/12.251881

24 September 1996 Effect of carriers on the optical properties of AlGaAs/GaAs interdiffused quantum well lasers

E. Herbert Li

Proceedings Volume 2886, Semiconductor Lasers II; (1996) https://doi.org/10.1117/12.251881
Event: Photonics China '96, 1996, Beijing, China

Abstract

The carrier-induced effects in the change of refractive index on the GaAs/Al_WGa_1-W as square quantum well (SqQw) and diffused quantum well (DFQW) was investigated. Band-filling, bandgap shrinkage, and free- carrier absorption were included. Carrier concentrations from 10¹⁶ to 10¹⁸ cm^-3 were considered. The energy levels and their associated wavefunctions in the SqQW or DFQW structures are calculated by solving both the Schroedinger and the Poisson equations self-consistently. It is followed by the absorption change, which is defined as the difference between the absorption coefficient with carrier injection in QW and that without carrier injection. The refractive index change can be obtained by applying Kramers-Kronig Transformation. These results obtained are useful in the design of devices, such as lasers, optical phase, modulators and switches. Thus, it is important to know the carrier-induced energy shift in GaAs/Al_WGa$_1-W) as quantum well structures.

Citation Download Citation

E. Herbert Li "Effect of carriers on the optical properties of AlGaAs/GaAs interdiffused quantum well lasers", Proc. SPIE 2886, Semiconductor Lasers II, (24 September 1996); https://doi.org/10.1117/12.251881

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