Modulation spectroscopic approach to the study of photocurrent spectra in GaAs/GaAlAs QW-GRIN laser structures

Klaus H. Herrmann; Jens Wolfgang Tomm; Hessa Al-Otaibi

doi:10.1117/12.368332

4 November 1999 Modulation spectroscopic approach to the study of photocurrent spectra in GaAs/GaAlAs QW-GRIN laser structures

Klaus H. Herrmann, Jens Wolfgang Tomm, Hessa Al-Otaibi

Author Affiliations +

Proceedings Volume 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics; (1999) https://doi.org/10.1117/12.368332
Event: Material Science and Material Properties for Infrared Optoelectronics, 1998, Kiev, Ukraine

Abstract

The current transport through GaAs/GaAlAs quantum well graded index (QW GRIN) injection lasers was studied by photocurrent spectroscopy. The quantum efficiency is assumed to be proportional to the absorption coefficient. The observed absorption edges are attributed to transitions between different QW subbands. Measurements have been carried out with transverse electric (TE) and transverse magnetic (TM) light polarization in order to study the anisotropy due tot eh quantum well and the influence of the GRIN waveguide. Different spectroscopic modes have been compared, among them a setup with rotating polarizer. After background subtraction the observed edges can be compared with existing theories. The factors affecting the lineform are outlined.

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Klaus H. Herrmann, Jens Wolfgang Tomm, and Hessa Al-Otaibi "Modulation spectroscopic approach to the study of photocurrent spectra in GaAs/GaAlAs QW-GRIN laser structures", Proc. SPIE 3890, Fourth International Conference on Material Science and Material Properties for Infrared Optoelectronics, (4 November 1999); https://doi.org/10.1117/12.368332

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