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Proceedings Paper

Near-infrared induced negative photoconductance and its relationship with optical quenching of mid-infrared quantum cascade lasers
Author(s): Dingkai Guo; Fow-Sen Choa; Liwei Cheng; Xing Chen
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Paper Abstract

We report in this work the near-Infrared (IR) induced negative photoconductance (NPC) on mid-IR Quantum Cascade Lasers (QCLs) and its relationship with the quenching of QCL. The NPC behaviour depends on the coupled near-IR intensity, wavelength and the QCL bias voltage amplitude. If the QCL is under pulse operations, it depends on the pulse width as well. From our interpretation, the NPC is related to electron-hole pair generation and hole-trapping, which produces an internal field counteracting to the external field. The created band-bending effect will reduce the current, increase the resistance, and reduce the mid-IR light output, which has been reported earlier as the "optical quenching effect." We observed that only a near-IR laser with good quenching ability can modulate the mid-IR laser. Since the modulation speed exceeds more than 100 MHz, this excludes the possibility of a thermal origin of these results. The near-IR induced optical quenching effect has the potential to provide all optical modulation of mid-IR QCLs.

Paper Details

Date Published: 16 February 2011
PDF: 6 pages
Proc. SPIE 7953, Novel In-Plane Semiconductor Lasers X, 79531S (16 February 2011); doi: 10.1117/12.875910
Show Author Affiliations
Dingkai Guo, Univ. of Maryland, Baltimore County (United States)
Fow-Sen Choa, Univ. of Maryland, Baltimore County (United States)
Liwei Cheng, Univ. of Maryland, Baltimore County (United States)
Xing Chen, Univ. of Maryland, Baltimore County (United States)

Published in SPIE Proceedings Vol. 7953:
Novel In-Plane Semiconductor Lasers X
Alexey A. Belyanin; Peter M. Smowton, Editor(s)

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