A terahertz pulse emitter monolithically integrated with a quantum cascade laser
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Author(s)
Kao, Tsung-Yu
Ban, Dayan
Lee, Alan
Hu, Qing
Reno, John
Burghoff, David Patrick
Date Issued
February 2011
Journal
Applied Physics Letters
Publisher
American Institute of Physics (AIP)
Citation
Burghoff, David, Tsung-Yu Kao, Dayan Ban, Alan Wei Min Lee, Qing Hu, and John Reno. “A Terahertz Pulse Emitter Monolithically Integrated with a Quantum Cascade Laser.” Appl. Phys. Lett. 98, no. 6 (2011): 061112. © 2011 American Institute of Physics
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Final published version
Abstract
A terahertz pulse emitter monolithically integrated with a quantum cascade laser(QCL) is demonstrated. The emitter facet is excited by near-infrared pulses from a mode-locked Ti:sapphire laser, and the resulting current transients generate terahertz pulses that are coupled into an electrically isolated QCL in proximity. These pulses are used to measure the gain of the laser transition at ~ 2.2 THz, which clamps above threshold at ~ 18 cm[superscript −1] and has a full width at half-maximum linewidth of ~ 0.67 THz. The measurement also shows the existence of absorption features at different biases that correspond to misalignment of the band structure and to absorption within the two injector states. The simplicity of this scheme allows it to be implemented alongside standard QCL ridge processing and to be used as a versatile tool for characterizing QCL gain media.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
Massachusetts Institute of Technology. Research Laboratory of Electronics
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1063/1.3553021
