Tunable terahertz quantum cascade lasers with external gratings
Author(s)Lee, Alan; Williams, Benjamin S.; Kumar, Sushil; Hu, Qing; Reno, John L.
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We demonstrate a frequency tunable external cavity terahertz quantum cascade laser using an abutted antireflection-coated silicon lens to reduce facet reflection and as a beam-forming element, with an external grating providing frequency selective optical feedback. Angle tuning of the grating allows a single longitudinal mode of the laser ridge to be selected, resulting in discontinuous tuning over a 165 GHz range around a center frequency of 4.4 THz. Another device exhibited 145 GHz of total tuning with 9 GHz of continuous tuning near the longitudinal modes of the laser.
DepartmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science; Massachusetts Institute of Technology. Research Laboratory of Electronics
Optical Society of America
Lee, Alan Wei Min, Benjamin S. Williams, Sushil Kumar, Qing Hu, and John L. Reno. “Tunable Terahertz Quantum Cascade Lasers with External Gratings.” Optics Letters 35, no. 7 (April 1, 2010): 910. © 2010 Optical Society of America
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