High-temperature, continuous-wave operation of terahertz quantum-cascade lasers with metal-metal waveguides and third-order distributed feedback | Zendy

M. Wienold | Zendy; Benjamin Röben | Zendy; L. Schrottke | Zendy; Rajesh Sharma | Zendy; A. Tahraoui | Zendy; K. Biermann | Zendy; H. T. Grahn | Zendy

Open Access

High-temperature, continuous-wave operation of terahertz quantum-cascade lasers with metal-metal waveguides and third-order distributed feedback

Author(s) -

M. Wienold,

Benjamin Röben,

L. Schrottke,

Rajesh Sharma,

A. Tahraoui,

K. Biermann,

H. T. Grahn

Publication year - 2014

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.22.003334

Subject(s) - terahertz radiation , cascade , resonator , continuous wave , materials science , optics , laser , waveguide , optoelectronics , wafer , beam (structure) , plasmon , physics , chemistry , chromatography

Currently, different competing waveguide and resonator concepts exist for terahertz quantum-cascade lasers (THz QCLs). We examine the continuous-wave (cw) performance of THz QCLs with single-plasmon (SP) and metal-metal (MM) waveguides fabricated from the same wafer. While SP QCLs are superior in terms of output power, the maximum operating temperature for MM QCLs is typically much higher. For SP QCLs, we observed cw operation up to 73 K as compared to 129 K for narrow (≤ 15 μm) MM QCLs. In the latter case, single-mode operation and a narrow beam profile were achieved by applying third-order distributed-feedback gratings and contact pads which are optically insulated from the intended resonators. We present a quantitative analytic model for the beam profile, which is based on experimentally accessible parameters.

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