Frequency and amplitude stabilized terahertz quantum cascade laser as local oscillator

Journal article (2012)

Authors

Y. Ren

D.J. Hayton

J.N. Hovenier

M. Cui

J.R. Gao

T.M. Klapwijk

S.C. Shi

T.Y. Kao

Q. Hu

J.L. Reno

Department

Quantum Nanoscience () (TU Delft)

DOI: https://doi.org/doi:10.1063/1.4751247

Optical receivers Actuators Microwave photonics Organic compounds Distributed feedback lasers Quantum cascade lasers Three-term control Terahertz wave spectra Superconducting mixers Feedback oscillators Laser frequency stability Optical attenuators Terahertz wave devices

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Published Date

06-09-2012

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Source:

Applied physics Letters, 101 (10), 2012

Faculty

Applied Sciences

Department

Quantum Nanoscience

Abstract

We demonstrate an experimental scheme to simultaneously stabilize the frequency and amplitude of a 3.5 THz third-order distributed feedback quantum cascade laser as a local oscillator. The frequency stabilization has been realized using a methanol absorption line, a power detector, and a proportional-integral-derivative (PID) loop. The amplitude stabilization of the incident power has been achieved using a swing-arm voice coil actuator as a fast optical attenuator, using the direct detection output of a superconducting mixer in combination with a 2nd PID loop. Improved Allan variance times of the entire receiver, as well as the heterodyne molecular spectra, are demonstrated.

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