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Title: External cavity quantum cascade lasers with ultra rapid acousto-optic tuning

We report operation of tunable external cavity quantum cascade lasers with emission wavelength controlled by an acousto-optic modulator (AOM). A long-wave infrared quantum cascade laser wavelength tuned from ∼8.5 μm to ∼9.8 μm when the AOM frequency was changed from ∼41MHz to ∼49 MHz. The laser delivered over 350 mW of average power at the center of the tuning curve in a linewidth of ∼4.7 cm{sup −1}. Measured wavelength switching time between any two wavelengths within the tuning range of the QCL was less than 1 μs. Spectral measurements of infrared absorption features of Freon demonstrated a capability of obtaining complete spectral data in less than 20 μs.
Authors:
; ; ; ;  [1]
  1. Pranalytica, Inc., 1101 Colorado Ave., Santa Monica, California 90401 (United States)
Publication Date:
OSTI Identifier:
22398838
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 106; Journal Issue: 14; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ABSORPTION; ACOUSTICS; DIAGRAMS; INFRARED RADIATION; LASER CAVITIES; LASERS; MHZ RANGE; OPERATION; OPTICS; PHOTON EMISSION; TUNING; WAVELENGTHS