External cavity quantum cascade lasers with ultra rapid acousto-optic tuning
Abstract
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−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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Apr 06, 2015
- Source ID
- 10.1063/1.4917241
Entities
People
- Arkadiy Lyakh
- C. Kumar N. Patel
- I. Dunayevskiy
- R. Barron-jimenez
- R. Go
Organizations
- Army Research Office