High-Power, Narrow-Linewidth Distributed-Feedback Quantum-Cascade Laser for Molecular Spectroscopy
Abstract
Quantum cascade lasers are versatile light sources in the mid-infrared range for molecular spectroscopy which find a wide range of applications from high-resolution studies to sensing. While devices with either high power or narrow spectral linewidth have previously been reported, there is still a lack of sources combining both of these characteristics which are particularly important for precision measurements of weak spectroscopic transitions. In this article, we describe and characterize a novel master-oscillator power-amplifier distributed-feedback quantum cascade laser designed to fill this gap. At an output power of 300 mW, the device features a free-running linewidth of 1.3 MHz, measured with a frequency discriminator technique, at an emission wavenumber of 2185 cm(-1). This linewidth is sufficiently narrow to enable a further reduction by a tight lock to a high-Q oscillator. Show more
Permanent link
https://doi.org/10.3929/ethz-b-000568711Publication status
publishedExternal links
Journal / series
PhotonicsVolume
Pages / Article No.
Publisher
MDPISubject
QCL; linewidth; spectroscopyOrganisational unit
03759 - Faist, Jérôme / Faist, Jérôme
02205 - FIRST-Lab / FIRST Center for Micro- and Nanoscience
Funding
183579 - Precision molecular spectroscopy using a network for distribution of the Swiss primary frequency standard (SNF)
Related publications and datasets
Is supplemented by: https://doi.org/10.3929/ethz-b-000564570
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