Multi-wavelength distributed feedback quantum cascade lasers for broadband trace gas spectroscopy
نویسندگان
چکیده
منابع مشابه
Photoacoustic Spectroscopy with Quantum Cascade Lasers for Trace Gas Detection
Various applications, such as pollution monitoring, toxic-gas detection, non invasive medical diagnostics and industrial process control, require sensitive and selective detection of gas traces with concentrations in the parts in 10 (ppb) and sub-ppb range. The recent development of quantum-cascade lasers (QCLs) has given a new aspect to infrared laser-based trace gas sensors. In particular, si...
متن کاملPhotoacoustic spectroscopy with quantum cascade distributed-feedback lasers.
We present photoacoustic (PA) spectroscopy measurements of carbon dioxide, methanol, and ammonia. The light source for the excitation was a single-mode quantum cascade distributed-feedback laser, which was operated in pulsed mode at moderate duty cycle and slightly below room temperature. Temperature tuning resulted in a typical wavelength range of 3cm(-1)at a linewidth of 0.2cm(-1). The setup ...
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In an effort to overcome current limitations to electrical tuning of quantum cascade lasers, a strategy is proposed which combines heterogeneous quantum cascade laser gain engineering with sampled grating architectures. This approach seeks to not only widen the accessible spectral range for an individual emitter, but also compensate for functional non-uniformity of reflectivity and gain linesha...
متن کاملPiezoacoustic modulation of gain and distributed feedback for quantum cascade lasers with widely tunable emission wavelength
Due to the piezoelectric properties of III–V materials, an acoustic wave propagating along the optical axis of a unipolar laser produces a periodic modulation of the carrier density and the optical gain, sufficient for providing distributed feedback ~DFB! with a mode suppression ratio exceeding 30 dB. In contrast to bipolar lasers, the piezoelectric modulation of unipolar carrier density is not...
متن کاملApplication of quantum cascade lasers to trace gas analysis
Quantum cascade (QC) lasers are virtually ideal mid-infrared sources for trace gas monitoring. They can be fabricated to operate at any of a very wide range of wavelengths from ∼ 3 μm to ∼ 24 μm. Seizing the opportunity presented by mid-infrared QC lasers, several groups world-wide are actively applying them to trace gas sensing. Real world applications include environmental monitoring, industr...
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ژورنال
عنوان ژورنال: Semiconductor Science and Technology
سال: 2019
ISSN: 0268-1242,1361-6641
DOI: 10.1088/1361-6641/ab2838