Quantum Cascade Lasers
Recent applications of QCLsWe present two recent new applications of Quantum Cascade Lasers that have been recently published.
In the first paper published in Nature Communications, a team from ETH Zürich has used two AL broad gains lasers in frequency comb operation to perform dual-comb spectroscopy in the mid-infrared. They achieve broadband high-resolution (80 MHz) absorption spectroscopy.
Villares, G. et al.,Dual-comb spectroscopy based on quantum-cascade-laser frequency combs. Nat. Commun. 5:5192 doi: 10.1038/ncomms6192 (2014)
In the second experiment, which has been discussed in Laser Focus World, researchers at Stanford University have incorporated a QCL into a cavity-enhanced absorption spectroscopy instrument for detection of carbon monoxide (CO) in situ in a shock tube with high time resolution.
K. Sun et al., Opt. Exp., 6 October 2014; doi:10.1364/OE.22.024559.
A similar shock tube experiment has also been performed by the King Abdullah University of Science and Technology:
Robin S.M. Chrystie, Ehson F. Nasir, and Aamir Farooq, "Ultra-fast and calibration-free temperature sensing in the intrapulse mode", Optics Letters, 39(23), 6620-6623, (2014).
Intermittent CW modulation
A new modulation scheme has been developed in collaboration between Alpes Lasers and Air Pollution / Environmental Technology group of EMPA. read more