scholarly journals Erratum: “Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line” [Appl. Phys. Lett. 96, 071112 (2010)]

2010 ◽  
Vol 96 (14) ◽  
pp. 149902
Author(s):  
H. Richter ◽  
S. G. Pavlov ◽  
A. D. Semenov ◽  
L. Mahler ◽  
A. Tredicucci ◽  
...  
Keyword(s):  
Absorption Line ◽  
Quantum Cascade Laser ◽  
Frequency Stabilization ◽  
Molecular Absorption ◽  
Quantum Cascade

Submegahertz frequency stabilization of a terahertz quantum cascade laser to a molecular absorption line

2010 ◽  
Vol 96 (7) ◽  
pp. 071112 ◽  
Author(s):  
H. Richter ◽  
S. G. Pavlov ◽  
A. D. Semenov ◽  
L. Mahler ◽  
A. Tredicucci ◽  
...  
Keyword(s):  
Absorption Line ◽  
Quantum Cascade Laser ◽  
Frequency Stabilization ◽  
Molecular Absorption ◽  
Quantum Cascade

scholarly journals Quantum cascade laser frequency stabilization at the sub-Hz level

2015 ◽  
Vol 9 (7) ◽  
pp. 456-460 ◽  
Author(s):  
Bérengère Argence ◽  
Bruno Chanteau ◽  
Olivier Lopez ◽  
Daniele Nicolodi ◽  
Michel Abgrall ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Laser Frequency ◽  
Frequency Stabilization ◽  
Quantum Cascade ◽  
Laser Frequency Stabilization

scholarly journals Continuous and high-precision atmospheric concentration measurements of COS, CO<sub>2</sub>, CO and H<sub>2</sub>O using a quantum cascade laser spectrometer (QCLS)

2016 ◽  
Vol 9 (11) ◽  
pp. 5293-5314 ◽  
Author(s):  
Linda M. J. Kooijmans ◽  
Nelly A. M. Uitslag ◽  
Mark S. Zahniser ◽  
David D. Nelson ◽  
Stephen A. Montzka ◽  
...  
Keyword(s):  
Spectral Line ◽  
Absorption Line ◽  
High Precision ◽  
Quantum Cascade Laser ◽  
Gross Primary Production ◽  
Laser Spectrometer ◽  
Atmospheric Measurements ◽  
Atmospheric Concentration ◽  
Quantum Cascade

Abstract. Carbonyl sulfide (COS) has been suggested as a useful tracer for gross primary production as it is taken up by plants in a similar way as CO2. To explore and verify the application of this novel tracer, it is highly desired to develop the ability to perform continuous and high-precision in situ atmospheric measurements of COS and CO2. In this study we have tested a quantum cascade laser spectrometer (QCLS) for its suitability to obtain accurate and high-precision measurements of COS and CO2. The instrument is capable of simultaneously measuring COS, CO2, CO and H2O after including a weak CO absorption line in the extended wavelength range. An optimal background and calibration strategy was developed based on laboratory tests to ensure accurate field measurements. We have derived water vapor correction factors based on a set of laboratory experiments and found that for COS the interference associated with a water absorption line can dominate over the effect of dilution. This interference can be solved mathematically by fitting the COS spectral line separately from the H2O spectral line. Furthermore, we improved the temperature stability of the QCLS by isolating it in an enclosed box and actively cooling its electronics with the same thermoelectric chiller used to cool the laser. The QCLS was deployed at the Lutjewad atmospheric monitoring station (60 m; 6°21′ E, 53°24′ N; 1 m a.s.l.) in the Netherlands from July 2014 to April 2015. The QCLS measurements of independent working standards while deployed in the field showed a mean difference with the assigned cylinder value within 3.3 ppt COS, 0.05 ppm for CO2 and 1.7 ppb for CO over a period of 35 days. The different contributions to uncertainty in measurements of COS, CO2 and CO were summarized and the overall uncertainty was determined to be 7.5 ppt for COS, 0.23 ppm for CO2 and 3.3 ppb for CO for 1-minute data. A comparison of in situ QCLS measurements with those from concurrently filled flasks that were subsequently measured by the QCLS showed a difference of −9.7 ± 4.6 ppt for COS. Comparison of the QCLS with a cavity ring-down spectrometer showed a difference of 0.12 ± 0.77 ppm for CO2 and −0.9 ± 3.8 ppb for CO.

Frequency stabilization of quantum cascade laser for spectroscopic CO2 isotope analysis

2018 ◽  
Vol 91 ◽  
pp. 37-45 ◽  
Author(s):  
Luo Han ◽  
Hua Xia ◽  
Tao Pang ◽  
Zhirong Zhang ◽  
Bian Wu ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Isotope Analysis ◽  
Frequency Stabilization ◽  
Quantum Cascade

scholarly journals Frequency stabilization of a single mode terahertz quantum cascade laser to the kilohertz level

2009 ◽  
Vol 17 (9) ◽  
pp. 7525 ◽  
Author(s):  
Andriy A. Danylov ◽  
Thomas M. Goyette ◽  
Jerry Waldman ◽  
Michael J. Coulombe ◽  
Andrew J. Gatesman ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Single Mode ◽  
Frequency Stabilization ◽  
Quantum Cascade
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