scholarly journals Time-resolved measurement of pulse-to-pulse heating effects in a terahertz quantum cascade laser using an NbN superconducting detector

2013 ◽  
Vol 103 (6) ◽  
pp. 061120 ◽  
Author(s):  
A. Valavanis ◽  
P. Dean ◽  
A. Scheuring ◽  
M. Salih ◽  
A. Stockhausen ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Pulse Heating ◽  
Superconducting Detector ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Heating Effects

A quantum cascade laser setup for studying irreversible photoreactions in H2O with nanosecond resolution and microlitre consumption

2020 ◽  
Vol 22 (45) ◽  
pp. 26459-26467
Author(s):  
Jessica L. Klocke ◽  
Tilman Kottke
Keyword(s):  
Infrared Spectroscopy ◽  
Quantum Cascade Laser ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Time Resolved Infrared Spectroscopy ◽  
Laser Setup

Flavin photoreduction in H2O is elucidated by developing a quantum cascade laser setup for time-resolved infrared spectroscopy on irreversible reactions.

First Demonstration of an Acousto-Optically Modulated Quantum Cascade Laser As a Broadband, Time-Resolved Combustion Diagnostic

2018 ◽  
Author(s):  
Zachary E. Loparo ◽  
Kareem Ahmed ◽  
Subith S. Vasu ◽  
Andrey V. Muraviev ◽  
Pedro Figueiredo ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Gas Turbines ◽  
Chemical Kinetic ◽  
Single Line ◽  
Line Of Sight ◽  
Spectral Measurements ◽  
Time Resolved ◽  
Quantum Cascade ◽  
No Formation ◽  
Multiple Species

We provide the first demonstration of an acousto-optically modulated quantum cascade laser (AOM QCL) system as a diagnostic for combustion by measuring nitric oxide (NO), a highly-regulated emission produced in gas turbines. The system provides time-resolved broadband spectral measurements of the present gas species via a single line of sight measurement, offering advantages over widely used narrowband absorption spectroscopy (e.g., the potential for simultaneous multi-species measurements using a single laser) and considerably faster (> 15kHz rates and potentially up to MHz) than sampling techniques which employ FTIR or GC/MS. The developed AOM QCL system yields fast tunable output covering a spectral range of 1725–1930 cm−1 with a linewidth of 10–15 cm−1. For the demonstration experiment, the AOM QCL system has been used to obtain time-resolved spectral measurements of NO formation during the shock heating of mixture of a 10% nitrous oxide (N2O) in a balance of argon over a temperature range of 1245–2517 K and a pressure range of 3.6–5.8 atm. Results were in good agreement with chemical kinetic simulations. The system shows revolutionary promise for making simultaneous time-resolved measurements of multiple species concentrations and temperature with a single line of sight measurement.

Time-Resolved Measurement of Combustion Gases in HighExplosive Detonations using a Swept-Wavelength External Cavity Quantum Cascade Laser

2020 ◽  
Author(s):  
Mark C. Phillips ◽  
Bruce E. Bernacki ◽  
Sivanandan S. Harilal ◽  
Brian E. Brumfield ◽  
Joel M. Schwallier ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
External Cavity ◽  
Time Resolved ◽  
Quantum Cascade ◽  
Combustion Gases

Time-Resolved Studies of Gain Dynamics in Quantum Cascade Laser

2007 ◽  
Author(s):  
Hyunyong Choi ◽  
Zong-Kwei Wu ◽  
Theodore B. Norris ◽  
Tobias Gresch ◽  
Marcella Giovannini ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Time Resolved ◽  
Quantum Cascade

Shock Tube Demonstration of Acousto-Optically Modulated Quantum Cascade Laser as a Broadband, Time-Resolved Combustion Diagnostic

2018 ◽  
Vol 140 (11) ◽  
Author(s):  
Zachary E. Loparo ◽  
Andrey V. Muraviev ◽  
Pedro Figueiredo ◽  
Arkadiy Lyakh ◽  
Robert E. Peale ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Gas Turbines ◽  
Chemical Kinetic ◽  
Single Line ◽  
Line Of Sight ◽  
Spectral Measurements ◽  
Time Resolved ◽  
Quantum Cascade ◽  
No Formation ◽  
Multiple Species

We provide the first demonstration of an acousto-optically modulated quantum cascade laser (AOM QCL) system as a diagnostic for combustion by measuring nitric oxide (NO), a highly regulated emission produced in gas turbines. The system provides time-resolved broadband spectral measurements of the present gas species via a single line of sight measurement, offering advantages over widely used narrowband absorption spectroscopy (e.g., the potential for simultaneous multispecies measurements using a single laser) and considerably faster (>15 kHz rates and potentially up to MHz) than sampling techniques, which employ fourier transform infrared (FTIR) or GC/MS. The developed AOM QCL system yields fast tunable output covering a spectral range of 1725–1930 cm−1 with a linewidth of 10–15 cm−1. For the demonstration experiment, the AOM QCL system has been used to obtain time-resolved spectral measurements of NO formation during the shock heating of mixture of a 10% nitrous oxide (N2O) in a balance of argon over a temperature range of 1245–2517 K and a pressure range of 3.6–5.8 atm. Results were in good agreement with chemical kinetic simulations. The system shows revolutionary promise for making simultaneous time-resolved measurements of multiple species concentrations and temperature with a single line of sight measurement.

Time-resolved measurements of light–current characteristic and mode competition in pulsed THz quantum cascade laser

2021 ◽  
Vol 60 (08) ◽  
Author(s):  
Yury V. Lobanov ◽  
Yury B. Vakhtomin ◽  
Ivan V. Pentin ◽  
Viktor A. Rosental ◽  
Konstantin V. Smirnov ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Mode Competition ◽  
Time Resolved ◽  
Current Characteristic ◽  
Quantum Cascade ◽  
Time Resolved Measurements

Time-resolved spectral characterization of a pulsed external-cavity quantum cascade laser

2012 ◽  
Author(s):  
Jean-Michel Melkonian ◽  
Myriam Raybaut ◽  
Antoine Godard ◽  
Johan Petit ◽  
Michel Lefebvre
Keyword(s):  
Quantum Cascade Laser ◽  
External Cavity ◽  
Spectral Characterization ◽  
Time Resolved ◽  
Quantum Cascade
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