scholarly journals Mass fluxes and isofluxes of methane (CH4) at a New Hampshire fen measured by a continuous wave quantum cascade laser spectrometer

2012 ◽  
Vol 117 (D10) ◽  
pp. n/a-n/a ◽  
Author(s):  
Gregory W. Santoni ◽  
Ben H. Lee ◽  
Jordan P. Goodrich ◽  
Ruth K. Varner ◽  
Patrick M. Crill ◽  
...  
Keyword(s):  
New Hampshire ◽  
Quantum Cascade Laser ◽  
Continuous Wave ◽  
Laser Spectrometer ◽  
Quantum Cascade ◽  
Mass Fluxes

Standoff Detection of Oil and Powder Mixtures at 12 Meters Using a Tunable Quantum Cascade Laser-Based System with a Close Focus Telescope and Uncooled Infrared Detector

2021 ◽  
pp. 000370282110603
Author(s):  
J. Chance Carter ◽  
Phillip H. Paul ◽  
Joshua M. Ottaway ◽  
Peter Haugen ◽  
Anastacia M. Manuel
Keyword(s):  
Quantum Cascade Laser ◽  
Continuous Wave ◽  
Infrared Detector ◽  
Wave Mode ◽  
Infrared Source ◽  
Powder Mixtures ◽  
Quantum Cascade ◽  
System A ◽  
Continuous Wave Mode ◽  
Lock In

We have designed and demonstrated a quantum cascade laser (QCL) based standoff system that utilizes an uncooled mercury cadmium telluride (MCT) detector with lock-in signal processing for chemical identification at a distance of 12.5 meters in indoor ambient light conditions. In the system, a tunable quad-QCL operating (1 MHz) in quasi-continuous wave mode between 8.45 and 10.03 μm (∼1182 to 1000 cm−1) serves as the active mid-infrared source for remotely interrogating mineral, powder, and thin film oil samples including powder mixtures (6, 12.5, 25, and 50%) of crystalline quartz (SiO2) in KBr. Light as reflected from a given sample is collected using a 10-inch (25.4 cm) Dall Kirkham telescope and coupled with ZnSe optics to an uncooled MCT detector. The mixture dependence of the highly transparent KBr and strongly absorbing quartz was found to fit a modified version of the Schatz reflectance model for compacted powder mixtures. All reflectance spectra reported are relative to an Au-coated diffuse reflector. A NIST traceable polystyrene standard reflector was also used to determine the QCL wavelength tuning range and calibration.

scholarly journals Repetition frequency locking of a terahertz quantum cascade laser emitting at 4.2 THz

2020 ◽  
Vol 13 (1) ◽  
pp. 32-40
Author(s):  
Wen Guan ◽  
Ziping Li ◽  
Kang Zhou ◽  
Wenjian Wan ◽  
Xiaoyu Liao ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Continuous Wave ◽  
Frequency Comb ◽  
Signal To Noise Ratio ◽  
Phase Lock Loop ◽  
Wave Mode ◽  
Repetition Frequency ◽  
Frequency Locking ◽  
Frequency Combs ◽  
Quantum Cascade

The electrically-pumped terahertz quantum cascade laser (QCL) is characterized by high power emission, compact, broad frequency coverage, and so on, which shows abilities for frequency comb operations. Although free-running QCLs can work as frequency combs by designing the laser structure with small group velocity dispersions and/or inserting mirrors to compensate laser intrinsic dispersions, the ideal comb operation can only be obtained by firmly locking the repetition frequency and carrier frequency of a laser. In this work, we have reported a repetition frequency locking of a terahertz QCL emitting around 4.2 THz. When the 6-mm-long laser is operated in continuous wave mode without any locking techniques, the repetition frequency is measured to be ~6.15 GHz with a linewidth of hundred kilohertz. Once a phase lock loop (PLL) is applied to dynamically control the drive current of the QCL, we have demonstrated a successful repetition frequency locking of the laser with a signal to noise ratio of 80 dB. This technique can be employed for the frequency comb and dual-comb operations of terahertz QCLs for high-resolution applications.

scholarly journals Watt-level, high wall plug efficiency, continuous-wave room temperature quantum cascade laser emitting at 77µm

2020 ◽  
Vol 28 (26) ◽  
pp. 40155
Author(s):  
Huan Wang ◽  
Jinchuan Zhang ◽  
Fengmin Cheng ◽  
Ning Zhuo ◽  
Shenqiang Zhai ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade ◽  
Wall Plug Efficiency

scholarly journals Continuous wave operation of a superlattice quantum cascade laser emitting at 2 THz

2006 ◽  
Vol 14 (1) ◽  
pp. 171 ◽  
Author(s):  
Chris Worrall ◽  
Jesse Alton ◽  
Mark Houghton ◽  
Stefano Barbieri ◽  
Harvey E. Beere ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Continuous Wave ◽  
Quantum Cascade ◽  
Continuous Wave Operation

Nitrous Acid Measurement Based on Room-Temperature Continuous Wave Quantum Cascade Laser

2013 ◽  
Vol 33 (4) ◽  
pp. 0430002
Author(s):  
崔小娟 Cui Xiaojuan ◽  
董凤忠 Dong Fengzhong ◽  
陈卫东 Chen Weidong ◽  
刘文清 Liu Wenqing ◽  
Eric Fertein Eric Fertein
Keyword(s):  
Quantum Cascade Laser ◽  
Nitrous Acid ◽  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade

scholarly journals Enhanced RDX Detection Studies on Various Types of Substrates via Tunable Quantum Cascade Laser Spectrometer Coupled with Grazing Angle Probe

2019 ◽  
Vol 519 ◽  
pp. 012007 ◽  
Author(s):  
J L Ruiz-Caballero ◽  
L A Blanco-Riveiro ◽  
I A Ramirez-Marrero ◽  
L A Perez-Almodovar ◽  
A M Colon-Mercado ◽  
...  
Keyword(s):  
Quantum Cascade Laser ◽  
Grazing Angle ◽  
Laser Spectrometer ◽  
Quantum Cascade ◽  
Angle Probe

Characterization of a near-room-temperature, continuous-wave quantum cascade laser for long-term, unattended monitoring of nitric oxide in the atmosphere

2006 ◽  
Vol 31 (13) ◽  
pp. 2012 ◽  
Author(s):  
David D. Nelson ◽  
J. Barry McManus ◽  
Scott C. Herndon ◽  
Joanne H. Shorter ◽  
Mark S. Zahniser ◽  
...  
Keyword(s):  
Nitric Oxide ◽  
Quantum Cascade Laser ◽  
Room Temperature ◽  
Continuous Wave ◽  
Quantum Cascade
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