scholarly journals Fiber optic coupled quantum cascade infrared laser system for detection of explosive materials on surfaces

2019 ◽  
Vol 119 ◽  
pp. 105635 ◽  
Author(s):  
Kevin J. Major ◽  
L. Brandon Shaw ◽  
Lynda Busse ◽  
Rafael Gattass ◽  
David Arnone ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Laser System ◽  
Infrared Laser ◽  
Quantum Cascade ◽  
Explosive Materials

First experiences with a 2.0-μm near infrared laser system for neuroendoscopy

2007 ◽  
Vol 30 (3) ◽  
pp. 195-201 ◽  
Author(s):  
H. C. Ludwig ◽  
T. Kruschat ◽  
T. Knobloch ◽  
H.-O. Teichmann ◽  
K. Rostasy ◽  
...  
Keyword(s):  
Near Infrared ◽  
Laser System ◽  
Infrared Laser

Automated Multi-Diode Laser System for WDM Couplers Insertion Loss Measurements

2012 ◽  
Vol 2 (3) ◽  
pp. 1-7 ◽  
Author(s):  
Sami D. Alaruri
Keyword(s):  
Standard Deviation ◽  
Measurement System ◽  
Insertion Loss ◽  
Fiber Optic ◽  
Laser System ◽  
Internal Standards ◽  
Loss Measurement ◽  
Passive Fiber ◽  
Optical Attenuators ◽  
Variable Optical Attenuators

Insertion loss is an important parameter used to characterize passive fiber-optic components, such as WDM couplers and variable optical attenuators. This article describes an automated insertion loss measurement system which incorporates 980 nm, 1310 nm, 1529 nm and 1561 nm DFB lasers and two internal fiber optic standards. Insertion loss measurements collected with the system for WDM couplers and internal standards are presented. The system repeatability was validated by measuring the insertion loss for a WDM coupler six times at 980 nm, 1310 nm, 1529 nm and 1561 nm over 3 days period. The standard deviation calculated for the insertion loss measurements is less than 0.11 dB and the %CV is less than 1%.

Laser Trace Vaporization of Trace Explosive Materials

2012 ◽  
Vol 1405 ◽  
Author(s):  
Michael Papantonakis ◽  
Robert Furstenberg ◽  
Christopher A. Kendziora ◽  
Viet Nguyen ◽  
Jakob Großer ◽  
...  
Keyword(s):  
Energetic Materials ◽  
Direct Detection ◽  
Spectroscopic Properties ◽  
Solid Particles ◽  
Absorption Bands ◽  
Kinetic Measurements ◽  
Ion Mobility Spectrometer ◽  
Quantum Cascade ◽  
Explosive Materials ◽  
Vapor Sampling

ABSTRACTThe low vapor pressure of many energetic materials presents a challenge for detection by non-contact methods. We address this limitation by illuminating energetic materials including TNT and RDX with infrared lasers tuned to strong molecular absorption bands to efficiently heat trace amounts present on substrates. This substantially increases their vapor signatures for direct detection, obviating the need to swab surfaces for solid particles or to collect headspace vapors for extended time periods. The instantaneously generated vapor produced by Laser Trace Vaporization (LTV) can be detected by any number of techniques which can accommodate vapor sampling or spectroscopic analysis. Currently the testbed for LTV incorporates a tunable quantum cascade laser (QCL) to illuminate the sample and an ion mobility spectrometer (IMS) to validate the signal enhancement. The LTV technique works well with all tested substrates, though the thermal and spectroscopic properties of the substrate can influence the efficiency of the vaporization. Computational results from laser heating along with experimental thermal kinetic measurements were used to optimize LTV laser irradiation parameters. In addition to a range of LTV results for different explosives and substrates, we explore the effects of wavelength-dependent heating on the sample and substrate.

Submillimetre-wave lines of H 2 D + and D 2 H + as probes into chemistry in cold dark clouds

2006 ◽  
Vol 364 (1848) ◽  
pp. 2943-2952 ◽  
Author(s):  
Takayoshi Amano
Keyword(s):  
Recent Progress ◽  
Laser System ◽  
Far Infrared ◽  
Infrared Laser ◽  
Effective Hamiltonian ◽  
Dark Clouds ◽  
Far Infrared Laser ◽  
Spectroscopic Investigations ◽  
Thz Range ◽  
Submillimetre Wave

We discuss past and recent progress of our continuing project of submillimetre-wave spectroscopic investigations of H 2 D + and D 2 H + . Three new lines of H 2 D + in the 2.5–3.5 THz range are measured with a tunable far-infrared laser system. Since these molecules are very light asymmetric molecules, analysis based on a conventional effective Hamiltonian is not very useful in predicting the transition frequencies to the accuracy of the order of several MHz or better. In this respect, any addition of new accurate measurements of transition frequencies is important. In this paper, some discussions will be made on and its deuterated species as probable interstellar species in cold dark clouds. In particular, , which is predicted to be abundant in cold dark clouds, can be (indirectly) detected by observing .

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