Coherent light generators – Particular beam control device – Optical output stabilization
Reexamination Certificate
2011-03-08
2011-03-08
Harvey, Minsun (Department: 2828)
Coherent light generators
Particular beam control device
Optical output stabilization
C372S029014, C372S097000
Reexamination Certificate
active
07903704
ABSTRACT:
Methods and apparatus for broad tuning of single wavelength quantum cascade lasers and the use of light output from such lasers for highly sensitive detection of trace gases such as nitrogen dioxide, acetylene, and vapors of explosives such as trinitrotoluene (TNT) and triacetone triperoxide (TATP) and TATP's precursors including acetone and hydrogen peroxide. These methods and apparatus are also suitable for high sensitivity, high selectivity detection of other chemical compounds including chemical warfare agents and toxic industrial chemicals. A quantum cascade laser (QCL) system that better achieves single mode, continuous, mode-hop free tuning for use in L-PAS (laser photoacoustic spectroscopy) by independently coordinating gain chip current, diffraction grating angle and external cavity length is described. An all mechanical method that achieves similar performance is also described. Additionally, methods for improving the sensor performance by critical selection of wavelengths are presented.
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Dunayevskiy Ilya
Go Rowel C.
Maulini Richard
Patel C. Kumar N.
Prasanna Manu
Cislo & Thomas LLP
Harvey Minsun
King Joshua
Pranalytica, Inc.
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