Tapered 4.7 μm quantum cascade lasers with highly strained active region composition delivering over 4.5 watts of continuous wave optical power, /Arkadiy Lyakh, Richard Maulini, Alexei Tsekoun, Rowel Go and C. Kumar N. Patel, Optics Express 20 (4) 4382-4387 (2012).

λ~7.1 μm quantum cascade lasers with 19% wall-plug efficiency at room temperature, Richard Maulini, Arkadiy Lyakh, Alexei Tsekoun and C. Kumar N. Patel, Optics Express, 19, 17203-17211 (2011).

High average power uncooled mid-wave infrared quantum cascade lasers, R. Maulini, A. Lyakh, A. Tsekoun, R. Go and C. Kumar N. Patel, Electronics Letters, 47, 395-396, 2011 (Editorial featuring the importance of the advance: "QCLs keep their cool", Electronics Letters, 47, 355, 2011).

High Performance Continuous-Wave Room Temperature 4.0 µm Quantum Cascade Lasers with Single-Facet Optical Emission Exceeding 2 Watts, A. Lyakh, R. Maulini, A. Tsekoun, R. Go, S. Von der Porten, C. Pflügl, L. Diehl, Federico Capasso and C. Kumar N. Patel, Proceedings of the National Academy of Sciences 107, 18799-18802 (2010).

Multi-watt Level Short Wavelength Quantum Cascade Lasers, Arkadiy Lyakh, Richard Maulini, Alexei G. Tsekoun, Rowel Go and C. Kumar N. Patel, Proceedings of the SPIE, 7953, 79531L-1 – 79531-L10 (2011).

Activation energy study of electron transport in high performance short wavelength quantum cascade lasers, Christian Pflügl, Laurent Diehl, Arkadiy Lyakh, Qi Jie Wang, Richard Maulini, Alexei Tsekoun, Xiaojun Wang, Federico Capasso and C. Kumar N. Patel, Optics Express 18, 746-753 (2010).

From CO2 Lasers to Quantum Cascade Lasers – A Saga of High Power Infrared Lasers, C. Kumar N. Patel, J. Laser Appl. 21, 224-238 (2010).

Standoff detection of explosive substances at distances of up to 150m, Anadi Mukherjee, Steven Von der Porten and C. Kumar N. Patel, Appl. Opt. 49, 2072-2078 (2010).

Electromagnetically Induced Gain in Molecular Systems, Nandini Mukherjee and C. Kumar N. Patel, Phys Rev A 80, 063830 (2009).

High power, high efficiency quantum cascade laser systems for directional infrared countermeasures and other defense and security applications, Richard Maulini, Arkadiy Lyakh, Alexei G. Tsekoun, Rowel Go, Michael Lane, Tyson Macdonald and C. Kumar N. Patel, Proceedings of the SPIE, 7483, 74830D-1 – 74830D-9 (2009).

Laser Based In-Situ and Standoff Detection of Chemical Warfare Agents and Explosives, C. Kumar N. patel, Proceedings of SPIE 7484, 748402-1 – 748402-14 (2009).

High power thermoelectrically cooled and uncooled quantum cascade lasers with optimized reflectivity facet coatings, Richard Maulini, Arkadiy Lyakh, Alexei Tsekoun, Rowel Go, Christian Pflügl, Laurent Diehl, Federico Capasso, and C. Kumar N. Patel, Applied Physics Letters 95, 151112 (2009).

3 W continuous-wave room temperature single-facet emission from quantum cascade lasers based on nonresonant extraction design approach, A. Lyakh, R. Maulini, A. Tsekoun, R. Go, C. Pflügl, L. Diehl, Q. J. Wang, Federico Capasso, and C. Kumar N. Patel, Applied Physics Letters 95, 141113 (2009).

Widely tunable high-power external cavity quantum cascade laser operating in continuous-wave at room temperature, R. Maulini, I. Dunayevskiy, A. Lyakh, A. Tsekoun, C.K.N. Patel, L. Diehl, C. Pflügl, and F. Capasso, Electronics Letters 45,< 107 (2009).

Molecular Fine Structure and Transition Dipole Moment of NO2 Using an External Cavity Quantum Cascade Laser, Nandini Mukherjee and C. Kumar N. Patel, Chem. Phys. Lett. 462, 10 (2008).

1.6 Watt, High Wallplug Efficiency, Continuous-Wave Room Temperature Quantum Cascade laser Emitting at 4.6 µm, Arkadiy Lyakh, C. Pflügl, L. Diehl, Q. J. Wang, Federico Capasso, X. J. Wang, J. Y. Fan, T. Tanbun-Ek, R. Maulini, A. Tsekoun, R. Go and C. Kumar N. Patel, Applied Physics Letters 92, 111110 (2008).

Laser Photoacoustic Spectroscopy Helps Fight Terrorism: High Sensitivity Detection of Chemical Warfare Agent and Explosives, C. Kumar N. Patel, The European Physical Journal, Special Topics 153, 1-18 (2008).

Linewidth Measurement of External Grating Cavity Quantum Cascade Laser Using Saturation Spectroscopy, (with Nandini Mukherjee, R. Go and C. Kumar N. Patel), Applied Physics Letters 92, 111116 (2008).

Optically Multiplexed Multi-gas Detection using Quantum Cascade Laser Photoacoustic Spectroscopy, Anadi Mukherjee, Manu Prasanna, Rowel Go, Ilya Dunayevskiy, Alexei Tsekoun and C. Kumar N. Patel, Applied Optics 47, 4884-4887 (2008).

Sub-ppb Level Detection of Dimethyl Methyl Phosphonate (DMMP) Using Quantum Cascade Laser Photoacoustic Spectroscopy, Anadi Mukherjee, Ilya Dunayevskiy, Manu Prasanna, Rowel Go, Alexei Tsekoun, Xiaojun Wang, Jenyu Fan and C. Kumar N. Patel, Applied Optics 47, 1543 (2008).

Intersubbed absorption of quantum cascade laser structures in the high differential resistance voltage range and its application to laser modulation, A. Lyakh, R. Maulini, A. Tsekoun, R. Go and C. Kumar N. Patel, Applied Physics Letters 92, 211108 (2008).

Room-temperature continuous-wave operation of long wavelength (λ =9.5 µm) MOVPE-grown quantum cascade lasers, C. Pflügl, L. Diehl, A. Tsekoun, R. Go, X. Wang, J. Fan, T. Tanbun-Ek, F. Capasso and C. Kumar N. Patel, Electronics Letters 43, 1025-1026 (2007).

High Sensitivity Detection fo Triacetone Triperoxide (TATP) and Its Preceursor Acetone, Ilya Dunayevskiy, Alexei Tsekoun, Manu Prasanna, Rowel Go and C. Kumar N. Patel, Applied Optics 46, 6397-6404 (2007).

Sensitive Detection of TNT, Michael Pushkarsky, Ilya Dunayevskiy, Manu Prasanna, Alexei Tsekoun, Rowel Go and C. Kumar N. Patel, Proc. Nat. Acad. Sciences 103, 19630-19634 (2006).

Sub-parts-per-billion level detection of NO2 using room temperature quantum-cascade lasers, Michael Pushkarsky, Alexei Tsekoun, Illya G. Dunayevskiy, Rowell Go and C. Kumar N. Patel, Proceedings of the National Academy of Sciences 103, 10846-10849 (2006).

Improved performance of quantum cascade lasers through a scalable, manufacturable epitaxial-side-down mounting process, Alexei Tsekoun, Rowell Go, Michael Pushkarsky, Manijeh Razeghi and C. Kumar N. Patel, Proceedings of the National Academy of Sciences 103, 4831-4835 (2006).

High-sensitivity high-selectivity detection of chemical warfare agents, Michael B. Pushkarsky, Michael E. Webber, Tyson Macdonald and C. Kumar N. Patel, Applied Physics Letters 88, 044103 (2006).

Agricultural ammonia sensor using diode lasers and photoacoustic spectroscopy, Michael E. Webber, Tyson Macdonald, Michael B. Pushkarsky, C. Kumar N. Patel, Yongjing Zhao, Nichole Marcillac, and Frank M. Mitloehner, Institute of Physics Publishing, Meas. Sci. Technol. 16 1547-1553 (2005).

Optical detection of chemical warfare agents and toxic industrial chemicals: Simulation, Michael E. Webber, Michael B. Pushkarsky and C. Kumar N. Patel, Journal of Applied Physics 97, 113101 (2005).

High Sensitivity Photoacoustic Detection of Chemical Warfare Agents, M. B. Pushkarsky, M. E. Webber, T. Macdonald and C. Kumar N. Patel, Optically Based Biological and Chemical Sensing for Defence, John C. Carrano and Arturo Zakauskas, Eds., Proceedings of SPIE, Vol. 5617, 128-135 (2004).

Optical Detection of Chemical Warfare Agents and Toxic Industrial Chemicals, M. B. Pushkarsky, M. E. Webber and C. Kumar N. Patel, Optically Based Biological and Chemical Sensing for Defence, John C. Carrano and Arturo Zakauskas, Eds., Proceedings of SPIE, Vol. 5617, 34-45 (2004).

Ultra-Sensitive Ambient Ammonia Detection Using CO2 Laser Based Photoacoustic Spectroscopy, M. B. Pushkarsky, M. E. Weber and C. K. N. Patel, Applied Physics B 77, 381-385 (2003).

Ultra-Sensitive Gas Detection Using Diode Lasers And Resonant Photoacoustic Spectroscopy, Michael E. Webber, Michael B. Pushkarsky and C. K. N. Patel, Diode Lasers and Applications in Atmospheric Sensing, Alan Fried, Editor, Proceedings of SPIE, Vol. 4817, 111—122 (2002).

Optical-nose technology competes with breath analyzers and blood tests, C. Kumar Patel and Eric Mueller, Laser Focus World, Vol. 38, No. 11, 83-88 (November 2002).

Fiber-amplifier-enhanced photoacoustic spectroscopy with near-infrared tunable diode lasers, Michael E. Webber, Michael Pushkarsky, and C. Kumar N. Patel, Applied Optics 42(12), April 20, 2003, pp. 2119-2126.

Laser-based photoacoustic ammonia sensor for industrial applications M.B. Pushkarsky, M.E. Webber, O. Baghdassarian, L.R. Narasimhan. C.K.N.Patel, Applied Physics B special issue: Trends in Laser Sources, Spectroscopic Techniques and Their Applications to Trace Gas Detection, 75 (2-3), 391-396, (September 2002).

Sensitive Analysis of Breath gases for "Bloodless Blood Test", C. Kumar N. Patel, Gases & Technology, Vol. 1, No. 3, 24-30, (May/June 2002).

Correlation of breath ammonia with blood urea nitrogen and creatinine during hemodialysis, L. R. Narasimhan, William Goodman, and C. Kumar N. Patel, Proceedings of the National Academy of Sciences 98, 4617-4621 (2001).

Laser Techniques for Measurements of NO, NH3, and other Constituents in Human Breath, L. R. Narasimhan, William Goodman and C. Kumar N. Patel, in The Biology of Nitric Oxide, Part 7, Eds. S. Moncada, L. E. Gustafsson, N. P. Wiklund, and E. A. Higgs (Portman Press, London 2000) p. 27.