MWIR and LWIR QCLs as a Game Changers in Defence and Homeland Security Applications, C. Kumar N. Patel, MIOMD-XI: 11th International Conference on Infrared Optoelectronics: Materials and Devices, Evanston, IL, September 6, 2012.

High Power Infrared QCLs: Advances and Applications, C. Kumar N. Patel, Photonics West, San Francisco, CA January 22, 2012.

Quantum cascade lasers: a game changer for defense and homeland security IR photonics, C. Kumar N. Patel, Keynote presentation, SPIE Defense, Security, and Sensing Symposium, Orlando, FL, 29 Apr 2011.

MWIR and LWIR Quantum Cascade Lasers for Defense and Security Applications, C. Kumar N. Patel, Opto Tech, Tel Aviv, Israel, March 15, 2012.

Lasers Then and Now – Promises, Progress and the Future, C. Kumar N. Patel, ICALEO Closing Plenary Session, Anaheim, CA, September 30, 2010.

High Power Infrared Lasers: From CO2 Lasers to Quantum Cascade Lasers, C. Kumar N. Patel, IEEE San Fernando Chapter, October 28, 2010.

Lasers Then and Now – Promises, Progress and the Future, C. Kumar N. Patel, ICALEO Closing Plenary Session, Anaheim, CA, September 30, 2010.

Laser Based Sensors for in situ and Standoff Detection of Explosives, Chemical Warfare Agents and Toxic Industrial Chemicals, C. Kumar N. Patel, Advanced Photonics and Renewable Energy: 2010 Optics & Photonics Congress, Karlsruhe, Germany, June 21, 2010.

50 Years of Lasers: An Inventor's Perspective on High-Power IR Lasers and the Laser Marketplace, C. Kumar N. Patel, Lasers and Photonics Marketplace, Photonics West, San Francisco, January 25, 2010.

Laser photoacoustic spectroscopy for chemical detection, C. Kumar N. Patel, SPIE Europe 2009 Security & Defence International Symposium, Berlin, Germany. Invited paper #7484-1, September 1, 2009.

High Power Continuous-Wave Room Temperature Quantum Cascade Lasers, C. Pflügl, L. Diehl, Q. J. Wang, and Federico Capasso, A. Lyakh, R. Maulini, A. Tsekoun, R. Go, and C. Kumar N. Patel, X. J. Wang, J. Y. Fan, and T. Tanbun-Ek, Invited Paper 7230-35, Photonics West 2009; Wednesday, 28 January, 2009.All About Infrared Lasers and Applications, C. Kumar N. Patel, Conference Inaugural Presentation at Photonics 2008, New Delhi, India, December 14, 2008.

Detection of CWAs, TICs and Explosives using QCL-based Photoacoustic Techniques or QCLs for Fighting Terrorism, C. Kumar N. Patel, SPIE Europe Security and Defence (SPIE Conference 7116) Cardiff, Wales, September 16, 2008.

From Gas Lasers and Tunable Raman Lasers to Quantum Cascade Lasers, C. Kumar N. Patel, 2008 Frontiers in Optics (Annual Meeting of the Optical Society of America, Rochester, NY), October 20, 2008.

Laser Photoacoustic Spectroscopy Helps Fight Terrorism: High Sensitivity Detection of Chemical Warfare Agents and Explosives, C. Kumar N. Patel, Princeton-TAMU Symposium, Princeton University, NJ, March 17, 2007.

Laser Photoacoustic Spectroscopy Helps Fight Terrorism: High Sensitivity Detection of Chemical Warfare Agents and Explosives, C. Kumar N. Patel, The 2007 ICPPP Prize Paper, 14th International Conference on Photoacoustic and Photothermal Phenomena, Cairo, Egypt, January 6-9, 2007.

Future of Sensors & Sensor Systems, C. Kumar N. Patel, All-India Management Association, 33rd National Management Convention, New Delhi, India, October 6-7, 2006.

High Sensitivity Detection of CWAs and Explosives using Tunable Quantum Cascade Laser Photoacoustic Spectroscopy (Finding Tiny Needles in Large Haystacks), C. Kumar N. Patel, Optics & Photonics in Defense & Security SPIE Europe, Stockholm, Sweden, September 12, 2006.

Tunable Laser Photoacoustic Spectroscopy: Searching for Tiny Needles in a Large Haystack, C. Kumar N. Patel, CLEO/QELS, Long Beach, CA, May 26, 2006.

Confessions of a Laser Jock, C. Kumar N. Patel, Security & Defense Conference Lifetime Achievement Award Presentation, Defense & Security Symposium 2006, Orlando, FL, April 19, 2006.

Looking for and Finding Needles in Haystacks - Optical Detection of CWA and Other Agents, C. Kumar N. Patel, Biophotonic Sensors and Smart Fiber Optic Sensor Networks Workshop, Optoelectronics Industry Development Association, Rochester, NY, August 17-18, 2005.

Optical Techniques for High Sensitivity, High Reliability Sensing of Chemical Warfare Agents: Looking for a Needle in a Haystack, C. Kumar N. Patel, Gordon Research Conference on Photoacoustic & Photothermal Phenomena, ICTP, Trieste, Italy, June 27 - July 1, 2005.

Optical Detection of Chemical Warfare Agents and Toxic Industrial Chemicals, C. Kumar N. Patel, M. B. Pushkarsky, T. Macdonald and M. E. Webber, GOMACTech-05, Las Vegas, NV, April 7, 2005.

Performance of Optical Detection of CWAs and TICs: CO2 lasers to QCLs, C. Kumar N. Patel, M. B. Pushkarsky and M. E. Webber, MTO/DARPA Symposium, San Francisco, CA, November 30 - December 2, 2004.

Optical Detection of Chemical Warfare Agents, Michael E. Webber, Michael B. Pushkarsky and C. Kumar N. Patel, Optically Based Biological and Chemical Sensing for Defence (SPIE Europe) London (October 25-28, 2004).

Photoacoustic Detection of Chemical Warfare Agents and Toxic Industrial Chemicals, C. Kumar N. Patel, 13th International Conference on Photoacoustic and Photothermal Phenomena, Rio de Janeiro, Brazil, (July 5-8, 2004).

Field Study: Intercomparison of Two Continuous Ammonia Monitors, D. Kenski, M.B. Pushkarsky, M.E. Webber, C.K.N. Patel, and P. Dasgupta, Ammonia Workshop , National Atmospheric Deposition Program's AmmoniaWorkshop, Washington, D.C., October 22-24, 2003.

Infrared Lasers: Then and Now, C. Kumar N. Patel, ICALEO 2000 Dearborn, MI, October 2-5, 2000.

Industry-Science Interface: Are There Successful Models? C. Kumar N. Patel, Benchmarking Industry-Science Relationships, Joint German-OECD Conference, Berlin, Germany, October 16-17, 2000.