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Presentations:

1. Dirk Richter, David G. Lancaster, Robert F. Curl, Frank K.Tittel, Walter Neu: "All-Diode Pumped Difference Frequency Spectrometer Employing Bulk Periodically Poled Lithium Niobate (PPLN)", OSA Annual Meeting, paper ThVV4, 1998

2. D. Richter, D.G. Lancaster, R.F. Curl, F.K. Tittel, "Tunable, fiber coupled spectrometer based on difference-frequency generation in periodically poled lithium niobate," Advanced Solid-State Lasers (ASSL) - Technical Digest, Paper WC-5, pp.371-373, Boston (1999)

3. Dirk Richter, David G. Lancaster, Robert F. Curl, Frank K.Tittel: "In situ multi-component trace gas measurements with a fiber coupled, mid-infrared difference-frequency mixed laser sensor," OSA Annual Meeting, Paper WP4 (September, 1999)


4. Dirk Richter, David G. Lancaster, Frank K. Tittel: "Development of an automated multi-species gas sensor using diode laser pumped difference-frequency generation", Conference on Lasers and Electro-Optics, San Francisco, Paper CThM64 (May 2000)


5. D. Richter, F.K. Tittel, J. Bahr, D. Wickham, J. Wright, J.C. Graf: "Diode Laser Based Formaldehyde Measurements in a Catalytic Trace Contaminant Control System", International conference on Environmental Systems - ICES, Toulouse, France, paper 00ICES-138 (July 2000)

6. D. Richter, F. V. Englich, F. K. Tittel, N. Matsuoka, S. Yamaguchi, T. Fujioka, "Fiber laser pumped difference frequency based mid-IR for ammonia detection," OSA Annual Meeting, Providence, RI, Paper ThU53 (October 2000)

7. D. Richter, D. Rehle, F.K. Tittel, C. Oppenheimer, H. J. Duffell, R.L Jones, M. R. Burton, "Volcanic gas emission measurements using tunable mid-IR DFG based sensors," OSA Annual Meeting, Providence, RI, Paper ThH4 (October 2000)

8. Dirk Richter, Miklos Erdelyi, Frank K. Tittel, “Ultra-Compact Mid-IR Spectroscopic Source Based on Frequency Converted Yb –Er/Yb Fiber Amplified CW Diode Laser,” OSA Advanced Solid State Lasers (ASSL), Paper MB10, Seattle (2001)

9. Dirk Richter, Alan Fried, and Frank K. Tittel, "Portable Laser Based Mid-IR Gas Sensors: Development and Real-World Applications," Invited Talk, American Chemical Society, Annual Meeting, Chicago, Il (August 30, 2001)

10. Dirk Richter and Alan Fried, “Tunable Difference Frequency Based Mid-IR Laser Sources: Trends, Advances and Spectroscopic Gas Sensing Applications,” Seminar, Fundamental Science Division, Pacific Northwest National Laboratories (PNNL), November 7, 2001

11. Dirk Richter, Alan Fried, Geoffrey S. Tyndall, Eduardo Oteiza, Miklos Erdelyi, and Frank K. Tittel, “Tunable telecom diode laser based mid-IR source at 2.64 microns,” Advanced Solid State Laser (ASSL) conference, Quebec City, February 3-6, 2002

12. Dirk Richter, Alan Fried, Geoffrey S. Tyndall, Eduardo Oteiza, Miklos Erdelyi, and Frank K. Tittel, “All-telecom diode laser based mid-IR source for spectroscopic detection of HF, H2O, and HDO,” Laser Applications to Chemical and Environmental Analysis (LACEA), Boulder, CO, February 7-10, 2002

13. D. Richter, A. Fried, F. K. Tittel,“Tunable optical fiber pumped difference-frequency laser sources: state of the art,” Invited Talk, Diode Laser and Applications in Atmospheric Sensing [4817-20] , 47th SPIE Annual Meeting, July 11, 2002

14. D. Richter and A. Fried, “Laser Spectroscopy for Atmospheric Measurements: Past, Present and Future,“ GKSS Forschungszentrum, Geesthacht, August 19, 2002, Germany

15. Dirk Richter, Alan Fried, Christoph Dyroff, James G. Walega, “Analytical Photonics for High Precision Mid Infrared Trace Gas Sensing,” Invited Talk, International Tunable Diode Laser Spectroscopy Conference, Zermatt, Switzerland, July 17, 2003

16. Dirk Richter, Alan Fried, Christoph Dyroff, and James G. Walega, “Spectroscopic performance evaluation of optical fiber amplified coherent diode and fiber laser sources for difference frequency generation,” Laser Applications to Chemical and Environmental Analysis (LACEA), Annapolis, MD, February 7-10, 2002

17. Dirk Richter, Petter Weibring, and Alan Fried, “Design and performance of fiber pumped difference frequency sources for atmospheric studies,” Invited Talk, Laser Science XX Conference, Rochester, NY, October 10-14, 2004

18. Dirk Richter, “Development and Progress of Difference Frequency Mid-IR laser sources for Atmospheric Studies,” Rocky Mountain Section of the Optical Society of America, Invited Seminar, Boulder, CO (October 21, 2004)

19. Dirk Richter, P.Weibring, A.Fried, J.G. Walega, "Tunable Infrared Laser Sources for Atmospheric Sensing: Development and Application," Invited Talk, 2nd Symposium for Infrared Materials and Technologies, State College, PA November 21-22, 2005

20. Dirk Richter, P. Weibring, A. Fried, J.G. Walega,"Progress on DFG laser sources and its application to ultra-sensitive trace gas detection," Invited Talk, Laser Applications for Chemical, Security, and Environmental Analysis (LACSEA), Incline Village, NV, February 5-9 , 2006

21. Dirk Richter, Petter Weibring, Alan Fried, O. Tadanaga, Y. Nishida, M. Asobe, H. Suzuki, “15 mW, Tunable Difference Frequency Generation Source for Absorption Spectroscopy,” Conference on Lasers and Electro-Optics, Baltimore (May 7-10, 2007)

22. D. Richter, J.G. Walega, P. Weibring, A. Fried, and M. Trainer, “Preliminary results of formaldehyde measurements during TexAQS 2006,” NOAA workshop, Austin, TX (May 29-31, 2007)

23. Dirk Richter, Bryan P. Wert, Petter Weibring, James G. Walega, Alan Fried, “High-Precision Carbon Isotope Laser Absorption Spectrometer (CILAS),” 2nd International Workshop on Stable Isotope Ratio Infrared Spectrometry, Florence, Italy (September 7/8, 2007)

24. D. Richter, P. Weibring, A. Fried, J.G. Walega, O. Tadanaga, M. Asobe, and H. Suzuki, "Mid-infrared QPM laser sources for high-precision atmospheric trace gas measurements," Invited Talk, SPIE Symposium on Lasers and Applications in Science and Engineering, 6875-18, San Jose (January 22, 2008)

Contributed Presentations:

1. D.G. Lancaster, D. Richter, J.C. Graf, R.F. Curl, and F.K. Tittel, "Laser Based Absorption Sensor for Trace Gas Monitoring in a Spacecraft Environment," Laser Applications to Chemical and Environmental Analysis 1998, March 9-11, Florida


2. David G. Lancaster, Frank K. Tittel, Dirk Richter, Konstantin P. Petrov, and Robert F. Curl, "Tunable Mid-Infrared Laser Based Gas Sensors: New Technologies and Applications," Invited Talk, Category 10, Conference on Lasers and Electro-Optics (1998)


3. C.Babich, D.G.Lancaster, H.Zhao, D. Richter, R.F. Curl, F.K.Tittel, "Compact Diode Laser Based Sensor for Detection of Atmospheric Methane," OSA Annual Meeting, Baltimore, MD (1998)


4. F.K. Tittel, D.G. Lancaster, D.Richter, and R.F. Curl, "Mid-infrared Sensors using Periodically Poled LiNbO3 for Trace Gas Detection," Invited Talk, Paper Number CTuH1, Conference on Lasers and Electro-Optics – Europe, Glasgow, 1998


5. D.G. Lancaster, D. Richter, R.F. Curl, F.K. Tittel,"Compact fiber coupled gas sensor tunable from 3.3 to 4.4 μm," Conference on Lasers and Electro-Optics, Paper CTuS4 - Baltimore (May 1999)


6. F.K. Tittel, D.G. Lancaster, D. Richter, R.F. Curl, "Robust broadly tunable mid-infrared spectrometer based on difference-frequency generation for gas sensing applications," Conference on Lasers and Electro-Optics - Europe, Paper LWA4, Munich (June 1999)


7. F.K. Tittel, D.G. Lancaster, D. Richter, R.F. Curl, "Laser based absorption sensors for trace gas monitoring in a spacecraft habitat," 29th International Conference on Environmental Systems, Paper Number 99ES-102 - Denver (July 1999)


8. F.K. Tittel, D.G. Lancaster, D. Richter (Rice Univ.); L. Goldberg, J. Koplow (Naval Research Labs), "Compact mid-infrared trace gas sensors based on difference-frequency mixing," 44th SPIE Annual Meeting, Paper 3758-02 (July 1999)


9. D. G. Lancaster, D. Richter, R.F. Curl, F.K. Tittel, "Diode lasers, DFG and Molecules," Advanced Semiconductor Lasers and Their Applications - Technical Digest, Paper AThC2, pp.135-137, Santa Barbara (July 1999)


10. F.K. Tittel, D.G. Lancaster, D. Richter, R.F. Curl "Novel Diode Laser Based Sensors for Gas Sensing Applications," 8th International Workshop on Laser Physics (LPHYS'99) - Budapest, (July 1999)

11. Frank K. Tittel, David G. Lancaster, Dirk Richter, Robert F. Curl, "Mid-infrared difference frequency trace gas sensors: from the laboratory to the real world," OSA Annual Meeting, Invited Paper WP1 (September, 1999)


12. Rene Weidner, David G. Lancaster, Dirk Richter, Frank K. Tittel (Rice Univ.), Jens Limpert, Holger Zellmer, Andreas Tuennermann (Friedrich Schiller Univ. Jena), "Compact CH4 trace gas sensor using fiber coupled difference-frequency generation at 3.3 microns," OSA Annual Meeting, Poster TuXX45 (September, 1999)


13. F.K. Tittel, D.G. Lancaster, D. Richter, "Compact high power mid-IR spectroscopic source based on difference frequency generation in PPLN," Advanced Solid State Lasers (ASSL), Paper TuA5, Davos (2000)


14. R. Claps, F.V. Englich, D. Richter, R.F. Curl, F.K. Tittel, "Ammonia detection in a bio-reactor system using diode laser spectroscopy at 1.53 microns," OSA Annual Meeting, Paper ThU56 (October 2000)

15. Frank K. Tittel, Dirk Richter, Miklos Erdelyi, Clive Oppenheimer, Hayley J. Duffell, Rodney L. Jones, Mike Burton, “Volcanic gas emission measurements using tunable mid-IR diode laser based spectrometers,” International Workshop on Optical Methods in Earth Sciences, Napoli, Italy (March 2001)

16. Frank K. Tittel, R. Claps, M. Erdelyi, A. Kosterev, D. Richter, R. F. Curl, “Diode and quantum cascade laser based spectroscopic sources for trace gas detection,” 4th International Optoelectronics Materials and Devices (MIOMD), Montepellier, France, (April 2001)

17. F.K. Tittel, R. Claps, M. Erdelyi, A Kosterev, D. Richter, R.F. Curl, “Environmental and chemical sensing applications of diode and quantum cascade laser based gas sensors,” Invited Talk, Conference on Lasers and Electro-Optics, Baltimore, MD (May 2001)

18. David G. Lancaster, Frank K. Tittel, Dirk Richter, “Spectroscopic applications of QPM devices,” Invited Talk, CLEO Pacific Rim, Chiba, Japan (July 2001)

19. F.V. Englich, R. Claps, D. Richter, J.C. Graf, W. Neu, R.F. Curl, F.K. Tittel, “Ammonia detection using near infrared diode laser based overtone spectroscopy at 1.53 microns,” submitted to 7th European Conference on Atomic And Molecular Physics (ECAMP VII), Technische Universität Berlin, April 2-6, 2001

20. A. Fried, B. P. Wert, J. G. Walega, D. Richter, “Airborne measurements of formaldehyde employing a high-performance tunable diode laser absorption system,” Diode Laser and Applications in Atmospheric Sensing [4817-19] , 47th SPIE Annual Meeting, July 11, 2002

21. J. F. Kelly, R. L. Sams, S. W. Sharpe, R.S. Disselkamp, T. A. Blake, D. Richter, A. Fried, “Optimization of cw-QC lasers for Doppler and sub-Doppler molecular spectroscopy,” Diode Laser and Applications in Atmospheric Sensing [4817-06] , 47th SPIE Annual Meeting, July 10, 2002

22. Christoph Dyroff, Alan Fried, Dirk Richter, James G. Walega, Mark S. Zahnizer, and Barry McManus, “Design and performance assessment of a stable astigmatic Herriott cell for trace gas measurements on airborne platforms,” Laser Applications to Chemical and Environmental Analysis (LACEA), Annapolis, MD, February 7-10, 2002

23. Alan Fried, James Walega, Bryan Wert, James Crawford, William Potter, Ian Faloona, and Dirk Richter, “Highly sensitive airborne measurements of CH2O during NASA’s 2001 Trace-P campaign: Measurement box-model comparisons and the effect of clouds on these comparisons,” International Tunable Diode Laser Spectroscopy Conference, Zermatt, Switzerland, July 15, 2003

24. P. Weibring, D. Richter, A.Fried, J. Walega, “Ultra-high precision trace gas detection using difference-frequency generation sources,” Conference on Lasers and Electro-Optics, Baltimore, MD (May 2005)

25. C. Roller, F. K. Tittel, A. Fried, P. Weibring, J. Walega, D. Richter, “Advances in the Performance Assessment of a Tunable Diode Laser Absorption Spectrometer for Airborne Measurements of CH2O,“ Conference on Lasers and Electro-Optics, Paper CTuGG3, Baltimore, MD (May 2005)

26. Petter Weibring, Dirk Richter, Alan Fried, and James G. Walega, “Compact tunable mid-IR spectrometer for ultra sensitive formaldehyde measurements,” 5th International Conference Tunable Diode Laser Spectroscopy, Florence, Italy (July 11-15, 2005)

27. A. Fried, D. Richter, P. Weibring, J.G. Walega, C.Roller, F.K. Tittel, and C. Dyroff, “Lead-Salt and Difference-Frequency Generation IR Spectrometers: Performance Comparisons and Common Requirements for Ultra Sensitive Airborne Measurements,” Invited Talk, 5th International Conference Tunable Diode Laser Spectroscopy, Florence, Italy (July 11-15, 2005)

28. Fried, A., P. Weibring, D. Richter, J. Walega, C. Roller, and F. Tittel,  “Tunable Diode Laser and Difference Frequency Generation Absorption Spectrometers for Highly Sensitive Airborne Measurements of Trace Atmospheric Constituents”, Society of Photo-Optical Instrumentation Engineers, Oct. 2006.

29. Petter Weibring, Dirk Richter, James G. Walega, Alan Fried, “Airborne Difference Frequency Spectrometer for Ultra Sensitive Formaldehyde Measurements,” Conference on Lasers and Electro-Optics, Baltimore, MD (2007)

30. M. Trainer, E. Atlas, J. de Gouw, F. Flocke, A. Fried, J. Holloway, A. Neuman, J. Nowak, J. Peischl, D. Richter, T. Ryerson, J. Walega, C. Warnecke, P. Weibring, W. Zheng, “Rapid and Efficient Production of Ozone over Houston, October 6, 2006 - a Case Study,” NOAA workshop, Austin, TX (May 29-31, 2007)

31. Petter Weibring, Dirk Richter, James G. Walega, Alan Fried, “Demonstration of an Ultra Sensitive Airborne Difference Frequency Spectrometer: Performance Characterization and Ambient Measurements of Formaldehyde,” Field Laser Applications in Industry and Research, Florence, Italy (September 2-7, 2007)