In chronological order:
1. Y.Mine, N. Melander, D. Richter, D.G. Lancaster, K.P.
Petrov, R.F. Curl, F.K. Tittel, "Detection of formaldehyde
using mid-infrared difference frequency generation,"
Applied Physics B-Lasers and Optics, B65, 6, 771-774 (1997)
2. D.G. Lancaster, D. Richter, R.F. Curl, F.K.
Tittel, "Real-Time Measurements of Trace Gases Using a
Compact Difference Frequency Based Sensor Operating at 3.5
μm," Applied Physics B – Lasers and Optics,
Special Issue on Environmental Trace Gas Detection using
Laser Spectroscopy, B67, 3, 339-345 (1998)
3. D. Richter, D.G. Lancaster, R.F. Curl, W. Neu,
F.K. Tittel, "Compact mid-infrared trace gas sensor based
on difference-frequency generation of two diode lasers in
periodically poled LiNbO3," Applied Physics B –
Lasers and Optics, Special Issue on Environmental Trace Gas
Detection using Laser Spectroscopy, B67, 3, 347-350 (1998)
4. D.G. Lancaster, D. Richter, F.K. Tittel,
"Portable fiber coupled diode laser based sensor for
multiple trace gas detection," Applied Physics B - Lasers
and Optics, DOI 10.1007/s003409900115 (1999)
5. D. G. Lancaster, D. Richter, R. F. Curl, F.K.
Tittel, L. Goldberg, J. Koplow, "High power cw mid-IR
radiation by difference frequency mixing of diode laser
seeded fiber amplifiers and its application to dual beam
spectroscopy," Optics Letters, 24, 23, 1744-1746 (1999)
6. F. K. Tittel, D. G. Lancaster, D. Richter, "Novel
Diode Laser Based Sensors for Gas Sensing Applications,"
Laser Physics, 10, 1, 1-7 (2000)
7. D. G. Lancaster, R. Weidner, D. Richter, F.K.
Tittel, J. Limpert, "Compact CH4 sensor based on difference
frequency mixing of diode lasers in quasi-phasematched
LiNbO3," Optics Communication, 175, 461-468 (2000)
8. Dirk Richter, David G. Lancaster, Frank K.
Tittel, "Development of an automated diode laser based
multi-component gas sensor," Applied Optics 39, 4444-4450
(2000)
9. Limpert, J.; Zellmer, H.; Tunnermann, A.;
Lancaster, D.G.; Weidner, R.; Richter, D.; Tittel,
F.K.,"Tunable continuous-wave DFG based gas sensor using
fibre amplified 1.5 μm external cavity diode laser and
high power 1 mm diode laser," Electron. Lett. 36, 1739-1741
(2000)
10. Naoya Matsuoka, Shigeru Yamaguchi, Kenzo Nanri, Tomoo
Fujioka, Dirk Richter, and Frank K. Tittel, “Yb fiber
laser pumped mid-IR source based on difference frequency
generation and its application to ammonia detection,”
Japanese Journal of Applied Physics 40, 625-628 (2001)
11. R.Claps, F.V. Englich, D. Leleux, D. Richter, F.K.
Tittel, R.F. Curl, "Ammonia detection using near infrared
laser based overtone spectroscopy," Applied Optics 40,
4387-4394 (2001)
12. Dirk Richter, Miklos Erdelyi, Robert F. Curl, Frank K.
Tittel, Clive Oppenheimer, Hayley J. Duffell, Mike Burton,
“Field measurements of volcanic gases using tunable
diode laser based mid-infrared and fourier transform
infrared spectrometers,”Optics and Laser Engineering
37, 171-186 (2002)
13. M. Erdelyi, D. Richter and F. K. Tittel,
“Measurement of 13CO2 / 12CO2 isotopic ratio using a
difference-frequency-based sensor operating at 4.35
μm,” Applied Physics B-Lasers and Optics 75,
289-295 (2002)
14. D. Richter, A. Fried, B. P. Wert, J. G. Walega and F.
K. Tittel, “Development of a tunable mid-IR
difference-frequency laser source for highly sensitive
airborne trace gas detection,” Applied Physics B -
Lasers and Optics 75, 28-288 (2002)
15. D. Richter and P. Weibring, "Ultra-high precision
mid-IR spectrometer I: Design and analysis of an optical
fiber pumped difference-frequency generation source,"
Applied Physics B: Lasers and Optics 82, 479-486, March
2006 (DOI: 10.1007/s00340-005-2072-2
Published Online December 17, 2005)
16. P. Weibring, D. Richter, A. Fried, J.G. Walega and C.
Dyroff, "Ultra-high precision mid-IR spectrometer II:
System description and Spectroscopic Performance," Applied
Physics B: Lasers and Optics 85, 207-218, November 2006
(10.1007/s00340-006-2300-4 Published
Online June 24, 2006)
17. D. Richter, P. Weibring, A. Fried, O. Tadanaga, Y.
Nishida, M. Asobe, and H. Suzuki, " High-power, tunable difference frequency
generation source for absorption spectroscopy based on
a ridge waveguide periodically poled lithium niobate
crystal," Opt. Express 15, 564-571 (2007)
18. C. Dyroff, P. Weibring, A. Fried, D. Richter, J.G.
Walega, A. Zahn, W. Freunde, P. Werle,
“Stark-enhanced diode laser spectroscopy of
formaldehyde using a modified Herriott-type multipass
cell,” Applied Physics B - Lasers and Optics (June
2007) (DOI: 10.1007/s00340-007-2671-1)
19. P. Weibring, D. Richter, J. G. Walega, and A. Fried,
"First demonstration of a high performance
difference frequency spectrometer on airborne
platforms," Opt. Express 15, 13476-13495 (2007)
