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Duxbury, Geoffrey and Kelly, James F. and Blake, Thomas A. and Langford, Nigel (2012) Observation of infrared free-induction decay and optical nutation signals from nitrous oxide using a current modulated quantum cascade laser. Journal of Chemical Physics, 136 (17). 174317. ISSN 0021-9606

Duxbury, Geoffrey and Kelly, James F. and Blake, Thomas A. and Langford, Nigel (2012) Sub-Doppler spectra of infrared hyperfine transitions of nitric oxide using a pulse modulated quantum cascade laser : rapid passage, free induction decay, and the ac Stark effect. Journal of Chemical Physics, 136 (17). 174319. ISSN 0021-9606

Duxbury, Geoffrey and Kelly, James F. and Blake, Thomas A. and Langford, Nigel (2012) The ac Stark effect in nitric oxide induced by rapidly swept continuous wave quantum cascade lasers. Journal of Chemical Physics, 136 (17). 174318. ISSN 0021-9606

Duxbury, G. and Hay, K. G. and Langford, N. and Johnson, M. P. and Black, J. D. (2011) Real-time diagnostics of a jet engine exhaust using an intra-pulse quantum cascade laser spectrometer. Molecular Physics, 109 (17-18). pp. 2131-2142. ISSN 0026-8976

Tasinato, Nicola and Hay, Kenneth G. and Langford, Nigel and Duxbury, Geoffrey and Wilson, David (2010) Time dependent measurements of nitrous oxide and carbon dioxide collisional relaxation processes by a frequency down-chirped quantum cascade laser : rapid passage signals and the time dependence of collisional processes. Journal of Chemical Physics, 132 (16). 164301. ISSN 0021-9606

Tasinato, Nicola and Duxbury, Geoffrey and Langford, Nigel and Hay, Kenneth G. (2010) An investigation of collisional processes in a Dicke narrowed transition of water vapor in the 7.8 μm spectral region by frequency down-chirped quantum cascade laser spectroscopy. Journal of Chemical Physics, 132 (4). 044316. ISSN 0021-9606

Duxbury, Geoffrey and Tasinato, Nicola and Hay, Kenneth and Wilson, David and Langford, Nigel; Lewis, JKC and PredoiCross, A, eds. (2010) Collisional effects on quantum cascade laser induced molecular alignment. In: 20th International Conference on Spectral Line Shapes, 2010-06-06 - 2010-06-11.

Duxbury, Geoffrey and Langford, Nigel and Hay, Kenneth and Tasinato, Nicola (2009) Quantum cascade laser spectroscopy: diagnostics to non-linear optics. Journal of Modern Optics, 56 (18-19). pp. 2034-2048. ISSN 1362-3044

Ma, J. and Cheesman, A. and Ashfold, M.N.R. and Hay, K.G. and Wright, S. and Langford, N. and Duxbury, G. and Mankelevich, Y.A. (2009) Quantum cascade laser investigations of CH4 and C2H2 interconversion in hydrocarbon/H2 gas mixtures during microwave plasma enhanced chemical vapor deposition of diamond. Journal of Applied Physics, 106 (3). 033305. ISSN 0021-8979

Major, A. and Hutchings, D. and Langford, N. and Ferguson, A.I. and Aitchison, J.S. and Smith, P.W.E., Natural Sciences and Engineering Research Council (NSERC) in Canada (Funder) (2009) Two-photon absorption properties of crystalline knbo3 at 430 nm and efficient high pulse energy blue second-harmonic generation. Laser Physics Letters, 6 (6). pp. 450-453. ISSN 1612-2011

Hay, K.G. and Wright, S. and Duxbury, G. and Langford, N. (2008) In-flight measurements of ambient methane, nitrous oxide and water using a quantum cascade laser based spectrometer. Applied Physics B: Lasers and Optics, 90 (2). pp. 329-337. ISSN 0946-2171

Duxbury, G. and Langford, N. and Hay, K.G. (2008) Delayed rapid passage and transient gain signals generated using a chirped 8 mu m quantum cascade laser. Journal of Modern Optics, 55 (19-20). pp. 3293-3303. ISSN 1362-3044

Duxbury, Geoffrey and Langford, Nigel (2007) Quantum cascade laser spectroscopy, trace gas analysis to non-linear optics. In: 6th International Kharkov Symposium on physics and engineering of microwaves, millimeter and submillimeter waves/workshop on terahertz technologies, 2007-06-25 - 2007-06-30.

Duxbury, G. and Langford, N. and McCulloch, M. T. and Wright, S. (2007) Rapid passage induced population transfer and coherences in the 8 micron spectrum of nitrous oxide. Molecular Physics, 105 (5-7). pp. 741-754. ISSN 0026-8976

Zhang, Wei and Ackemann, Thorsten and Schmid, Marc and Langford, Nigel and Ferguson, Allister I. (2006) Femtosecond synchronously mode-locked vertical-external cavity surface-emitting laser. Optics Express, 14 (5). pp. 1810-1821. ISSN 1094-4087

Cheesman, A. and Smith, J.A. and Ashfold, M.N.R. and Langford, N. and Wright, S. and Duxbury, G. (2006) Application of a quantum cascade laser for time-resolved, in situ probing of CH4/H2 and C2H2/H2 gas mixtures during microwave plasma enhanced chemical vapor deposition of diamond. Journal of Physical Chemistry A, 110 (8). 2821 -2828. ISSN 1089-5639

McCulloch, M. T. and Duxbury, G. and Langford, N. (2006) Observation of saturation and rapid passage signals in the 10.25 micron spectrum of ethylene using a frequency chirped quantum cascade laser. Molecular Physics, 104 (16-17). pp. 2767-2779. ISSN 0026-8976

Langford, N. and Duxbury, G. and Wright, S. (2006) A compact quantum-cascade laser based spectrometer for monitoring the concentrations of methane and nitrous oxide in the troposphere. Applied Physics B: Lasers and Optics, 85 (2-3). pp. 243-249. ISSN 0946-2171

Duxbury, G and Langford, N and McCulloch, M T and Wright, S (2005) Quantum cascade semiconductor infrared and far-infrared lasers : from trace gas sensing to non-linear optics. Chemical Society Reviews, 34 (11). pp. 921-934. ISSN 0306-0012

McCulloch, M T and Langford, N and Duxbury, G (2005) Real-time trace-level detection of carbon dioxide and ethylene in car exhaust gases. Applied Optics, 44 (14). pp. 2887-2894. ISSN 1559-128X

Major, Arkady and Aitchison, J.S. and Smith, Peter W.E. and Langford, Nigel and Ferguson, Allister I. (2005) Efficient Raman shifting of high-energy picosecond pulses into the eye-safe 1.5-µm spectral region by use of a KGd(WO4)_2 crystal. Optics Letters, 30 (4). pp. 421-423. ISSN 0146-9592

Major, Arkady and Aitchison, J.S. and Smith, Peter W.E. and Langford, Nigel and Ferguson, Allister I. (2004) Coherent two-photon absorption spectroscopy of the Raman-active KGd(WO4)2 crystal. Optics Letters, 29 (24). pp. 2896-2898. ISSN 0146-9592

Major, A. and Nikolakakos, I. and Aitchison, J.S. and Ferguson, A.I. and Langford, N. and Smith, P.W.E. (2003) Characterization of the nonlinear refractive index of the laser crystal Yb:KGd(WO 4) 2. Applied Physics B: Lasers and Optics, 77 (4). pp. 433-436. ISSN 0946-2171

McCulloch, Michael T. and Normand, Erwan L. and Langford, Nigel and Duxbury, Geoffrey and Newnham, D.A. (2003) Highly sensitive detection of trace gases using the time-resolved frequency downchirp from pulsed quantum-cascade lasers. Journal of the Optical Society of America B, 20 (8). pp. 1761-1768. ISSN 1520-8540

Normand, E. and McCulloch, M. and Duxbury, G. and Langford, N. (2003) Fast, real-time spectrometer based on a pulsed quantum-cascade laser. Optics Letters, 28 (1). pp. 16-18. ISSN 0146-9592

Major, A. and Langford, N. and Graf, T. and Burns, D. and Ferguson, A.I. (2003) Diode-pumped passively mode-locked nd:KGd(WO4)2 laser with 1-W average output power. Optics Letters, 27 (16). pp. 1478-1480. ISSN 0146-9592

Major, A. and Langford, N. and Graf, T. and Ferguson, A.I. (2002) Additive-pulse mode locking of a diode-pumped Nd:KGd(WO4)2 laser. Applied Physics B: Lasers and Optics, 75 (4-5). pp. 467-469. ISSN 0946-2171

Major, A. and Langford, N. and Graf, T. and Burns, D. and Ferguson, A.I. (2002) Diode-pumped passively mode-locked Nd:KGd(WO_4 )_2 laser with 1-W average output power. Optics Letters, 27 (16). pp. 1478-1480. ISSN 0146-9592

Major, A. and Giniunas, L. and Langford, N. and Ferguson, A.I. and Burns, D. and Bente, E. and Danielius, R. (2002) Saturable bragg reflector-based continuous-wave mode locking of yb : kgd(wo4)(2) laser. Journal of Modern Optics, 49 (5-6). pp. 787-793. ISSN 1362-3044

Major, A. and Langford, N. and Ferguson, A.I. and Graf, T. and Burns, D.; (2002) Diode-pumped passively mode-locked nd:KGd(WO4)2 laser using saturable Bragg reflector. In: Lasers and electro-optics 2002 technical digest. IEEE, GBR. ISBN 1557527067

McConnell, G. and Langford, N. and Ferguson, A.I. (2001) Cavity-augmented frequency tripling of a continuous wave mode-locked laser. Journal of Physics D: Applied Physics, 34 (16). pp. 2408-2414. ISSN 1361-6463