Search Results - "Ritchie, G A D"

Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode by Denzer, W, Hamilton, M L, Hancock, G, Islam, M, Langley, C E, Peverall, R, Ritchie, G A D

“…A fibre coupled near-infrared superluminescent light emitting diode that emits approximately 10 mW of radiation between 1.62 and 1.7 microm is employed in…”
Get more information

Multi-mode absorption spectroscopy using a quantum cascade laser for simultaneous detection of NO and H2O by O’Hagan, S., Pinto, T., Ewart, P., Ritchie, G. A. D.

“…Detection of multiple transitions in NO and H 2 O using multi-mode absorption spectroscopy, MUMAS, with a quantum cascade laser, QCL, operating at 5.3 μm at…”
Get full text

Trace species detection in the near infrared using Fourier transform broadband cavity enhanced absorption spectroscopy: initial studies on potential breath analytes by Denzer, W, Hancock, G, Islam, M, Langley, C E, Peverall, R, Ritchie, G A D, Taylor, D

“…Cavity enhanced absorption measurements have been made of several species that absorb light between 1.5 and 1.7 µm using both a supercontinuum source and…”
Get more information

Multi-mode absorption spectroscopy, MUMAS, using wavelength modulation and cavity enhancement techniques by Hamilton, M. L., Ritchie, G. A. D., Arita, Y., Ewart, P.

“…Multi-mode absorption spectroscopy, MUMAS, has been combined with the techniques of wavelength modulation spectroscopy, WMS, and cavity enhanced absorption…”
Get full text

Methyl Iodide Photodissociation at 193 nm: The I(2P1/2) Quantum Yield by Gilchrist, A, Hancock, G, Peverall, R, Richmond, G, Ritchie, G. A. D, Taylor, S

“…Methyl iodide photolysis at 193 nm has been studied through probing the I(2P1/2−2P3/2) transition in the atomic iodine photofragment using diode laser…”
Get full text

Diode laser based studies of the UV photolysis of molecular iodine by Hancock, G, Richmond, G, Ritchie, G A D, Taylor, S

“…The photolysis of molecular iodine at 193 and 248 nm has been studied by diode laser based frequency-modulated (FM) absorption spectroscopy with detection of…”
Get more information

Time-Resolved Detection of the CF3 Photofragment Using Chirped QCL Radiation by Hancock, G, Horrocks, S. J, Ritchie, G. A. D, Helden, J. H. van, Walker, R. J

“…This paper demonstrates how a quantum cascade laser (QCL) in its intrapulse mode can provide a simple method for probing the products of a photolysis event…”
Get full text

266 nm photolysis of CF3I and C2F5I studied by diode laser gain FM spectroscopy by Hancock, G, Hutchinson, A, Peverall, R, Richmond, G, Ritchie, G A D, Taylor, S

“…Frequency modulated diode laser based absorption at 1.315 microm has been used to measure the Doppler lineshapes of the I((2)P(1/2)-(2)P(3/2)) transition in…”
Get more information

Optical feedback cavity-enhanced absorption spectroscopy with a 3.24  μ m interband cascade laser by Manfred, K. M., Ritchie, G. A. D., Lang, N., Röpcke, J., van Helden, J. H.

“…The development of interband cascade lasers (ICLs) has made the strong C-H transitions in the 3 μm spectral region increasingly accessible. We present the…”
Get full text

Mid-infrared generation and spectroscopy with a PPLN ridge waveguide by DENZER, W, HANCOCK, G, HUTCHINSON, A, MUNDAY, M, PEVERALL, R, RITCHIE, G. A. D

“…We have utilised a periodically poled LiNbO3 crystal with a waveguide structure to produce up to 146 Delta *mW of mid-IR radiation around 2976 cm-1 by…”
Get full text

M-line spectroscopy on mid-infrared Si photonic crystals for fluid sensing and chemical imaging by Lavchiev, V M, Jakoby, B, Hedenig, U, Grille, Th, Kirkbride, J M R, Ritchie, G A D

“…The presented work demonstrates the design and characterization of Si-based photonic crystal waveguides operating as an evanescent wave absorption sensor in…”
Get full text

Laser spectroscopy on volatile sulfur compounds: possibilities for breath analysis by Ciaffoni, L, Peverall, R, Ritchie, G A D

“…There is an emerging interest in the detection of volatile sulfur compounds (VSCs) in the breath environment, given their biological relevance as potential…”
Get more information

A DFG-based cavity ring-down spectrometer for trace gas sensing in the mid-infrared by Whittaker, K. E., Ciaffoni, L., Hancock, G., Peverall, R., Ritchie, G. A. D.

“…Continuing studies into an all-diode laser-based 3.3 μm difference frequency generation cavity ring-down spectroscopy system are presented. Light from a…”
Get full text

Characterization of an external cavity diode laser based ring cavity NICE-OHMS system by Bell, C L, Hancock, G, Peverall, R, Ritchie, G A D, van Helden, J H, van Leeuwen, N J

“…The performance of an external cavity diode laser based noise immune cavity enhanced optical heterodyne molecular spectrometer is presented. To reduce the…”
Get full text

3.5-μm high-resolution gas sensing employing a LiNbO3 QPM-DFG waveguide module by Ciaffoni, L., Grilli, R., Hancock, G., Orr-Ewing, A. J., Peverall, R., Ritchie, G. A. D.

“…Diode laser technology coupled with a wavelength-conversion unit to produce mid-infrared narrow bandwidth laser light applicable to trace-gas detection and…”
Get full text

Chirped quantum cascade laser induced rapid passage signatures in an optically thick gas by Northern, J. H., Ritchie, G. A. D., Smakman, E. P., van Helden, J. H., Walker, R. J., Duxbury, G.

“…We report observations of rapid passage signals induced in samples of N 2 O and CH 4 present in a multipass cell with an optical path length of 5 m. The effect…”
Get full text

Line strength and collisional broadening studies of hydrogen sulphide in the 1.58 μm region using diode laser spectroscopy by Ciaffoni, L., Cummings, B. L., Denzer, W., Peverall, R., Procter, S. R., Ritchie, G. A. D.

“…High resolution diode laser spectroscopy has been applied to the detection of hydrogen sulphide at ppm levels utilizing different transitions within the region…”
Get full text

Wavelength modulation and cavity enhanced absorption spectroscopy using ∼1.9 μm radiation produced by difference frequency generation with a MgO doped PPLN crystal by Hamilton, M. L., Peverall, R., Ritchie, G. A. D., Thornton, L. J., van Helden, J. H.

“…We have demonstrated the production of ∼1.9 μm near-infrared radiation by using difference frequency generation within a 5% MgO doped PPLN crystal by coupling…”
Get full text

Cavity-enhanced absorption spectroscopy with a rapidly swept diode laser by BAKOWSKI, B, CORNER, L, HANCOCK, G, KOTCHIE, R, PEVERALL, R, RITCHIE, G. A. D

“…Cavity-enhanced absorption spectroscopy is explained in terms of the transmission function of a rapidly swept interferometer, and the integrated transmission…”
Get full text

Number density and temperature measurements obtained using sensitive diode laser spectroscopy in an argon plasma by BAKOWSKI, B, HANCOCK, G, PEVERALL, R, RITCHIE, G. A. D

“…The absolute concentration and translational temperature of the 2p10 and 2p7 excited states of argon have been measured in an inductively coupled plasma…”
Get full text