Publications
2024
Resonant excitation of plasma waves in a plasma channel
Ross, A. J., Chappell, J., van de Wetering, J. J., Cowley, J., Archer, E., Bourgeois, N., . . . Hooker, S. M. (2024). Resonant excitation of plasma waves in a plasma channel. Physical Review Research, 6(2). doi:10.1103/physrevresearch.6.l022001
2023
Measurement of the decay of laser-driven linear plasma wakefields
Jonnerby, J., von Boetticher, A., Holloway, J., Corner, L., Picksley, A., Ross, A. J., . . . Hooker, S. M. (2023). Measurement of the decay of laser-driven linear plasma wakefields.. Physical review. E, 108(5-2), 055211. doi:10.1103/physreve.108.055211
Demonstration of tunability of HOFI waveguides via start-to-end simulations
Mewes, S. M., Boyle, G. J., Pousa, A. F., Shalloo, R. J., Osterhoff, J., Arran, C., . . . Thevenet, M. (2023). Demonstration of tunability of HOFI waveguides via start-to-end simulations. PHYSICAL REVIEW RESEARCH, 5(3). doi:10.1103/PhysRevResearch.5.033112
2022
2021
Meter-scale conditioned hydrodynamic optical-field-ionized plasma channels
Hooker, S. M., Alejo, A., Arran, C., von Boetticher, A., Bourgeois, N., Corner, L., . . . Walczak, R. (2021). Meter-scale conditioned hydrodynamic optical-field-ionized plasma channels. In S. S. Bulanov, C. B. Schroeder, & J. Schreiber (Eds.), Laser Acceleration of Electrons, Protons, and Ions VI (pp. 1). SPIE. doi:10.1117/12.2592325
CAS Proceedings of the 2019 course on High Gradient Wakefield Accelerators, Sesimbra, Portugal, 11–22 March 2019
Corner, L. (2021). CAS Proceedings of the 2019 course on High Gradient Wakefield Accelerators, Sesimbra, Portugal, 11–22 March 2019 (CERN-ACC-2020-0014). Retrieved from http://cds.cern.ch/record/2729705/files/CERN-ACC-2020-0014.pdf
2020
Investigations of Optical Guiding through Hydrodynamic Optical-Field Ionised Plasma Channels
Corner, L. (2020). Investigations of Optical Guiding through Hydrodynamic Optical-Field Ionised Plasma Channels: Investigations of Optical Guiding through Hydrodynamic Optical-FieldIonised Plasma Channels. Central Laser Facility, Science and Technology Facilities Council. Retrieved from https://www.clf.stfc.ac.uk/Gallery/CLF%20Annual%20report%202018-19.pdf
Measurement of the decay rate of laser-driven linear wakefields
Corner, L. (2020). Measurement of the decay rate of laser-driven linear wakefields: Measurement of the decay rate of laser-driven linear wakefields. Central Laser Facility, Science and Technology Facilities Council. Retrieved from https://www.clf.stfc.ac.uk/Gallery/CLF%20Annual%20report%202018-19.pdf
Meter-Scale, Conditioned Hydrodynamic Optical-Field-Ionized Plasma Channels
Picksley, A., Alejo, A., Shalloo, R. J., Arran, C., Boetticher, A. V., Corner, L., . . . Hooker, S. M. (2020). Meter-Scale, Conditioned Hydrodynamic Optical-Field-Ionized Plasma Channels. Physical Review E: Statistical, Nonlinear, and Soft Matter Physics. doi:10.1103/PhysRevE.102.053201
Introduction to Laser Physics
Corner, L. (2020). Introduction to Laser Physics. Retrieved from http://arxiv.org/abs/2008.03940v1
Guiding of high-intensity laser pulses in 100mm-long hydrodynamic optical-field-ionized plasma channels
Picksley, A., Alejo, A., Cowley, J., Bourgeois, N., Corner, L., Feder, L., . . . Hooker, S. M. (2020). Guiding of high-intensity laser pulses in 100-mm-long hydrodynamic optical-field-ionized plasma channels. PHYSICAL REVIEW ACCELERATORS AND BEAMS, 23(8). doi:10.1103/PhysRevAccelBeams.23.081303
2019
laser guiding in plasma channels for high-rep-rate, low-plasma-density LWFAs (Conference Presentation)
Hooker, S. M., Arran, C., von Boetticher, A., Corner, L., Hine, G., Holloway, J., . . . Walczak, R. (2019). laser guiding in plasma channels for high-rep-rate, low-plasma-density LWFAs (Conference Presentation). In E. Esarey, C. B. Schroeder, & J. Schreiber (Eds.), Laser Acceleration of Electrons, Protons, and Ions V (pp. 18). SPIE. doi:10.1117/12.2522065
Low-Density Hydrodynamic Optical-Field-Ionized Plasma Channels Generated With An Axicon Lens
Shalloo, R. J., Arran, C., Picksley, A., von Boetticher, A., Corner, L., Holloway, J., . . . Hooker, S. M. (2019). Low-density hydrodynamic optical-field-ionized plasma channels generated with an axicon lens. PHYSICAL REVIEW ACCELERATORS AND BEAMS, 22(4). doi:10.1103/PhysRevAccelBeams.22.041302
Towards an Advanced Linear International Collider
collaboration, A. L. E. G. R. O. (2019). Towards an Advanced Linear International Collider. Retrieved from http://arxiv.org/abs/1901.10370v2
ALEGRO input for the 2020 update of the European Strategy
Cros, B., & Muggli, P. (2019). ALEGRO input for the 2020 update of the European Strategy. Retrieved from http://arxiv.org/abs/1901.08436v2
2018
Hydrodynamic optical-field-ionized plasma channels
Shalloo, R. J., Arran, C., Corner, L., Holloway, J., Jonnerby, J., Walczak, R., . . . Hooker, S. M. (2018). Hydrodynamic optical-field-ionized plasma channels. PHYSICAL REVIEW E, 97(5). doi:10.1103/PhysRevE.97.053203
2017
Excitation and control of plasma wakefields by multiple laser pulses
Cowley, J., Thornton, C., Arran, C., Shalloo, R. J., Corner, L., Cheung, G., . . . Hooker, S. M. (2017). Excitation and control of plasma wakefields by multiple laser pulses. Physical Review Letters, 119(4). doi:10.1103/PhysRevLett.119.044802
The Coherent Combination of Fibre Lasers - Towards Realistic Applications
Tudor, P., Corner, L., & Walczak, R. (2017). The Coherent Combination of Fibre Lasers - Towards Realistic Applications. In ADVANCED ACCELERATOR CONCEPTS Vol. 1812. doi:10.1063/1.4975915
2016
Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration
Shalloo, R. J., Corner, L., Arran, C., Cowley, J., Cheung, G., Thornton, C., . . . Hooker, S. M. (2016). Generation of laser pulse trains for tests of multi-pulse laser wakefield acceleration. In NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 829 (pp. 383-385). doi:10.1016/j.nima.2016.02.044
Secondary wavelength stabilization of unbalanced Michelson interferometers for the generation of low-jitter pulse trains
Shalloo, R. J., & Corner, L. (2016). Secondary wavelength stabilization of unbalanced Michelson interferometers for the generation of low-jitter pulse trains. OPTICS LETTERS, 41(17), 4068-4070. doi:10.1364/OL.41.004068
2014
Multi-pulse laser wakefield acceleration: a new route to efficient, high-repetition-rate plasma accelerators and high flux radiation sources
Hooker, S. M., Bartolini, R., Mangles, S. P. D., Tunnermann, A., Corner, L., Limpert, J., . . . Walczak, R. (2014). Multi-pulse laser wakefield acceleration: a new route to efficient, high-repetition-rate plasma accelerators and high flux radiation sources. Journal of Physics B: Atomic, Molecular and Optical Physics, 47. doi:10.1088/0953-4075/47/23/234003
Laserwire at the Accelerator Test Facility 2 with submicrometer resolution
Nevay, L. J., Boogert, S. T., Karataev, P., Kruchinin, K., Corner, L., Howell, D. F., . . . Terunuma, N. (2014). Laserwire at the Accelerator Test Facility 2 with submicrometer resolution. Physical Review Special Topics: Accelerators and Beams, 17(7). doi:10.1103/PhysRevSTAB.17.072802
Status of the CLIC-UK R&D programme on design of key systems for the compact linear collider
Clarke, J. A., Collomb, N., Jamison, S. P., McIntosh, P. A., Shepherd, B. J. A., Stokes, G., . . . Praveen Kumar, A. V. (2014). Status of the CLIC-UK R&D programme on design of key systems for the compact linear collider. In IPAC 2014: Proceedings of the 5th International Particle Accelerator Conference (pp. 1354-1357).
High power fiber laser system for a high repetition rate laserwire
Nevay, L. J., Walczak, R., & Corner, L. (2014). High power fiber laser system for a high repetition rate laserwire. PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS, 17(7). doi:10.1103/PhysRevSTAB.17.072801
Fibre lasers for gamma colliders
Corner, L. (2014). Fibre lasers for gamma colliders. EUROPEAN PHYSICAL JOURNAL-SPECIAL TOPICS, 223(6), 1207-1211. doi:10.1140/epjst/e2014-02174-2
Laserwire at the Accelerator Test Facility 2 with Sub-Micrometre Resolution
Laserwire: A high resolution non-invasive beam profiling diagnostic
Corner, L., Aryshev, A., Blair, G. A., Boogert, S. T., Karataev, P., Kruchinin, K., . . . Walczak, R. (2014). Laserwire: A high resolution non-invasive beam profiling diagnostic. In NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 740 (pp. 226-228). doi:10.1016/j.nima.2013.10.043
Multi-Pulse Laser Wakefield Acceleration: A New Route to Efficient, High-Repetition-Rate Plasma Accelerators and High Flux Radiation Sources
Experimental validation of a novel compact focusing scheme for future energy-frontier linear lepton colliders.
White, G. R., Ainsworth, R., Akagi, T., Alabau-Gonzalvo, J., Angal-Kalinin, D., Araki, S., . . . Blanco, O. (2014). Experimental validation of a novel compact focusing scheme for future energy-frontier linear lepton colliders.. Physical Review Letters, 112(3). doi:10.1103/PhysRevLett.112.034802
2013
Sub-micrometre resolution laser wire transverse beam size measurement system
Nevay, L. J., Blair, G. A., Boogert, S. T., Karataev, P., Krunchinin, K., Corner, L., . . . Terunuma, N. (2013). Sub-micrometre resolution laser wire transverse beam size measurement system. In IPAC 2013: Proceedings of the 4th International Particle Accelerator Conference (pp. 795-797).
Sub-micrometre resolution laserwire transverse beam size measurement system
Nevay, L. J., Boogert, S. T., Karataev, P., Kruchinin, K., Corner, L., Walczak, R., . . . Terunuma, N. (2013). Sub-micrometre resolution laserwire transverse beam size measurement system. In IBIC 2013: Proceedings of the 2nd International Beam Instrumentation Conference (pp. 243-246).
2012
Multiple Pulse Resonantly Enhanced Laser Plasma Wakefield Acceleration
Corner, L., Walczak, R., Nevay, L. J., Dann, S., Hooker, S. M., Bourgeois, N., & Cowley, J. (2012). Multiple Pulse Resonantly Enhanced Laser Plasma Wakefield Acceleration. In ADVANCED ACCELERATOR CONCEPTS Vol. 1507 (pp. 872-+). doi:10.1063/1.4773813
2011
Micron-scale laser-wire at the ATF-II at KEK commissioning and results
Nevay, L. J., Corner, L., Walczak, R., Blair, G., Boogert, S., Deacon, L., . . . Urakawa, J. (2011). Micron-scale laser-wire at the ATF-II at KEK commissioning and results. In IPAC 2011 - 2nd International Particle Accelerator Conference (pp. 1401-1403).
Photonic crystal fibre laser for electron beam emittance measurement
Corner, L., Nevay, L. J., & Walczak, R. (2011). Photonic crystal fibre laser for electron beam emittance measurement. In IPAC 2011 - 2nd International Particle Accelerator Conference (pp. 577-579).
2010
Micron-scale laser-wire scanner for the KEK Accelerator Test Facility extraction line
Boogert, S. T., Blair, G. A., Boorman, G., Bosco, A., Deacon, L. C., Karataev, P., . . . Ganaway, F. (2010). Micron-scale laser-wire scanner for the KEK Accelerator Test Facility extraction line. PHYSICAL REVIEW SPECIAL TOPICS-ACCELERATORS AND BEAMS, 13(12). doi:10.1103/PhysRevSTAB.13.122801
A high power fibre laser for electron beam emittance measurements
Corner, L., Nevay, L. J., & Walczak, R. (2010). A high power fibre laser for electron beam emittance measurements. In IPAC 2010 - 1st International Particle Accelerator Conference (pp. 3227-3229).
Micron size laser-wire system at the ATF extraction line, recent results and ATF-II upgrade
Aryshev, A., Blair, G. A., Boogert, S. T., Boorman, G., Bosco, A., Corner, L., . . . Walczak, R. (2010). Micron size laser-wire system at the ATF extraction line, recent results and ATF-II upgrade. In NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT Vol. 623 (pp. 564-566). doi:10.1016/j.nima.2010.03.071
2008
Ultrafast amplified fiber laser for laser-wire measurements in particle accelerators
Zaouter, Y., Mottay, E., Corner, L., & Delerue, N. (2008). Ultrafast amplified fiber laser for laser-wire measurements in particle accelerators. In COMMERCIAL AND BIOMEDICAL APPLICATIONS OF ULTRAFAST LASERS VIII Vol. 6881. doi:10.1117/12.762951
Development of a high power fibre laser for laser based electron beam diagnostics
Corner, L., Nevay, L. J., Delerue, N., Howell, D. F., Newman, M., Walczak, R., . . . Boogert, S. T. (2008). Development of a high power fibre laser for laser based electron beam diagnostics. In EPAC 2008 - Contributions to the Proceedings (pp. 1359-1361).
Micron size laser-wire system at the ATF extraction line
Aryshev, A., Blair, G. A., Boogert, S. T., Boorman, G., Bosco, A., Deacon, L., . . . Urakawa, J. (2008). Micron size laser-wire system at the ATF extraction line. In EPAC 2008 - Contributions to the Proceedings (pp. 1065-1067).
2007
ATF extraction line laser-wire system
Deacon, L., Boogert, S. T., Blair, G. A., Boorman, G., Bosco, A., Karataev, P., . . . Urakawa, J. (2007). ATF extraction line laser-wire system. In 2007 IEEE Particle Accelerator Conference (PAC) (pp. 2636-2638). IEEE. doi:10.1109/pac.2007.4440363
ATF extraction line laser-wire system
Deacon, L., Boogert, S. T., Blair, G. A., Boorman, G., Bosco, A., Karataev, P., . . . Urakawa, J. (2007). ATF extraction line laser-wire system. In 2007 IEEE PARTICLE ACCELERATOR CONFERENCE, VOLS 1-11 (pp. 1394-+). Retrieved from https://www.webofscience.com/
2005
Spectral phase interferometry for complete reconstruction of attosecond pulses
Cormier, E., Corner, L., Kosik, E. M., Walmsley, I. A., & Wyatt, A. S. (2005). Spectral phase interferometry for complete reconstruction of attosecond pulses. LASER PHYSICS, 15(6), 909-915. Retrieved from https://www.webofscience.com/
Self-referencing, spectrally, or spatially encoded spectral interferometry for the complete characterization of attosecond electromagnetic pulses
Cormier, E., Walmsley, I. A., Kosik, E. M., Wyatt, A. S., Corner, L., & DiMauro, L. F. (2005). Self-referencing, spectrally, or spatially encoded spectral interferometry for the complete characterization of attosecond electromagnetic pulses. PHYSICAL REVIEW LETTERS, 94(3). doi:10.1103/PhysRevLett.94.033905
Complete characterization of attosecond pulses
Kosik, E. M., Corner, L., Wyatt, A. S., Cormier, E., Walmsley, I. A., & Dimauro, L. F. (2005). Complete characterization of attosecond pulses. In JOURNAL OF MODERN OPTICS Vol. 52 (pp. 361-378). doi:10.1080/09500340412331307951
Detector concepts
Aarons, G., Abe, T., Abernathy, J., Ablikim, M., Abramowicz, H., Adey, D., . . . Bechtle, P. (2005). Detector concepts. In LCWS 2005 - 2005 International Linear Collider Workshop.
MEASURING ATTOSECOND XUV PULSES
Walmsley, I., Corner, L., Wyatt, A., & Cormier, E. (2005). MEASURING ATTOSECOND XUV PULSES. In Frontiers in Optics Vol. 94 (pp. JMC1). OSA. doi:10.1364/fio.2005.jmc1
2004
Spatially encoded spectral interferometry for complete characterisation of attosecond XUV pulses
Cormier, E., Walmsley, I. A., Kosik, E. M., Corner, L., & DiMauro, L. F. (2005). Spatially encoded spectral interferometry for complete characterisation of attosecond XUV pulses. ULTRAFAST PHENOMENA XIV, 79, 124-126. Retrieved from https://www.webofscience.com/
Difference frequency generation in periodically poled lithium niobate and its use in the detection of atmospheric methane
Clark, H. Y., Corner, L., Denzer, W., Hancock, G., Hutchinson, A., Islam, M., . . . Ritchie, G. A. D. (2004). Difference frequency generation in periodically poled lithium niobate and its use in the detection of atmospheric methane. CHEMICAL PHYSICS LETTERS, 399(1-3), 102-108. doi:10.1016/j.cplett.2004.09.146
Self-referencing spectral interferometry for the characterization of attosecond electromagnetic pulses
Cormier, E., Walmsley, I. A., Kosik, E. M., Corner, L., & DiMauro, L. F. (2004). Self-referencing spectral interferometry for the characterization of attosecond electromagnetic pulses. OSA Trends in Optics and Photonics Series, 96 A, 1419-1420.
Spatially encoded spectral interferometry for complete characterisation of attosecond XUV pulses
Cormier, E., Walmsley, I. A., Kosik, E. M., Corner, L., & DiMauro, L. F. (2004). Spatially encoded spectral interferometry for complete characterisation of attosecond XUV pulses. In Optics InfoBase Conference Papers.
2003
Application of the three-valence model of photorefraction to rhodium-doped barium titanate
Corner, L., Kaczmarek, M., & Damzen, M. J. (2003). Application of the three-valence model of photorefraction to rhodium-doped barium titanate. JOURNAL OF MODERN OPTICS, 50(14), 2173-2183. doi:10.1080/0950034031000095803
Measurements of pressure broadening coefficients of selected transitions in the 2ν<sub>5</sub> band of formaldehyde
Barry, H. R., Corner, L., Hancock, G., Peverall, R., Ranson, T. L., & Ritchie, G. A. D. (2003). Measurements of pressure broadening coefficients of selected transitions in the 2ν<sub>5</sub> band of formaldehyde. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 5(15), 3106-3112. doi:10.1039/b304139p
Comparison of cross-section measurements of the 2ν<sub>5</sub> overtone band of formaldehyde determined by cavity ringdown and cavity enhanced spectroscopy
Corner, L., Barry, H. R., & Hancock, G. (2003). Comparison of cross-section measurements of the 2ν<sub>5</sub> overtone band of formaldehyde determined by cavity ringdown and cavity enhanced spectroscopy. CHEMICAL PHYSICS LETTERS, 374(1-2), 28-32. doi:10.1016/S0009-2614(03)00679-1
Application of the three-valence model of photorefraction to rhodium-doped barium titanate
Corner, L., Kaczmarek, M., & Damzen, M. J. (2003). Application of the three-valence model of photorefraction to rhodium-doped barium titanate. Journal of Modern Optics, 50(14), 2173-2183. doi:10.1080/09500340308234569
2002
Cavity-enhanced absorption spectroscopy with a rapidly swept diode laser
Bakowski, B., Corner, L., Hancock, G., Kotchie, R., Peverall, R., & Ritchie, G. A. D. (2002). Cavity-enhanced absorption spectroscopy with a rapidly swept diode laser. APPLIED PHYSICS B-LASERS AND OPTICS, 75(6-7), 745-750. doi:10.1007/s00340-002-1026-1
Erratum: Cross sections in the 2ν<inf>5</inf> band of formaldehyde studied by cavity enhanced absorption spectroscopy near 1.76 μm (Physical Chemistry Chemical Physics (2000) 4 (445))
Barry, H., Corner, L., Hancock, G., Peverall, R., & Ritche, G. A. D. (2002). Erratum: Cross sections in the 2ν<inf>5</inf> band of formaldehyde studied by cavity enhanced absorption spectroscopy near 1.76 μm (Physical Chemistry Chemical Physics (2000) 4 (445)). Physical Chemistry Chemical Physics, 4(8), 1500.
Sum frequency generation at 309 nm using a violet and a near-IR DFB diode laser for detection of OH
Corner, L., Gibb, J. S., Hancock, G., Hutchinson, A., Kasyutich, V. L., Peverall, R., & Ritchie, G. A. D. (2002). Sum frequency generation at 309 nm using a violet and a near-IR DFB diode laser for detection of OH. APPLIED PHYSICS B-LASERS AND OPTICS, 74(4-5), 441-444. doi:10.1007/s003400200810
Cross sections in the 2ν<sub>5</sub> band of formaldehyde studied by cavity enhanced absorption spectroscopy near 1.76 μ
Barry, H., Corner, L., Hancock, G., Peverall, R., & Ritchie, G. A. D. (2002). Cross sections in the 2ν<sub>5</sub> band of formaldehyde studied by cavity enhanced absorption spectroscopy near 1.76 μ. PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 4(3), 445-450. doi:10.1039/b109300m
2001
Cavity-enhanced absorption spectroscopy of methane at 1.73 μm
Barry, H. R., Corner, L., Hancock, G., Peverall, R., & Ritchie, G. A. D. (2001). Cavity-enhanced absorption spectroscopy of methane at 1.73 μm. CHEMICAL PHYSICS LETTERS, 333(3-4), 285-289. doi:10.1016/S0009-2614(00)01388-9
2000
OH detection by absorption of frequency-doubled diode laser radiation at 308 nm
Barry, H. R., Bakowski, B., Corner, L., Freegarde, T., Hawkins, O. T. W., Hancock, G., . . . Ritchie, G. A. D. (2000). OH detection by absorption of frequency-doubled diode laser radiation at 308 nm. CHEMICAL PHYSICS LETTERS, 319(1-2), 125-130. doi:10.1016/S0009-2614(00)00105-6
1999
A method for single-pass distortion correction using holography in rhodium-doped barium titanate
Corner, L., & Damzen, M. J. (1999). A method for single-pass distortion correction using holography in rhodium-doped barium titanate. APPLIED PHYSICS B-LASERS AND OPTICS, 68(5), 1039-1042. doi:10.1007/s003400050743
An analysis of the three-valence model of photorefraction
Corner, L., & Damzen, M. J. (1999). An analysis of the three-valence model of photorefraction. APPLIED PHYSICS B-LASERS AND OPTICS, 68(5), 819-826. doi:10.1007/s003400050710
1998
Analysis of the Three Valence Model of Photorefraction in Rhodium-Doped Barium Titanate
Corner, L., & Damzen, M. J. (n.d.). Analysis of the Three Valence Model of Photorefraction in Rhodium-Doped Barium Titanate. In CLEO/Europe Conference on Lasers and Electro-Optics (pp. 298). IEEE. doi:10.1109/cleoe.1998.719440
1997
Experimental and theoretical characterisation of rhodium-doped barium titanate
Corner, L., RamosGarcia, R., Petris, A., & Damzen, M. J. (1997). Experimental and theoretical characterisation of rhodium-doped barium titanate. OPTICS COMMUNICATIONS, 143(1-3), 165-172. doi:10.1016/S0030-4018(97)00295-2
Experimental investigation of high resolution imaging using Brillouin-enhanced four-wave mixing
Mocofanescu, A., Corner, L., RamosGarcia, R., & Damzen, M. J. (1997). Experimental investigation of high resolution imaging using Brillouin-enhanced four-wave mixing. JOURNAL OF MODERN OPTICS, 44(4), 731-737. doi:10.1080/09500349708230691