Dr. Gérald Roosen Profile

Dr. Gérald Roosen

Director at Institut d'Optique Graduate School

SPIE Involvement:

Author

Publications (31)

Proceedings Article | 3 April 2018 Open Access

State-of-the-art of photorefractive holographic interferometry and potentialities for space applications

Marc Georges, Philippe Lemaire, Gilles Pauliat, Jean-Claude Launay, Gérald Roosen

Proceedings Volume 10570, 105701G (2018) https://doi.org/10.1117/12.2326516

KEYWORDS: Crystals, Holographic interferometry, Holography, Cameras, Holograms, Laser crystals, Beam splitters, Diffraction, Visualization, Ferroelectric materials

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Proceedings Article | 18 July 2007 Paper

Homodyne detection for Lippmann data storage

Gilles Pauliat, Guillaume Maire, Carole Arnaud, Frédéric Guattari, Kevin Contreras, Gérald Roosen, Safi Jradi, Christiane Carré

Proceedings Volume 6620, 66200F (2007) https://doi.org/10.1117/12.738655

KEYWORDS: Homodyne detection, Signal detection, Data storage, Mirrors, Photography, Holography, Fiber Bragg gratings, Image processing, Diffraction, Reflectivity

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Proceedings Article | 20 April 2006 Paper

3D photonic crystals based on expitaxial III-V semiconductor structures for nonlinear optical interactions

Harold Chong, Richard De La Rue, Liam O'Faolain, Thomas Krauss, Nadia Belabas, Ariel Levenson, Fabrice Raineri, Rama Raj, Isabelle Sagnes, Dominique Coquillat, Magali Astic, Philippe Delaye, Philippe Lalanne, Robert Frey, Gérald Roosen

Proceedings Volume 6182, 618211 (2006) https://doi.org/10.1117/12.669476

KEYWORDS: Photonic crystals, Reflectivity, Mirrors, 3D metrology, Nonlinear optics, Thermal oxidation, Gallium arsenide, Aluminum, Group III-V semiconductors, Lanthanum

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Proceedings Article | 6 March 2006 Paper

Sub-millisecond in situ measurement of the photorefractive response in a self adaptive wavefront holography setup developed for acousto-optic imaging

M. Lesaffre, F. Jean, A. Bordes, F. Ramaz, E. Bossy, A. Boccara, M. Gross, P. Delaye, G. Roosen

Proceedings Volume 6086, 608612 (2006) https://doi.org/10.1117/12.641669

KEYWORDS: Crystals, Acousto-optics, Speckle, Laser crystals, Tissues, Ultrasonics, Modulation, Holography, Photons, Amplitude modulation

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Proceedings Article | 25 April 2005 Paper

Photorefractive acousto-optical imaging for thick biological tissues

Francois Ramaz, Benoit Forget, Michael Atlan, A. Claude Boccara, Michel Gross, Philippe Delaye, Gerald Roosen

Proceedings Volume 5697, (2005) https://doi.org/10.1117/12.590090

KEYWORDS: Crystals, Acousto-optics, Modulation, Phase modulation, Signal to noise ratio, Amplitude modulation, Sensors, Speckle, Photons, Acoustics

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Proceedings Article | 23 December 2004 Paper

Diffraction-limited polarized emission from a multimode Yb-doped fiber amplifier after nonlinear beam cleanup

Laurent Lombard, Arnaud Brignon, Jean-Pierre Huignard, Eric Lallier, Gaelle Lucas-Leclin, Patrick Georges, Gilles Pauliat, Gerald Roosen

Proceedings Volume 5620, (2004) https://doi.org/10.1117/12.580582

KEYWORDS: Crystals, Laser crystals, Phase conjugation, Mirrors, Multimode fibers, Fiber amplifiers, Two wave mixing, Diffraction, Nonlinear crystals, Optical amplifiers

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Proceedings Article | 1 September 2004 Paper

Lateral mode selection in self-organizing extended-cavity broad-area laser

Vincent Reboud, Nicolas Dubreuil, Gilles Pauliat, Gerald Roosen

Proceedings Volume 5452, (2004) https://doi.org/10.1117/12.545685

KEYWORDS: Semiconductor lasers, Crystals, Diodes, Holograms, Mirrors, Reflectivity, Optical filters, Modulation, High power lasers, Laser crystals

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Proceedings Article | 22 June 2004 Paper

Advances in pulsed holographic interferometry with photorefractive crystals

Marc Georges, Gilles Pauliat, I. Alexeenko, Giancarlo Pedrini, Philippe Lemaire, Gerald Roosen

Proceedings Volume 5503, (2004) https://doi.org/10.1117/12.579533

KEYWORDS: Crystals, Laser crystals, Diffraction, Holography, Polarization, Cameras, Anisotropy, Holograms, Holographic interferometry, Pulsed laser operation

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Proceedings Article | 7 June 2004 Paper

Diffraction-limited polarized emission from a multimode Yb-doped fiber amplifier after nonlinear beam cleanup

Laurent Lombard, Arnaud Brignon, Jean Pierre Huignard, Eric Lallier, Gaelle Lucas-Leclin, Patrick Georges, Gilles Pauliat, Gerald Roosen

Proceedings Volume 5335, (2004) https://doi.org/10.1117/12.529190

KEYWORDS: Crystals, Laser crystals, Fiber amplifiers, Multimode fibers, Two wave mixing, Diffraction, Amplifiers, Oscillators, Polarization, Nonlinear crystals

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Proceedings Article | 19 November 2003 Paper

Holographic velocimeter for the detection of high amplitude vibrations on rough surfaces

Sebastien de Rossi, Philippe Delaye, Gerald Roosen

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.529710

KEYWORDS: Holography, Signal detection, Crystals, Velocity measurements, Speckle, Modulation, Holograms, Gallium arsenide, Sensors, Scattering

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Proceedings Article | 27 May 2003 Paper

Dynamic holographic interferometry with photorefractive crystals: review of applications and advanced techniques

Marc Georges, Cedric Thizy, Veronique Scauflaire, Sebastien Ryhon, Gilles Pauliat, Philippe Lemaire, Gerald Roosen

Proceedings Volume 4933, (2003) https://doi.org/10.1117/12.516646

KEYWORDS: Crystals, Holography, Laser crystals, Holographic interferometry, Diffraction, Holograms, Cameras, Vibrometry, Scattering, Visualization

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SPIE Journal Paper | 1 November 2002

Polarization holography with photoinduced anisotropy in bacteriorhodopsin

Yoshiko Okada-Shudo, Jean-Michel Jonathan, Gerald Roosen

OE, Vol. 41, Issue 11, (November 2002) https://doi.org/10.1117/12.10.1117/1.1510746

KEYWORDS: Polarization, Diffraction gratings, Holography, Diffraction, Modulation, Wave plates, Anisotropy, Holograms, Far-field diffraction, Molecular photonics

Proceedings Article | 2 March 2001 Paper

Intracavity self-adapted photorefractive Fabry-Perot

Nicolas Dubreuil, Laurent Meilhac, Stephane Victori, Gilles Pauliat, Patrick Georges, Alain Brun, Jean-Michel Jonathan, Gerald Roosen

Proceedings Volume 4353, (2001) https://doi.org/10.1117/12.417726

KEYWORDS: Crystals, Fabry–Perot interferometers, Laser crystals, Modes of laser operation, Continuous wave operation, Mirrors, Reflectivity, Optical filters, Output couplers, Pulsed laser operation

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Proceedings Article | 24 May 2000 Paper

Photorefractive neural network performing a topological map

Yann Frauel, Gilles Pauliat, A. Villing, Gerald Roosen

Proceedings Volume 4089, (2000) https://doi.org/10.1117/12.386886

KEYWORDS: Crystals, Neural networks, Neurons, Holography, Holograms, Volume holography, Laser crystals, Cameras, Spatial light modulators, Modulation

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Proceedings Article | 22 May 2000 Paper

Detection of high-amplitude vibrations on rough surfaces using a photorefractive velocimeter

Philippe Delaye, Sebastien de Rossi, Gerald Roosen

Proceedings Volume 4072, (2000) https://doi.org/10.1117/12.386743

KEYWORDS: Crystals, Phase modulation, Sensors, Laser crystals, Signal detection, Beam splitters, Two wave mixing, Holograms, Holographic materials, Wave plates

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Proceedings Article | 20 September 1999 Paper

Reciprocity and conjugation fidelity in double phase conjugate mirrors

Philippe Delaye, Andrei Fotiadi, Gerald Roosen

Proceedings Volume 3801, (1999) https://doi.org/10.1117/12.363924

KEYWORDS: Phase conjugation, Mirrors, Wave propagation, Signal detection, Crystals, Multimode fibers, Single mode fibers, Optical filters, Diffraction, Polarization

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Proceedings Article | 6 July 1999 Paper

Detached growth of CdTe:Zn:V (STS-95): preliminary results

Michael Fiederle, Tobias Feltgen, J. Joerger, Klaus-Werner Benz, Thierry Duffar, P. Dussere, Ernesto Dieguez, Jean-Claude Launay, Gerald Roosen

Proceedings Volume 3792, (1999) https://doi.org/10.1117/12.351272

KEYWORDS: Crystals, Dewetting, Zinc, Semiconductors, X-rays, Solids, Vanadium, Surface roughness, Sensors, X-ray imaging

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Proceedings Article | 29 April 1999 Paper

State of the art in laser ultrasonic sensors using nonlinear optics

Philippe Delaye, Gerald Roosen

Proceedings Volume 3729, (1999) https://doi.org/10.1117/12.346777

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Proceedings Article | 4 December 1998 Paper

Optimization of reflectivity, rise time and fidelity of a self-pumped phase conjugate BaTiO3:Rh ring mirror at 1.06 um

Nicolas Huot, Jean-Michel Jonathan, Gilles Pauliat, Daniel Rytz, Gerald Roosen

Proceedings Volume 3491, (1998) https://doi.org/10.1117/12.328608

KEYWORDS: Phase conjugation, Mirrors, Reflectivity, Crystals, Ferroelectric materials, Rhodium, Laser sources, Wavefronts, Nd:YAG lasers

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It is now well known that rhodium doped barium titanate (BaTiO3:Rh) exhibits a significant photorefractive response at near infrared wavelengths .We studied and characterized this crystal at 1 .06 jtm by two-wave mixing experiments. In a 45°-cut crystal with a low absorption (0.1 cm1), we measured a photorefractive gain F of 23 cm1 with cw illumination and 16.6 cm1 with nanosecond illumination. Using spectroscopic determinations of the photorefractive sites 2(Rh3+, Rh4+, RhS+), we demonstrated that the photorefractive properties of BaTiO3:Rh are well described by a three charge state model '. Internal parameters of the material were derived using these experimental characterizations which allowed to accurately predict its performances at 1 .06 tm. Comparative characterizations of several BaTiO3 :Rh samples proved that this material is now well reproducible. Reproducibility, high photorefractive gain, low absorption and accurate theoretical description make BaTiO3:Rh a good candidate for realization and optimization of non linear functions like optical phase conjugation. The application we are interested in, is the dynamic wavefront correction of nanosecond Nd:YAG master-oscillator power amplifier (MOPA) laser sources. We implemented a ring self-pumped phase conjugate mirror using a BaTiO3:Rh crystal . This geometry brings several advantages. The threshold in terms of "gain X interaction length" product, is low (F1=2) 6 This phase conjugate mirror does not require a source of long coherence length 7and the gratings involved in the four wave mixing process can be well controled. Moreover the phase conjugate beam can be efficiently selected among the backscattered light by inserting optical elements in the ring 8,9• Such a self-pumped mirror is self-starting and the four-wave mixing process is initiated by the beam-fanning. To avoid spurious internal oscillations in total reflection on the crystal faces that initially developed in several of our experiments and prevented phase conjugation we optimized the geometry of the crystal. Roof-cut, 45° orientation of the c axis and antireflection coatings of the crystal suppressed these internal oscillations and efficient phase conjugation was demonstrated.

Proceedings Article | 9 October 1998 Paper

Self-pumped phase conjugate BaTiO3:Rh ring mirror at 1.06 um: optimization of reflectivity, rise time, and fidelity

Nicolas Huot, Jean-Michel Jonathan, Gilles Pauliat, Daniel Rytz, Gerald Roosen

Proceedings Volume 3470, (1998) https://doi.org/10.1117/12.326849

KEYWORDS: Phase conjugation, Mirrors, Reflectivity, Crystals, Ferroelectric materials, Laser sources, Rhodium, Four wave mixing, Laser crystals

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Proceedings Article | 22 May 1998 Paper

Influence of the limited contrast of SLMs on the storage capacity of dynamic holograms

Yann Frauel, Gilles Pauliat, Gerald Roosen

Proceedings Volume 3490, (1998) https://doi.org/10.1117/12.308883

KEYWORDS: Spatial light modulators, Holograms, Image processing, Signal processing, Signal to noise ratio, Holography, Modulation, Multiplexing, Optical storage, Data storage

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Proceedings Article | 22 September 1997 Paper

Photorefractive detection of ultrasound

Philippe Delaye, Alain Blouin, Louis-Anne de Montmorillon, Denis Drolet, Jean-Pierre Monchalin, Gerald Roosen

Proceedings Volume 3137, (1997) https://doi.org/10.1117/12.287778

KEYWORDS: Crystals, Signal detection, Ultrasonics, Phase conjugation, Sensors, Heterodyning, Beam splitters, Laser crystals, Wavefronts, Ultrasonography

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Proceedings Article | 18 September 1996 Paper

Detection of ultrasonic vibrations on rough surfaces through the photorefractive effect

Philippe Delaye, Alain Blouin, Louis-Anne de Montmorillon, Ivan Biaggio, Denis Drolet, Jean-Pierre Monchalin, Gerald Roosen

Proceedings Volume 2782, (1996) https://doi.org/10.1117/12.250776

KEYWORDS: Signal detection, Photorefraction, Ultrasonics, Wavefronts, Phase conjugation, Heterodyning, Oscillators, Homodyne detection, Mirrors, Ultrasonography

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Proceedings Article | 10 August 1994 Paper

Laser-induced free carrier and photorefractive nonlinearities in semiconductors with deep traps

Philippe Delaye, L. Bastiene, Kestutis Jarasiunas, Gerald Roosen

Proceedings Volume 2097, (1994) https://doi.org/10.1117/12.183179

KEYWORDS: Crystals, Modulation, Picosecond phenomena, Gallium arsenide, Diffraction gratings, Semiconductors, Absorption, Laser applications, Pulsed laser operation, Diffusion

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Light induced changes of optical properties are in close relation with photoelectrical properties of semiconductors. From the dynamics of nonlinear optical response, not only electronic parameters of crystals but also the channels of energy relaxation, role of defects and mechanisms of light interaction with matter may be studied. Light diffraction on laser induced transient gratings has proved to be a very powerful technique for these fundamental swdies of semiconductors as well as for their applications in opto- and microelectronics. Photorefractive Ill-V and il-VI semiconducting compounds reveal optical nonlinearities of different origins under excitation by short las pulses or by CW lasers [1,2]. The contributions to refractive index modulation by free carriers and by space charge electric fields coexist at pulse excitation while solely linear electrooptic effect is responsible for optical gain in a quasi-stationary case of excitation. Carrier plasma kinetic coefficients, as ambipolar and monopolar mobiities, carrier concentrations and lifetimes, defect concentration and other parameters may be obtained from light diffraction on transient grating experiments [3-7]. In addition, at short pulse excitation a number of novel effects have been obsved: light induced space-charge (SC) field enhancement [8], fast oscillations of diffraction efficiency and multiexponential grating decay [9,10]. These effects probably arise from simultaneous presence of two refractive index modulation mechanisms and their interaction. Indeed, the diffusive decay of free carrier grating leads to the build-up of space charge electric fields, which in turn involve electron and hole sal separation, screening of space charge fields, and affect the decay processes of electronic gratings. A significant step towards the understanding of the temporal behavior of nonlinearities involved as well as possibilities of those optical techniques for semiconductor research may be obtained by help of a detail analysis of carrier and field dynamics in different experimental situations.

Proceedings Article | 28 April 1994 Paper

Photorefractive memories for optical processing and computing

C. Alves, Phannara Aing, Gilles Pauliat, Gerald Roosen

Proceedings Volume 10270, 102700E (1994) https://doi.org/10.1117/12.178620

KEYWORDS: Optical signal processing, Holography, Crystals

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Proceedings Article | 12 July 1993 Paper

Refreshing procedure for nondestructive readout of dynamic photorefractive memories

Sylvain Boj, Gilles Pauliat, Gerald Roosen

Proceedings Volume 1806, (1993) https://doi.org/10.1117/12.147857

KEYWORDS: Crystals, Image retrieval, Mirrors, Optically addressed spatial light modulators, Optoelectronics, Spatial light modulators, Holography, Camera shutters, Image processing, Feedback loops

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Proceedings Article | 30 October 1992 Paper

Photorefractive dynamic memories for optical processing: performances and limitations (Invited Paper)

Gilles Pauliat, Gerald Roosen

Proceedings Volume 1812, (1992) https://doi.org/10.1117/12.131202

KEYWORDS: Crystals, Modulation, Holograms, Diffraction, Holography, Spatial light modulators, Optical computing, Computer programming, Ferroelectric materials, Diffraction gratings

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Proceedings Article | 1 October 1991 Paper

Novel technique for efficient wave mixing in photorefractive materials

Pierre Mathey, Jean-Claude Launay, Gilles Pauliat, Gerald Roosen

Proceedings Volume 1500, (1991) https://doi.org/10.1117/12.46844

KEYWORDS: Crystals, Two wave mixing, Laser beam diagnostics, Iron, Phase conjugation, Power supplies, Modulation, Terbium, Electrons, Charge-coupled devices

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Proceedings Article | 1 February 1991 Paper

Nonlinear energy transfer between nanosecond pulses in iron-doped InP crystals

Gerald Roosen

Proceedings Volume 1362, (1991) https://doi.org/10.1117/12.24524

KEYWORDS: Absorption, Crystals, Iron, Optoelectronic devices, Physics, Modulation, Energy transfer, Nonlinear crystals, Electro optics, Photorefraction

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Proceedings Article | 1 August 1990 Paper

Determination of photoionization cross sections, diffusion lengths, and deep-level concentrations in semi-insulating InP and GaAs through energy-transfer measurements

Philippe Delaye, Gerald Roosen

Proceedings Volume 1273, (1990) https://doi.org/10.1117/12.20461

KEYWORDS: Gallium arsenide, Crystals, Iron, Diffusion, Photorefraction, Absorption, Nonlinear optical materials, Laser crystals, Energy transfer, Nonlinear crystals

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Proceedings Article | 1 August 1990 Paper

Dynamic grating generated from EL2 level in semi-insulating GaAs by nanosecond pulses

Laurent Disdier, Gerald Roosen

Proceedings Volume 1273, (1990) https://doi.org/10.1117/12.20460

KEYWORDS: Reflectivity, Gallium arsenide, Absorption, Neodymium, Modulation, Four wave mixing, Diffusion, Nonlinear optical materials, Plasma, Nonlinear optics

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Showing 5 of 31 publications

Proceedings Volume Editor (1)

SPIE Conference Volume | 8 March 1989

Nonlinear Optical Materials

Conference Committee Involvement (12)

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VII

25 August 2013 | San Diego, California, United States

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VI

12 August 2012 | San Diego, California, United States

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications V

21 August 2011 | San Diego, California, United States

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications IV

1 August 2010 | San Diego, California, United States

Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications III

2 August 2009 | San Diego, California, United States

Showing 5 of 12 Conference Committees

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