Dr. Yves Eugene Lutz Profile

Dr. Yves Eugene Lutz

Research Associate at ISL

SPIE Involvement:

Author

Publications (9)

Proceedings Article | 10 October 2019 Presentation + Paper

60 years of advanced imaging at ISL: from the Cranz-Schardin camera to non-line-of-sight imaging

F. Christnacher, M. Laurenzis, Y. Lutz, A. Matwyschuk

Proceedings Volume 11160, 1116007 (2019) https://doi.org/10.1117/12.2533902

KEYWORDS: Imaging systems, Visualization, Cameras, 3D modeling, Holography, Photons, Semiconductor lasers, 3D image reconstruction, Computational imaging, Sensors

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Proceedings Article | 9 October 2018 Presentation + Paper

Portable bi-λ SWIR/NIR GV gated viewing system for surveillance and security applications

F. Christnacher, E. Bacher, N. Metzger, S. Schertzer, Y. Lutz, J.-M. Poyet, M. Laurenzis

Proceedings Volume 10796, 1079608 (2018) https://doi.org/10.1117/12.2325163

KEYWORDS: Goggles, Short wave infrared radiation, Surveillance, Sensors, Skin, Imaging systems, Laser sources

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Proceedings Article | 6 October 2017 Presentation + Paper

Shortwave infrared laser range-gated viewing based on accumulation mode

Yves Lutz, Emmanuel Bacher, Stephane Schertzer

Proceedings Volume 10433, 104330N (2017) https://doi.org/10.1117/12.2278883

KEYWORDS: Short wave infrared radiation, Imaging systems, Fiber optic illuminators, Near infrared, Solid state lasers, Semiconductor lasers, Infrared imaging, Laser development

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SPIE Journal Paper | 11 July 2016

Light pipe design method and stepper experimentation for interference effects reduction in laser illumination

Jean-Michel Poyet, Yves Lutz

OE, Vol. 55, Issue 07, 075103, (July 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.7.075103

KEYWORDS: Fiber optic illuminators, Speckle, Light, Laser systems engineering, Illumination engineering, Sensors, Neon, Optics manufacturing, Homogenization, Nd:YAG lasers

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Proceedings Article | 13 October 2015 Paper

Methodology for the conception of speckle reduction elements in the case of short pulse illumination

Yves Lutz, Jean-Michel Poyet

Proceedings Volume 9649, 96490L (2015) https://doi.org/10.1117/12.2193744

KEYWORDS: Speckle, Semiconductor lasers, Laser sources, Nd:YAG lasers, Michelson interferometers, Polymethylmethacrylate, Chemical elements, Fiber optic illuminators, Laser resonators, Laser development

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One of the most efficient ways to decrease the speckle contrast in the field of laser illumination is to increase the spatial diversity of coherent laser sources. For very short laser pulses such as those required for flash laser imaging, the spatial diversity should take place instantaneously and no time averaging effect can be used. The spatial diversity is realized by sampling the laser beam into m beamlets with increased optical path length. This path length has to be greater than or equal to the coherence length of the laser beam. In this case, the beamlets are no longer able to create interferences which each other. According to the Goodman’s theory of speckle reduction, the speckle contrast is then reduced by a factor of 1/√m. Unfortunately, in the case of multimode lasers, the number of uncorrelated beamlets is not infinite but is limited by a periodicity function resulting from the laser resonator length itself. The speckle reduction possibility is therefore limited and is directly linked to each laser source where the coherence length and cavity length are defined. In this work we present a methodology to determine experimentally the optical path length difference as well as the number of beamlets for de-speckling a laser source. An experimental realization is presented where both, coherence length and periodicity function are measured with a Michelson interferometer where only the speckle contrast of the two beams from each arm is analyzed. For the validation of the method, the chosen laser source is a single emitter 660 nm laser diode. Two cylindrical steppers made with diamond turned PMMA have been realized. Both elements yield interesting results with close values and in accordance with the theory of spatial diversity. The speckle contrast could be reduced from about 10% to a value close to 4%. These values confirm and validate the methodology presented in this work. Steppers can also be a promising solution for the reduction of interference fringes which appear when using a lightpipe in a laser illuminator design.

Proceedings Article | 25 October 2013 Paper

Comparison of three methods reducing the beam parameter product of a laser diode stack for long range laser illumination applications

Yves Lutz, Jean-Michel Poyet, Nicolas Metzger

Proceedings Volume 8896, 889608 (2013) https://doi.org/10.1117/12.2028635

KEYWORDS: Semiconductor lasers, Fiber optic illuminators, Beam shaping, Polarization, Laser applications, Collimation, Mirrors, Optical simulations, Glasses, Laser sources

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Proceedings Article | 19 November 2012 Paper

Range-gated imaging with speckle-free and homogeneous laser illumination

Martin Laurenzis, Jean Poyet, Yves Lutz, Alexis Matwyschuk, Frank Christnacher

Proceedings Volume 8542, 854203 (2012) https://doi.org/10.1117/12.971433

KEYWORDS: Waveguides, Ray tracing, Laser applications, Imaging systems, Solid state lasers, Laser sources, Waveguide lasers, Speckle imaging, Short wave infrared radiation, Speckle

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SPIE Journal Paper | 7 May 2012

Homogeneous and speckle-free laser illumination for range-gated imaging and active polarimetry

Martin Laurenzis, Yves Lutz, Frank Christnacher, Alexis Matwyschuk, Jean-Michel Poyet

OE, Vol. 51, Issue 6, 061302, (May 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.6.061302

KEYWORDS: Speckle, Waveguides, Polarimetry, Semiconductor lasers, Solid state lasers, Imaging systems, Homogenization, Illumination engineering, Sensors, Laser sources

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Proceedings Article | 21 September 2011 Paper

Near infrared laser illuminator for very long-range flash active imaging applications

Yves Lutz, Nicolas Metzger

Proceedings Volume 8170, 81700C (2011) https://doi.org/10.1117/12.896312

KEYWORDS: Semiconductor lasers, Fiber optic illuminators, Diffusers, Collimation, Lenses, Diodes, Laser applications, Pulsed laser operation, Homogenization, Laser sources

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Showing 5 of 9 publications

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