Dr. Christelle Kieleck Profile

Dr. Christelle Kieleck

at Fraunhofer-IOSB

SPIE Involvement:

Conference Program Committee | Author

Publications (42)

Proceedings Article | 13 March 2024 Presentation

High repetition rate pulsed all-in-fiber thulium doped fiber MOPA for OPO pumping

Dominik Lorenz, Clément Romano, Dieter Panitzek, Patrick Forster, Julian Schneider, Jan Lautenschläger, Marc Eichhorn, Christelle Kieleck

Proceedings Volume PC12869, PC1286909 (2024) https://doi.org/10.1117/12.3003070

KEYWORDS: Optical parametric oscillators, Thulium, Semiconductor lasers, Modulation, Laser frequency, Bragg cells, Semiconductors, Pulsed laser operation, Pulse signals, Pulse shaping

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Proceedings Article | 13 March 2024 Poster

Tiled aperture coherent beam combination of 2 μm fiber lasers

Clément Romano, Dieter Panitzek, Gabriel Pradat-Peyre, Simon Milcent, Jashaani Uthayakumar, Marc Eichhorn, Christelle Kieleck

Proceedings Volume PC12865, PC128650S (2024) https://doi.org/10.1117/12.3001690

KEYWORDS: Fiber lasers, Coherent beam combination, Free space, Wave propagation, Transverse mode instability, Telecommunications, Standards development, Remote sensing, Laser sources, LIDAR

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Proceedings Article | 13 March 2024 Poster

Simulation and investigation of conduction-driven thermal blooming at 2055 nm

Dominik Lorenz, Marius Rupp, Dieter Panitzek, Clément Romano, Patrick Forster, Julian Schneider, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12877, 128771V (2024) https://doi.org/10.1117/12.3003038

KEYWORDS: Thermal blooming, Semiconductor lasers, Light absorption, Emission wavelengths, Distortion, Carbon dioxide, Atmospheric propagation, Air temperature, Semiconductors, Refractive index

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Proceedings Article | 12 March 2024 Paper

14 W linear ZGP OPO pumped by a Q-switched Ho3+:YAG laser with a maximum energy of 2.2 mJ

Katharina Goth, Madeleine Eitner, Michael Griesbeck, Marius Rupp, Johannes Deutsch, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12869, 1286906 (2024) https://doi.org/10.1117/12.2692202

KEYWORDS: Resonators, Optical parametric oscillators, Holmium, YAG lasers, Q switched lasers, Nonlinear crystals, Laser resonators

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Proceedings Article | 12 March 2024 Paper

12.2 W ZGP OPO pumped by a Q-Switched Tm3+:Ho3+-codoped fiber laser

Patrick Forster, Jan Lautenschläger, Dominik Lorenz, Julian Schneider, Dieter Panitzek, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12869, 1286905 (2024) https://doi.org/10.1117/12.3002253

KEYWORDS: Optical parametric oscillators, Fiber lasers, Mid-IR, Q switched lasers, Holmium, Thulium, Pulsed laser operation

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Proceedings Article | 12 March 2024 Poster + Paper

Temperature investigation of a multiwatt thulium-doped fiber laser

Dieter Panitzek, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12865, 128651D (2024) https://doi.org/10.1117/12.3001683

KEYWORDS: Thulium, Short wave infrared radiation, Fiber lasers, Temperature metrology, Optical simulations

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Proceedings Article | 12 March 2024 Presentation + Paper

High-pulse-energy actively Q-switched Tm-doped photonic crystal fiber laser operating at 2050 nm with narrow linewidth

Julian Schneider, Hugo Lassiette, Dominik Lorenz, Patrick Forster, Jan Lautenschläger, Dieter Panitzek, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12865, 1286517 (2024) https://doi.org/10.1117/12.3002397

KEYWORDS: Thulium, Fiber lasers, Emission wavelengths, Q switching, Beam diameter, Photonic crystal fibers, Q switched lasers, Semiconductor lasers, Laser crystals, Gaussian pulse

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Proceedings Article | 12 March 2024 Presentation + Paper

Advanced numerical simulation model for end‑pumped Ho3+:YAG laser resonators

Marius Rupp, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12864, 128640H (2024) https://doi.org/10.1117/12.2690256

KEYWORDS: Laser resonators, YAG lasers, Holmium, Optical simulations, Crystals, Resonators, Laser crystals, Beam propagation method, Pulsed laser operation

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Proceedings Article | 23 October 2023 Paper

Recent advances in high-power 2 µm fiber lasers systems

Clément Romano, Dieter Panitzek, Dominik Lorenz, Patrick Forster, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12739, 1273903 (2023) https://doi.org/10.1117/12.2684310

KEYWORDS: Fiber lasers, Laser systems engineering, Coherent beam combination, High power lasers, Photodiodes, Phase modulation, Field programmable gate arrays, Fiber amplifiers, Electrooptic modulators

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Proceedings Article | 23 October 2023 Paper

Investigation of the polymer material perforation time: comparison between two fiber laser wavelengths

Clément Romano, Gunnar Ritt, Michael Henrichsen, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12739, 1273909 (2023) https://doi.org/10.1117/12.2684318

KEYWORDS: Thulium, Polymers, Fiber lasers, Laser sources, Laser beam propagation, Beam diameter, Color, Cameras, Wave propagation, Materials processing, Ytterbium

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Proceedings Article | 23 October 2023 Paper

Investigation of the temperature dependence of core-pumped 2 µm thulium-doped fiber lasers

Dieter Panitzek, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12738, 127380D (2023) https://doi.org/10.1117/12.2684068

KEYWORDS: Thulium, Optical fibers, Fiber lasers, Optical simulations

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Proceedings Article | 23 October 2023 Paper

Power scaling of segmented and homogeneously doped Ho^{3+}:YAG laser resonators

Katharina Goth, Marius Rupp, Michael Griesbeck, Madeleine Eitner, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12738, 127380E (2023) https://doi.org/10.1117/12.2682141

KEYWORDS: Crystals, Resonators, Laser crystals, Laser resonators, YAG lasers, Holmium, Q switching

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Proceedings Article | 23 October 2023 Presentation + Paper

Gated viewing at 2.09 µm laser wavelength: experimental system assessment and comparison to 1.57 µm

Benjamin Göhler, Peter Lutzmann, Dominik Walter, Helge Bürsing, Johannes Deutsch, Marc Eichhorn, Christelle Kieleck, Alexander Sieck, Robert Wiegleb

Proceedings Volume 12737, 127370C (2023) https://doi.org/10.1117/12.2684727

KEYWORDS: Short wave infrared radiation, Reflectivity, Cameras, Pulsed laser operation, Light sources and illumination, Calibration, Scintillation, Pulse signals, Mercury cadmium telluride, Holmium

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Proceedings Article | 8 March 2023 Paper

Q-switched Ho3+:YAG Porro resonators with improved alignment stability

Katharina Goth, Michael Griesbeck, Madeleine Eitner, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 12399, 1239909 (2023) https://doi.org/10.1117/12.2652592

KEYWORDS: Prisms, Laser resonators, Q switching, Holmium

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Proceedings Article | 4 March 2022 Presentation + Paper

Three-stage MOPA 2 µm fiber laser for ZGP OPO pumping

Dominik Lorenz, Clément Romano, Dieter Panitzek, Patrick Forster, Julian Schneider, Hendrik Büker, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11985, 119850H (2022) https://doi.org/10.1117/12.2610238

KEYWORDS: Mid-IR, Optical parametric oscillators, Amplifiers, Fiber lasers, Crystals, Semiconductor lasers, Optical fibers, Thulium

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Proceedings Article | 12 April 2021 Presentation + Paper

Watt-level thulium:holmium-codoped versus holmium-doped polarization-maintaining fiber amplifier at 2050 and 2090 nm

Clément Romano, Dominik Lorenz, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11724, 117240I (2021) https://doi.org/10.1117/12.2587919

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Proceedings Article | 5 March 2021 Presentation + Paper

Q-switched, high average output power Tm3+:Ho3+-codoped triple-clad fiber laser for nonlinear frequency conversion

Patrick Forster, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11670, 116700E (2021) https://doi.org/10.1117/12.2578104

KEYWORDS: Fiber lasers, Q switched lasers, Nonlinear frequency conversion, Surgery, Optical parametric oscillators, Mid-IR, Solid state lasers, Solid state electronics, Q switching, Polarization

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Proceedings Article | 5 March 2021 Presentation + Paper

kW-class nanosecond pulsed polarized MOPA laser at 2050 and 2090 nm

Clement Romano, Dominik Lorenz, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11670, 1167014 (2021) https://doi.org/10.1117/12.2577180

KEYWORDS: Pulsed laser operation, Fiber lasers, Fiber amplifiers, Supercontinuum generation, Semiconductor optical amplifiers, Semiconductor lasers, Oscillators, Optical amplifiers, Nonlinear optics, Modulation

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Proceedings Article | 5 March 2021 Presentation + Paper

Advances in 2 µm polarization-maintaining thulium-doped Q-switched fiber lasers for frequency conversion into the mid-IR

Julian Schneider, Patrick Forster, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11670, 116700B (2021) https://doi.org/10.1117/12.2577118

KEYWORDS: Thulium, Mid-IR, Frequency conversion, Q switched fiber lasers, Fiber lasers, YAG lasers, Q switched lasers, Surgery, Spectroscopy

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Proceedings Article | 5 March 2021 Presentation + Paper

High-pulse-energy, Q-switched Ho3+:YAG laser for mid-infrared optical parametric oscillator pumping

Michael Griesbeck, Hendrik Büker, Madeleine Eitner, Katharina Goth, Peter Braesicke, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11670, 116700D (2021) https://doi.org/10.1117/12.2582997

KEYWORDS: Optical parametric oscillators, Q switched lasers, Mid-IR, Laser optics, Fiber lasers, Q switches, Pulsed laser operation, Laser crystals, Bragg cells, Quartz

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Proceedings Article | 21 April 2020 Paper

Advances in two-micron lasers for nonlinear conversion into the mid-IR

Patrick Forster, Clément Romano, Christelle Kieleck, Marc Eichhorn

Proceedings Volume 11355, 1135509 (2020) https://doi.org/10.1117/12.2560169

KEYWORDS: Fiber lasers, Holmium, Cladding, Polymers, Thulium, Mid-IR, Frequency conversion

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Proceedings Article | 2 March 2020 Paper

Recent advances in high-power 2 µm fiber lasers for frequency conversion into the mid-IR

Patrick Forster, Clément Romano, Marc Eichhorn, Christelle Kieleck

Proceedings Volume 11264, 112640H (2020) https://doi.org/10.1117/12.2545990

KEYWORDS: Fiber lasers, Holmium, Thulium

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Proceedings Article | 7 March 2019 Presentation + Paper

High power Q-switched Tm3+, Ho3+-codoped 2µm fiber laser and application for direct OPO pumping

Nicolas Dalloz, Thierry Robin, Benoît Cadier, Christelle Kieleck, Marc Eichhorn, Anne Hildenbrand-Dhollande

Proceedings Volume 10897, 108970J (2019) https://doi.org/10.1117/12.2507844

KEYWORDS: Fiber lasers, Optical parametric oscillators, Thulium, Oscillators, Q switched lasers, Holmium, Mid-IR, Pulsed laser operation, Optical fibers, Crystals

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SPIE Journal Paper | 30 November 2018 Open Access

Special Section Guest Editorial: Nonlinear Frequency Conversion

Rita D. Peterson, Christelle Kieleck, Peter G. Schunemann

OE, Vol. 57, Issue 11, 111801, (November 2018) https://doi.org/10.1117/12.10.1117/1.OE.57.11.111801

KEYWORDS: Nonlinear frequency conversion, Optical engineering, Femtosecond phenomena, Fiber lasers, Analytical research, Complex systems, Optical signal processing, Optical spectroscopy, Spectroscopes, Instrument modeling

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Proceedings Article | 11 March 2016 Paper

Generation of broadband mid-infrared supercontinuum radiation in cascaded soft-glass fibers

C. Kneis, T. Robin, B. Cadier, Laurent Brilland, Celine Caillaud, Johann Troles, I. Manek-Hönninger, M. Eichhorn, C. Kieleck

Proceedings Volume 9728, 97282A (2016) https://doi.org/10.1117/12.2209553

KEYWORDS: Optical fibers, ZBLAN, Mid-IR, Chalcogenides, Fiber lasers, Mode locking, Tissue optics, Supercontinuum generation, Q switching, Free space optical communications, Optical filters, Absorption, Dispersion, Collimation

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Proceedings Article | 27 February 2015 Paper

6.5W mid-infrared ZnGeP2 parametric oscillator directly pumped by a Q-switched Tm3+-doped single-oscillator fiber laser

C. Kieleck, A. Berrou, B. Donelan, B. Cadier, Thierry Robin, M. Eichhorn

Proceedings Volume 9347, 93470O (2015) https://doi.org/10.1117/12.2081116

KEYWORDS: Optical parametric oscillators, Fiber lasers, Mid-IR, Q switched lasers, Laser beam propagation, Oscillators, Pulsed laser operation, Phase modulation, Crystals, Mirrors

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Proceedings Article | 20 February 2015 Paper

4.5 W mid-infrared supercontinuum generation in a ZBLAN fiber pumped by a Q-switched mode-locked Tm3+- doped fiber laser

C. Kneis, B. Donelan, A. Berrou, I. Manek-Hönninger, B. Cadier, T. Robin, M. Poulain, F. Joulain, M. Eichhorn, C. Kieleck

Proceedings Volume 9342, 93420B (2015) https://doi.org/10.1117/12.2077215

KEYWORDS: Fiber lasers, Mid-IR, ZBLAN, Mode locking, Q switched lasers, Q switching, Optical fibers, Bragg cells, Optical filters, Continuous wave operation

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Proceedings Article | 7 October 2014 Paper

2 μm and mid-IR fiber-laser-based sources for OCM

C. Kieleck, A. Berrou, C. Kneis, B. Donelan, M. Eichhorn

Proceedings Volume 9251, 92510C (2014) https://doi.org/10.1117/12.2070355

KEYWORDS: Fiber lasers, Optical parametric oscillators, Mode locking, Mid-IR, Continuous wave operation, Q switched lasers, Diodes, Nonlinear crystals, Bragg cells, Q switching

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This paper describes new laser sources and non linear conversion setups for 2 μm and mid-IR generation based on fiber technologies developed at ISL. Especially for jamming heat-seeking missiles, these novel designs allow to propose future compact, efficient and integrable laser systems. The specialty of the ISL technology lies in the use of single 2 μm fiber laser oscillators, which deliver the full output peak power to pump optical parametric oscillators or nonlinear fibers. No multi-stage amplifiers at 2 μm or 1.55 μm are necessary to efficiently pump non linear converters to obtained useful energies in the mid-infrared spectral range. This technology leads to efficient, simple and promising setups to be implemented in flying platforms. The best results achieved in continuous-wave (CW), Q-switched (QS) and mode-locked (ML) regimes with fiber lasers based on Tm³⁺-doped and Tm3+,Ho³⁺-codoped fibers are presented. Up to 70 W of average power was achieved around 2 μm with a Tm³⁺-doped fiber in CW regime. In ML regimes, at a repetition rate of 66 MHz, 50 W of average power was reached. In QS regime, up to 32 W of average power was generated around 2 μm with a polarization maintaining Tm³⁺-doped fiber at a repetition rate of 40 kHz. With a Tm³⁺,Ho³⁺-codoped fiber, up to 25 W of average power was obtained around 2070 nm in Q-switched regime. For example at 50 kHz, the pulse duration was around 50 ns at the maximum output power. The M² was estimated to be less than 1.2. The emission from QS fiber lasers was used to directly pump OP-GaAs and ZGP OPOs. For example, in band II, up to 6.5 W of averaged power was recently obtained from a ZGP OPO pumped by a Tm³⁺-doped fiber laser. At 40 kHz repetition rate, the pulse duration was around 65 ns at the maximum output power. For 3 W of averaged output power, the M² of the signal beam was estimated to be less than 2.1 and less than 2.4 for the idler beam. Using a mode-locked Tm³⁺-doped fiber laser to pump a ZBLAN fiber at an injection efficiency of ~60%, an overall supercontinuum power of up to 2.2 W from a pump power of 5.4 W was achieved. The power above 2650 nm was 0.7 W.

SPIE Journal Paper | 21 August 2014

Laser damage of the nonlinear crystals CdSiP₂ and ZnGeP₂ studied with nanosecond pulses at 1064 and 2090 nm

Anne Hildenbrand, Christelle Kieleck, Aleksey Tyazhev, Georgi Marchev, Georg Stöppler, Marc Eichhorn, Peter Schunemann, Vladimir Panyutin, Valentin Petrov

OE, Vol. 53, Issue 12, 122511, (August 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.12.122511

KEYWORDS: Optical parametric oscillators, Nonlinear crystals, Crystals, Laser induced damage, Laser damage threshold, Absorption, Mid-IR, Transparency, Laser crystals, Optical engineering

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Proceedings Article | 20 February 2014 Paper

Laser damage studies of CdSiP2 and ZnGeP2 nonlinear crystals with nanosecond pulses at 1064 and 2090 nm

Anne Hildenbrand, Christelle Kieleck, Aleksey Tyazhev, Georgi Marchev, Georg Stöppler, Marc Eichhorn, Peter Schunemann, Valentin Petrov

Proceedings Volume 8964, 896417 (2014) https://doi.org/10.1117/12.2039050

KEYWORDS: Optical parametric oscillators, Crystals, Laser induced damage, Absorption, Nonlinear crystals, Laser damage threshold, Mid-IR, Laser crystals, Transparency, Crystallography

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Proceedings Article | 15 October 2013 Paper

Compact high-power/high-energy 2 μm and mid-infrared laser sources for OCM

C. Kieleck, A. Hildenbrand, M. Schellhorn, G. Stoeppler, M. Eichhorn

Proceedings Volume 8898, 889809 (2013) https://doi.org/10.1117/12.2031662

KEYWORDS: Optical parametric oscillators, Laser sources, Crystals, Mid-IR, Optical amplifiers, Oscillators, Laser systems engineering, Nonlinear crystals, Laser crystals, Laser development

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Proceedings Article | 16 February 2012 Paper

High-average-power actively-mode-locked Tm3+ fiber lasers

Michael Eckerle, Christelle Kieleck, Philipp Hübner, Jacek Świderski, Stuart Jackson, Gwenael Mazé, Marc Eichhorn

Proceedings Volume 8237, 823740 (2012) https://doi.org/10.1117/12.906649

KEYWORDS: Mode locking, Fiber lasers, Q switching, YAG lasers, Q switched lasers, Continuous wave operation, Pulsed laser operation, Mid-IR, Supercontinuum generation, Picosecond phenomena

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Proceedings Article | 7 October 2011 Paper

Compact efficient mid-infrared laser source: OP-GaAs OPO pumped by Ho3+:YAG laser

A. Hildenbrand, C. Kieleck, E. Lallier, D. Faye, A. Grisard, B. Gérard, M. Eichhorn

Proceedings Volume 8187, 81870H (2011) https://doi.org/10.1117/12.898118

KEYWORDS: Optical parametric oscillators, Crystals, Modulation, Mid-IR, Nonlinear crystals, Laser sources, Laser crystals, Laser damage threshold, Gallium arsenide, Laser development

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Proceedings Article | 12 October 2010 Paper

OP-GaAs OPO pumped by 2µm Q-switched lasers: Tm;Ho:silica fiber laser and Ho:YAG laser

C. Kieleck, A. Hildenbrand, M. Eichhorn, D. Faye, E. Lallier, B. Gérard, S. Jackson

Proceedings Volume 7836, 783607 (2010) https://doi.org/10.1117/12.865217

KEYWORDS: Optical parametric oscillators, Fiber lasers, Q switched lasers, Crystals, Mid-IR, Polarization, Nonlinear crystals, Gallium arsenide, Laser crystals, Laser damage threshold

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Proceedings Article | 12 October 2010 Paper

High-pulse energy Q-switched Tm3+:YAG laser for nonlinear frequency conversion to the mid-IR

Georg Stöppler, Christelle Kieleck, Marc Eichhorn

Proceedings Volume 7836, 783609 (2010) https://doi.org/10.1117/12.864435

KEYWORDS: Pulsed laser operation, Resonators, Reflectivity, Semiconductor lasers, Coating, Q switched lasers, Mid-IR, Laser damage threshold, YAG lasers, Laser systems engineering

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Proceedings Article | 18 February 2010 Paper

Polarization effects and fiber-laser-pumping of a 2-µm-pumped OP-GaAs OPO

C. Kieleck, M. Eichhorn, D. Faye, E. Lallier, S. Jackson

Proceedings Volume 7582, 758212 (2010) https://doi.org/10.1117/12.846917

KEYWORDS: Optical parametric oscillators, Polarization, Fiber lasers, Gallium arsenide, Q switched lasers, Crystals, Fabry–Perot interferometers, Mid-IR, Laser damage threshold, Nonlinear crystals

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Proceedings Article | 13 February 2008 Paper

High efficiency mid-infrared OPO based on low-loss orientation-patterned GaAs samples (OP-GaAs)

David Faye, Eric Lallier, Arnaud Grisard, Bruno Gérard, Christelle Kieleck, Antoine Hirth

Proceedings Volume 6875, 68750G (2008) https://doi.org/10.1117/12.762894

KEYWORDS: Gallium arsenide, Optical parametric oscillators, Mid-IR, Frequency conversion, Infrared radiation, Crystals, Nonlinear optics, Chemical species, Semiconducting wafers, Nonlinear optical materials

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Proceedings Article | 16 October 2007 Paper

Thick low-loss orientation-patterned gallium arsenide (OP-GaAs) samples for mid-infrared laser sources

David Faye, Eric Lallier, Arnaud Grisard, Bruno Gérard, Christelle Kieleck, Antoine Hirth

Proceedings Volume 6740, 67400I (2007) https://doi.org/10.1117/12.737110

KEYWORDS: Gallium arsenide, Optical parametric oscillators, Frequency conversion, Infrared radiation, Semiconducting wafers, Wafer bonding, Crystals, Mid-IR, Nonlinear optics, Chemical species

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Proceedings Article | 4 November 2005 Paper

Evaluation of different configurations of resonant pumped 2 μm-Ho:YAG lasers

Christelle Kieleck, Antoine Hirth, Martin Schellhorn

Proceedings Volume 5989, 598905 (2005) https://doi.org/10.1117/12.630548

KEYWORDS: Holmium, Thulium, Crystals, Bragg cells, Continuous wave operation, Absorption, Semiconductor lasers, Reflectivity, Laser countermeasures, Q switching

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Proceedings Article | 1 September 2004 Paper

Investigations of a Q-switched Ho:YAG laser intracavity-pumped by a diode-pumped Tm:YLF laser

Christelle Kieleck, Antoine Hirth

Proceedings Volume 5460, (2004) https://doi.org/10.1117/12.544615

KEYWORDS: Semiconductor lasers, Holmium, Q switched lasers, Q switching, Bragg cells, Solid state lasers, Optical parametric oscillators, Thulium, Optical amplifiers, Diode pumped solid state lasers

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Q-switched and diode-pumped 2 μm solid state lasers are becoming of increasing interest for efficient pumping of mid-infrared emitting optical parametric oscillators (OPOs). In particular, Thulium and Holmium rare earths seem to be most suited for systems with high efficiency due to their long upper state lifetime. In addition, the Ho:YAG emission around 2.1 μm is not in the strong absorption spectral band of water and it is a suitable wavelength for non linear crystal pumping, such as ZnGeP₂. Several works on Ho:YAG laser end-pumped by diode-pumped Tm:YLF laser have demonstrated high power operations¹. To simplify the set-ups, experiments with Tm-Ho intracavity lasers have been done; they demonstrated a 36.5% slope efficiency². Unfortunately these set-ups³ did not allow Q-switched operations and the thermal lens in the rods led to relatively poor beam quality (M²~5-6). We designed an original intracavity configuration with a dichroic polarizing beamsplitter to decouple Tm:YLF and Ho:YAG cavities. This solution was to improve the beam quality and allow Q-switched operations. 1.9 W of 2.09 μm at the 17.3 W diodes pump level were obtained. The slope efficiency of the diode-pump to the Ho laser output and the optical-to-optical conversion efficiency achieved were respectively ~ 21.4 % and ~ 11 %. As anticipated 4, a shift of Tm:YLF emission was experimentally scaled from 1.908 to 1.953 μm which led to an efficiency decrease for the Tm laser. Unfortunately, in this intracavity geometry, Ho:YAG acted as a saturable absorber. Instead of a cw operation in free running, random Tm:YLF laser pulses of ~ 2.5 μs were observed that each resulted in an Ho pulse (~ 200-250 ns). When the acousto-optic modulator (AOM) worked, the Ho pulses did not follow the Q-switched frequency. In fact Ho emission depends on the Tm:YLF pump energy accumulated between two gates of the AOM. Some possible ways to optimize the efficiency and to avoid the passive Q-switching behaviour of Ho:YAG are tested and first results are presented in this paper.

Proceedings Article | 7 April 2004 Paper

Performances of Ho:YAG laser intracavity-pumped by a diode-pumped Tm:YLF laser

Christelle Kieleck, Antoine Hirth, Martin Schellhorn

Proceedings Volume 5478, (2004) https://doi.org/10.1117/12.558350

KEYWORDS: Semiconductor lasers, Holmium, Q switching, Bragg cells, Optical parametric oscillators, Thulium, Q switched lasers, Solid state lasers, Diode pumped solid state lasers, Mid-IR

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Proceedings Article | 14 January 2002 Paper

Laser-induced fluorescence imaging: application to groups of macroalgae identification

Christelle Kieleck, Bruno Bousquet, Guy Le Brun, Jack Cariou, Jean Lotrian

Proceedings Volume 4488, (2002) https://doi.org/10.1117/12.452811

KEYWORDS: Luminescence, Laser induced fluorescence, Signal attenuation, Optical filters, Cameras, Optical parametric oscillators, Image filtering, In situ metrology, Diagnostics, Pulsed laser operation

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Showing 5 of 42 publications

Conference Committee Involvement (5)

Nonlinear Frequency Generation and Conversion: Materials and Devices XXIV

25 January 2025 | San Francisco, California, United States

Nonlinear Frequency Generation and Conversion: Materials and Devices XXIII

29 January 2024 | San Francisco, California, United States

Nonlinear Frequency Generation and Conversion: Materials and Devices XXII

30 January 2023 | San Francisco, California, United States

Nonlinear Frequency Generation and Conversion: Materials and Devices XXI

24 January 2022 | San Francisco, California, United States

Nonlinear Frequency Generation and Conversion: Materials and Devices XX

6 March 2021 | Online Only, California, United States

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