Prof. Christoph Pflaum Profile

Prof. Christoph Pflaum

at ASLD GmbH and FAU

SPIE Involvement:

Author

Publications (41)

Proceedings Article | 17 June 2024 Presentation + Paper

Simulation of solid-state lasers with temperature and wavelength dependent absorption and emission

Souryadeep Saha, Jacob Mackenzie, Christoph Pflaum

Proceedings Volume 13023, 1302303 (2024) https://doi.org/10.1117/12.3016718

KEYWORDS: Absorption, Nd:YAG lasers, Optical simulations, Crystals, Ray tracing, Spectroscopy, Light absorption, Temperature metrology, Laser crystals, Finite element methods

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Proceedings Article | 26 May 2022 Presentation + Paper

Computation of Kerr lensing effect in laser amplifiers

Christoph Pflaum

Proceedings Volume 12143, 1214309 (2022) https://doi.org/10.1117/12.2620926

KEYWORDS: Kerr effect, Laser amplifiers, Amplifiers, Refraction, Gaussian beams, Beam shaping, Optical simulations, Nd:YAG lasers, Dispersion, Crystals

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Proceedings Article | 18 October 2021 Presentation + Paper

Simulation and compensation of thermal lensing in high-power optical systems

Phillip Lino Rall, Christoph Pflaum

Proceedings Volume 11875, 118750E (2021) https://doi.org/10.1117/12.2600184

KEYWORDS: Optical components, Scanners, Absorption, Thermography, Thermal effects, Refractive index, Refraction, Ray tracing, Mirrors, Geometrical optics

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Proceedings Article | 29 May 2018 Paper

3D ray tracing model for laser beams influenced by thermal lensing in solid-state gain media

Phillip Lino Rall, Ramon Springer, Christoph Pflaum

Proceedings Volume 10694, 106940S (2018) https://doi.org/10.1117/12.2311840

KEYWORDS: Crystals, Ray tracing, Laser crystals, Optical simulations, Polarization, Beam shaping, Birefringence, Amplifiers, Wave propagation, Beam propagation method

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Proceedings Article | 28 May 2018 Paper

Efficient optical simulation of nano structures in thin-film solar cells

Julian Hornich, Georg Hager, Christoph Pflaum

Proceedings Volume 10694, 106940R (2018) https://doi.org/10.1117/12.2312545

KEYWORDS: Optical simulations, Solar cells, Computer simulations, Particles, Thin film solar cells, Silver

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Proceedings Article | 17 May 2018 Paper

Influence of interionic energy transfer mechanisms in Tm,Ho:YAG on the maximum extractable energy in regenerative amplifiers

Ramon Springer, Tyndale Hannan, Christoph Pflaum

Proceedings Volume 10683, 106832K (2018) https://doi.org/10.1117/12.2306235

KEYWORDS: Holmium, Thulium, Energy transfer, Upconversion, Ions, Optical amplifiers, Numerical simulations, Solid state physics, Pulsed laser operation, Electrons

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Proceedings Article | 17 May 2018 Paper

Dynamic mode analysis with arbitrary rate equations

Christoph Pflaum, Ramon Springer

Proceedings Volume 10683, 106832O (2018) https://doi.org/10.1117/12.2306394

KEYWORDS: Crystals, Chromium, Er:YAG lasers, Upconversion, Optical simulations, Resonators, Computer simulations, Photons, Energy transfer, Nd:YAG lasers

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Proceedings Article | 15 February 2018 Presentation + Paper

Simulation of energy buildups in solid-state regenerative amplifiers for 2-μm emitting lasers

Ramon Springer, Ilya Alexeev, Johannes Heberle, Christoph Pflaum

Proceedings Volume 10511, 1051106 (2018) https://doi.org/10.1117/12.2287769

KEYWORDS: Optical amplifiers, Amplifiers, Systems modeling, Computer simulations, Crystals, Upconversion, Data modeling, Solid state lasers, Absorption, Numerical analysis

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Proceedings Article | 16 August 2017 Open Access

New approaches in teaching laser engineering classes: modeling and building up a laser

Ilya Alexeev, Christoph Pflaum, Michael Schmidt

Proceedings Volume 10452, 104520B (2017) https://doi.org/10.1117/12.2264777

KEYWORDS: Laser engineering, Laser development, Solid state lasers, Laser systems engineering, Optical simulations

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SPIE Journal Paper | 27 May 2016

Fourier transform based interface roughness analysis for flexible thin-film silicon solar cells

Birhanu Tamene Abebe, Stefan Geißendörfer, Christoph Pflaum

JPE, Vol. 6, Issue 02, 025505, (May 2016) https://doi.org/10.1117/12.10.1117/1.JPE.6.025505

KEYWORDS: Interfaces, Solar cells, Fourier transforms, Computer simulations, Absorption, Thin film solar cells, Atomic force microscopy, Silicon solar cells, Thin films, External quantum efficiency

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Proceedings Article | 16 March 2016 Paper

Modeling and simulation of ultra-short pulse amplification

Christoph Pflaum, Rainer Hartmann, Zhabiz Rahimi

Proceedings Volume 9726, 972610 (2016) https://doi.org/10.1117/12.2211784

KEYWORDS: Amplifiers, Ultrafast phenomena, Laser crystals, Modeling and simulation, Numerical simulations, Resonators, Diodes, Semiconductor lasers, Pulsed laser operation, Laser resonators, Photons, Dispersion, Crystals, Optical amplifiers, Optical simulations, Data modeling, Computer simulations, Laser beam propagation

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Proceedings Article | 8 October 2015 Open Access

Simulation of solid state lasers and amplifiers

Christoph Pflaum, Zhabiz Rahimi

Proceedings Volume 9793, 97930D (2015) https://doi.org/10.1117/12.2223064

KEYWORDS: Optical simulations, Laser crystals, Crystals, Optical amplifiers, Solid state lasers, Laser resonators, Resonators, Beam shaping, Beam propagation method, Doping

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Proceedings Article | 3 March 2015 Paper

Analysis of thermal depolarization compensation using full vectorial beam propagation method in laser amplifiers

Rainer Hartmann, Christoph Pflaum, Thomas Graupeter

Proceedings Volume 9343, 93431I (2015) https://doi.org/10.1117/12.2077990

KEYWORDS: Crystals, Birefringence, Polarization, Optical simulations, Laser amplifiers, Beam propagation method, Finite element methods, Refractive index, Laser crystals, Thermal effects

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Proceedings Article | 1 May 2014 Paper

Analysis of birefringence effects in laser crystals by full vectorial beam propagation method

Rainer Hartmann, Christoph Pflaum, Thomas Graupeter

Proceedings Volume 9131, 91310K (2014) https://doi.org/10.1117/12.2051594

KEYWORDS: Refractive index, Beam propagation method, Birefringence, Optical simulations, Electroluminescent displays, Refraction, Laser crystals, Polarization, Laser beam propagation, 3D modeling

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Modern laser technology demands powerful numerical tools to predict the efficiency of laser configurations. Birefringence has a strong influence on the beam quality and output power of a laser amplifier. We developed a complex physical model for simulating laser amplifiers and analyzing the birefringence effects. This model includes pump configuration, thermal lensing effects, birefringence, and beam propagation in the laser amplifier. The pump configuration is simulated using a complete three-dimensional ray tracing or by an approximation based on super-Gaussian functions. For an accurate modeling of the thermal lensing effect, the deformation of the end faces and the polarization dependent index of refraction was taken into account. Temperature, deformation and stress inside the laser crystal were calculated by a three-dimensional finite element analysis (FEA). In particular, the refractive index was accurately calculated by considering its temperature dependency and the photo elastic effect. This refractive index was used in the simulation of laser beam propagation through an amplifier. These simulations were performed by a complete three-dimensional vectorial beam propagation method (VBPM). The advantage of VBPM is that it can be applied to a polarization dependent index of refraction. This is important when taking into account the birefringence obtained by the photo elastic effect inside the laser crystal. The beam propagation method is based on finite elements on block structured grids as well as a Crank-Nicolson approximation in the propagation direction (FE-BPM). Reflecting boundaries were eliminated by introducing a perfect matching layer (PML). Simulation results show that a complete three-dimensional simulation model was useful in analyzing and optimizing high power laser amplifiers. The value of our model lies in the fact that it can take into account the crystal cut direction. Based on this the birefringence for simulating the laser beam quality and output power can be calculated.

Proceedings Article | 1 May 2014 Paper

Characterisation of birefringence of [111]-cut crystal rod using side-pumping and crystal rotation

Thomas Graupeter, Rainer Hartmann, Christoph Pflaum

Proceedings Volume 9135, 91351L (2014) https://doi.org/10.1117/12.2052268

KEYWORDS: Crystals, Polarization, Birefringence, Laser crystals, Photoelasticity, Resonators, Electroluminescent displays, Optical pumping, Rod lasers, Nd:YAG lasers

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Proceedings Article | 7 March 2014 Paper

Simulation of the scattering effect of randomly textured surfaces on the efficiency of thin film tandem solar cell

Zhabiz Rahimi, Christoph Pflaum

Proceedings Volume 8981, 89811E (2014) https://doi.org/10.1117/12.2035319

KEYWORDS: Solar cells, Light scattering, External quantum efficiency, Scattering, Surface roughness, Tandem solar cells, Atomic force microscopy, Silver, Transparent conductors, Computer simulations

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Proceedings Article | 28 February 2014 Paper

Simulation of birefringence in laser crystals

Thomas Graupeter, Christoph Pflaum

Proceedings Volume 8959, 89591S (2014) https://doi.org/10.1117/12.2037321

KEYWORDS: Birefringence, Crystals, Laser crystals, Nd:YAG lasers, Photoelasticity, Optical simulations, Refractive index, Absorption, Rod lasers, Solid state lasers

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Proceedings Article | 28 February 2014 Paper

Optical path difference of slanted edge diode-pumped Yb:YAG/YAG thin-disk laser

Hamed Aminpour, Christoph Pflaum

Proceedings Volume 8959, 89591V (2014) https://doi.org/10.1117/12.2034282

KEYWORDS: Crystals, Laser crystals, Monte Carlo methods, Absorption, Disk lasers, Optical simulations, YAG lasers, Ray tracing, Finite element methods, Resonators

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Proceedings Article | 19 September 2013 Paper

Modelling and comparison of light trapping caused by textured interfaces and nanoparticles in thin film solar cells

Birhanu Tamene Abebe, Kai Hertel, Christoph Pflaum

Proceedings Volume 8818, 88180Q (2013) https://doi.org/10.1117/12.2022868

KEYWORDS: Particles, Atomic force microscopy, Interfaces, Solar cells, Absorption, Transparent conductors, Silver, Nanoparticles, Maxwell's equations, Computer simulations

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Proceedings Article | 6 March 2013 Paper

Simulation of solid-state lasers with composites and ceramic crystals

Zhabiz Rahimi, Christoph Pflaum

Proceedings Volume 8599, 85990Y (2013) https://doi.org/10.1117/12.2004076

KEYWORDS: Crystals, Doping, Laser crystals, Ceramics, Nd:YAG lasers, Thermal effects, Optical simulations, Absorption, Laser resonators, Ray tracing

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Proceedings Article | 22 February 2013 Paper

Modeling of semiconductor saturable absorber mirrors using dynamic mode analysis

Christoph Pflaum, Zhabiz Rahimi

Proceedings Volume 8600, 86000V (2013) https://doi.org/10.1117/12.2004005

KEYWORDS: Mirrors, Laser crystals, Semiconductors, Optical simulations, Crystals, Thermal effects, Semiconductor lasers, Pulsed laser operation, Laser resonators, Doping

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Proceedings Article | 16 May 2012 Paper

Dynamic multimode analysis (DMA) of passively Q-switched intracavity frequency-doubling solid state laser

Fan Feng, Christoph Pflaum

Proceedings Volume 8434, 843404 (2012) https://doi.org/10.1117/12.921852

KEYWORDS: Second-harmonic generation, Q switched lasers, Solid state lasers, Frequency doubling crystals, Computer simulations, Crystals, Resonators, Laser resonators, Refractive index, Nonlinear crystals

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Proceedings Article | 16 May 2012 Paper

Stability analysis of solid-state lasers regarding thermal lensing effect

Thomas Graupeter, Christoph Pflaum

Proceedings Volume 8433, 843321 (2012) https://doi.org/10.1117/12.923475

KEYWORDS: Refractive index, Thermal effects, Dielectric polarization, Laser crystals, Polarization, Crystals, Solid state lasers, Photoelasticity, Laser resonators, Electro optics

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Proceedings Article | 2 May 2012 Paper

Simulation of optical properties of percolation type electrode for thin film solar cells with silver nanowires

Shuai Yan, Johannes Krantz, Christoph Pflaum, Christoph Brabec

Proceedings Volume 8438, 84381N (2012) https://doi.org/10.1117/12.922000

KEYWORDS: Silver, Transmittance, Electrodes, Optical simulations, Computer simulations, Optical properties, Thin film solar cells, Maxwell's equations, Finite-difference time-domain method, Nanowires

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Proceedings Article | 2 May 2012 Paper

Simulation of light-trapping in thin film solar cells by high performance computing

Christoph Pflaum, Christine Jandl

Proceedings Volume 8438, 84380D (2012) https://doi.org/10.1117/12.922515

KEYWORDS: Thin film solar cells, Computer simulations, Silver, Quantum efficiency, Absorption, Transparent conductors, Plasmonics, Maxwell's equations, Reflection, Solar cells

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Proceedings Article | 7 February 2012 Paper

Dynamic multi-mode analysis of passive Q-switched lasers

Christoph Pflaum, Zhabiz Rahimi, Fan Feng

Proceedings Volume 8236, 823612 (2012) https://doi.org/10.1117/12.905201

KEYWORDS: Q switched lasers, Photons, Optical simulations, Laser resonators, Q switches, Resonators, Numerical simulations, Ions, Absorption, Laser development

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Proceedings Article | 20 April 2011 Paper

Simulation of silicon thin-film solar cells for oblique incident waves

Christine Jandl, Kai Hertel, Christoph Pflaum, Helmut Stiebig

Proceedings Volume 8065, 806505 (2011) https://doi.org/10.1117/12.882860

KEYWORDS: Solar cells, Atomic force microscopy, Quantum efficiency, Thin film solar cells, Transparent conductors, Polarization, Silicon films, Data modeling, Interfaces, Computer simulations

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Proceedings Article | 8 February 2011 Paper

Analysis of frequency dependent pump light absorption

Matthias Wohlmuth, Christoph Pflaum

Proceedings Volume 7913, 791303 (2011) https://doi.org/10.1117/12.874793

KEYWORDS: Absorption, Crystals, Resonators, Laser crystals, Diodes, Optical simulations, Nd:YAG lasers, Thermal modeling, Finite element methods, Diode pumped solid state lasers

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Proceedings Article | 18 May 2010 Paper

Simulation of tandem thin-film silicon solar cells

Christine Jandl, Wilma Dewald, Ulrich Paetzold, Aad Gordijn, Christoph Pflaum, Helmut Stiebig

Proceedings Volume 7725, 772516 (2010) https://doi.org/10.1117/12.854366

KEYWORDS: Quantum efficiency, Solar cells, Thin film solar cells, Computer simulations, Atomic force microscopy, Transparent conductors, Silicon solar cells, Tandem solar cells, Thin films, Interfaces

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Proceedings Article | 15 May 2010 Paper

Rigorous EMF simulation of absorber shape variations and their impact on lithographic processes

Z. Rahimi, A. Erdmann, P. Evanschitzky, C. Pflaum

Proceedings Volume 7545, 75450C (2010) https://doi.org/10.1117/12.863595

KEYWORDS: Photomasks, Diffraction, Computer simulations, Finite-difference time-domain method, Lithography, Near field, Interfaces, Critical dimension metrology, Maxwell's equations, Semiconducting wafers

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Proceedings Article | 5 May 2010 Paper

Characterization of the scattering effect of complex mask geometries with surface roughness

Z. Rahimi, A. Erdmann, C. Pflaum

Proceedings Volume 7717, 771709 (2010) https://doi.org/10.1117/12.853726

KEYWORDS: Photomasks, Diffraction, Surface roughness, Near field, Computer simulations, Finite-difference time-domain method, Critical dimension metrology, Etching, Maxwell's equations, Light scattering

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Proceedings Article | 17 February 2010 Paper

Dynamic 3D modeling of solid state laser resonators using a coupled thermo-optical finite element analysis

Matthias Wohlmuth, Konrad Altmann, J. Werner, Christoph Pflaum

Proceedings Volume 7578, 75782H (2010) https://doi.org/10.1117/12.841930

KEYWORDS: Crystals, Resonators, Finite element methods, Thermal modeling, Pulsed laser operation, Optical simulations, Thermography, 3D modeling, Solid state lasers, Absorption

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Proceedings Article | 24 February 2009 Paper

Time-dynamic simulations of DFB lasers in 2D

Britta Heubeck, Christoph Pflaum

Proceedings Volume 7211, 721116 (2009) https://doi.org/10.1117/12.809017

KEYWORDS: Optical simulations, Semiconductor lasers, Laser resonators, Chemical elements, Resonators, Computer simulations, Wave propagation, Optical components, Refractive index, Radio propagation

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Proceedings Article | 19 February 2009 Paper

Finite element simulation of solid state laser resonators

Matthias Wohlmuth, Konrad Altmann, Christoph Pflaum

Proceedings Volume 7194, 71940L (2009) https://doi.org/10.1117/12.808121

KEYWORDS: Interfaces, Resonators, Crystals, Laser resonators, Optical simulations, Mirrors, Solid state lasers, Computer simulations, Finite element methods, Chemical elements

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Proceedings Article | 8 May 2008 Paper

A new simulation technique for DFB lasers

Britta Heubeck, Christoph Pflaum

Proceedings Volume 6997, 69970A (2008) https://doi.org/10.1117/12.779290

KEYWORDS: Semiconductor lasers, Optical simulations, Laser resonators, Resonators, Computer simulations, Wave propagation, Chemical elements, Electromagnetic radiation, Radio propagation, Refractive index

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Proceedings Article | 16 April 2008 Paper

3-dimensional simulation of solid state lasers

Matthias Wohlmuth, Christoph Pflaum

Proceedings Volume 6998, 69980I (2008) https://doi.org/10.1117/12.779515

KEYWORDS: Resonators, Q switching, Crystals, Optical simulations, Thermal effects, Q switched lasers, Solid state lasers, Mirrors, Beam shaping, Computer simulations

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Proceedings Article | 14 February 2008 Paper

3-dimensional simulation of the solid state lasers

Christoph Pflaum, Matthias Wohlmuth

Proceedings Volume 6871, 687106 (2008) https://doi.org/10.1117/12.761219

KEYWORDS: Diffusion, Q switched lasers, Resonators, Optical simulations, Solid state lasers, Laser resonators, Mirrors, Crystals, Laser crystals, Q switches

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Proceedings Article | 17 April 2006 Paper

Numerical simulation of multiple modes in solid state lasers

Britta Heubeck, Christoph Pflaum

Proceedings Volume 6190, 61900X (2006) https://doi.org/10.1117/12.661514

KEYWORDS: Optical simulations, Solid state lasers, Laser resonators, Numerical simulations, Ordinary differential equations, Transmission electron microscopy, Lawrencium, Resonators, Beam propagation method, Mirrors

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Proceedings Article | 27 April 2005 Paper

High-resolution absolute temperature mapping of laser crystals in diode-end-pumped configuration

Julien Didierjean, Sebastien Forget, Sebastien Chenais, Frederic Druon, Francois Balembois, Patrick Georges, Konrad Altmann, Christoph Pflaum

Proceedings Volume 5707, (2005) https://doi.org/10.1117/12.593895

KEYWORDS: Crystals, Laser crystals, Temperature metrology, Calibration, Cameras, Infrared cameras, Nd:YAG lasers, Finite element methods, Copper, Indium

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Proceedings Article | 1 September 2004 Paper

Modeling and computation of laser cavity eigenmodes

Konrad Altmann, Christoph Pflaum, David Seider

Proceedings Volume 5460, (2004) https://doi.org/10.1117/12.544778

KEYWORDS: Laser resonators, Chemical elements, 3D modeling, Mathematical modeling, Chlorine, Lithium, Absorption, Paraxial approximations, Beam propagation method, Mirrors

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Proceedings Article | 1 June 2004 Paper

Three-dimensional computation of laser cavity eigenmodes by the use of finite element analysis (FEA)

Konrad Altmann, Christoph Pflaum, David Seider

Proceedings Volume 5333, (2004) https://doi.org/10.1117/12.532578

KEYWORDS: Finite element methods, Mirrors, Wave propagation, Laser resonators, Resonators, Refractive index, Radio propagation, Crystals, Beam propagation method, Phase shifts

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Showing 5 of 41 publications

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