Dr. Luke A. Emmert Profile

Dr. Luke A. Emmert

at Univ of New Mexico

SPIE Involvement:

Author

Publications (36)

SPIE Journal Paper | 23 April 2022 Open Access

Damage threshold affected by the spatiotemporal evolution of femtosecond laser pulses in multilayer structures

Amir Khabbazi Oskouei, Matthias Lenzner, Luke Emmert, Marco Jupé, Thomas Willemsen, Morten Steinecke, Detlev Ristau, Wolfgang Rudolph

OE, Vol. 61, Issue 07, 071602, (April 2022) https://doi.org/10.1117/12.10.1117/1.OE.61.7.071602

KEYWORDS: Mirrors, Femtosecond phenomena, Multilayers, Laser induced damage, Laser damage threshold, Finite element methods, Optical engineering, Optical coatings, Silica, Reflectivity

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Proceedings Article | 19 November 2021 Presentation + Paper

Spatio-temporal evolution of femtosecond laser pulses in dielectric multi-layers controlling the damage behavior

Matthias Lenzner, Amir Khabbazi Oskouei, Luke Emmert, Marco Jupé, Thomas Willemsen, Morten Steinecke, Detlev Ristau, Wolfgang Rudolph

Proceedings Volume 11910, 1191012 (2021) https://doi.org/10.1117/12.2600528

KEYWORDS: Mirrors, Femtosecond phenomena, Dielectrics, Reflectivity, Laser induced damage, Laser damage threshold, Oxides, Fourier transforms, Superposition

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SPIE Journal Paper | 10 November 2021

Laser-driven detonation wave in a dielectric film prior to ablation

David Dunlap, Yejia Xu, Luke Emmert, Wolfgang Rudolph

OE, Vol. 61, Issue 02, 021002, (November 2021) https://doi.org/10.1117/12.10.1117/1.OE.61.2.021002

KEYWORDS: Plasma, Laser ablation, Hybrid fiber optics, Dielectrics, Wave propagation, Hafnium, Optical engineering, Thin films, Absorption, Combustion

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Proceedings Article | 20 November 2019 Presentation + Paper

Third harmonic (TH) generation: a tool to study dielectric material properties near the laser induced damage threshold (LIDT)

Amir Khabbazi Oskouei, Luke Emmert, Morten Steinecke, Marco Jupé, Detlev Ristau, Lars Jensen, Wolfgang Rudolph

Proceedings Volume 11173, 111731L (2019) https://doi.org/10.1117/12.2536440

KEYWORDS: Dielectrics, Absorption, Laser damage threshold, Refractive index, Plasma, Laser induced damage, Electrons, Kerr effect, Optical filters, Mirrors

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Proceedings Article | 16 November 2018 Paper

Femtosecond laser-induced modifications of frequency tripling mirrors

Amir Khabbazi Oskouei, Sebastian Baur, Luke Emmert, Marco Jupe, Thomas Willemsen, Morten Steinecke, Lars Jensen, Detlev Ristau, Wolfgang Rudolph

Proceedings Volume 10805, 108051W (2018) https://doi.org/10.1117/12.2500675

KEYWORDS: Absorption, Mirrors, Reflection, Temperature metrology, Femtosecond phenomena, Refractive index, Dielectrics, Third-harmonic generation, Silica, Thin films

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Proceedings Article | 16 November 2018 Paper

Study of the role of the interface on the defect density in HfO2 films using STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage)

Luke Emmert, Sebastian Töpfer, Thomas Willemsen, Marco Jupé, Detlev Ristau, Wolfgang Rudolph

Proceedings Volume 10805, 108052H (2018) https://doi.org/10.1117/12.2500291

KEYWORDS: Interfaces, Laser induced damage, Hybrid fiber optics, Silica, Laser optics, Multilayers, Ion beams, Sputter deposition, Laser damage threshold, Absorption

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Proceedings Article | 13 November 2017 Paper

Characterization of 1-on-1 damage in high reflectors using the spatially-temporally resolved optical laser-induced damage (STEREO-LID) technique

Luke Emmert, Yejia Xu, Travis Day, Carmen Menoni, Wolfgang Rudolph

Proceedings Volume 10447, 104471F (2017) https://doi.org/10.1117/12.2280846

KEYWORDS: Mirrors, Reflectors, Laser induced damage, Reflection, Laser optics, Light scattering, Laser damage threshold, Plasma, Signal detection

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SPIE Journal Paper | 12 October 2016

Comparison of defects responsible for nanosecond laser-induced damage and ablation in common high index optical coatings

Yejia Xu, Mohammed Abdulameer, Luke Emmert, Travis Day, Dinesh Patel, Carmen Menoni, Wolfgang Rudolph

OE, Vol. 56, Issue 01, 011019, (October 2016) https://doi.org/10.1117/12.10.1117/1.OE.56.1.011019

KEYWORDS: Laser optics, Laser induced damage, Optical coatings, Laser ablation, Hybrid fiber optics, Laser damage threshold, Absorption, Tantalum, Optical engineering, Microscopes

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Proceedings Article | 23 November 2015 Paper

Comparative STEREO-LID (Spatio-TEmporally REsolved Optical Laser-Induced Damage) studies of critical defect distributions in IBS, ALD, and electron-beam coated dielectric films

Yejia Xu, Amir Khabbazi, Travis Day, Andrew Brown, Luke Emmert, Joseph Talghader, Ella Field, Damon Kletecka, John Bellum, Dinesh Patel, Carmen Menoni, Wolfgang Rudolph

Proceedings Volume 9632, 963215 (2015) https://doi.org/10.1117/12.2196548

KEYWORDS: Laser induced damage, Laser optics, Optical coatings, Probability theory, Atomic layer deposition, Dielectrics, Laser damage threshold, Coating, Ion beams, Sputter deposition, Deposition processes, Electron beams

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Proceedings Article | 23 November 2015 Paper

Optical coatings excited by femtosecond lasers near the damage threshold: challenges and opportunities

Luke Emmert, Cristina Rodriguez, Zhanliang Sun, Farzin Beygi Azar Aghbolagh, Stefan Günster, Detlev Ristau, Dinesh Patel, Carmen Menoni, Wolfgang Rudolph

Proceedings Volume 9632, 96320K (2015) https://doi.org/10.1117/12.2196553

KEYWORDS: Optical coatings, Femtosecond phenomena, Laser induced damage, Dielectrics, Third-harmonic generation, Dielectric filters, Laser damage threshold, Ultrafast phenomena, Mirrors, Polarizers, Coating, Absorption, Pulsed laser operation, Picosecond phenomena

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Proceedings Article | 2 December 2014 Paper

Modification of multilayer mirror top-layer design for increased laser damage resistance

D. Schiltz, D. Patel, L. Emmert, C. Baumgarten, B. Reagan, W. Rudolph, J. Rocca, C. Menoni

Proceedings Volume 9237, 92371G (2014) https://doi.org/10.1117/12.2068244

KEYWORDS: Coating, Silica, Laser induced damage, Multilayers, Absorption, Resistance, Laser damage threshold, Reflectors, Mirrors, Interfaces

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Proceedings Article | 19 November 2013 Paper

Improvements in the laser damage behavior of Ta2O5/SiO2 interference coatings by modification of the top layer design

D. Patel, D. Schiltz, P. Langton, L. Emmert, L. Acquaroli, C. Baumgarten, B. Reagan, J. Rocca, W. Rudolph, A. Markosyan, R. Route, M. Fejer, C. Menoni

Proceedings Volume 8885, 888522 (2013) https://doi.org/10.1117/12.2030380

KEYWORDS: Laser induced damage, Reflectors, Silica, Scattering, Multilayers, Picosecond phenomena, Absorption, Surface roughness, Ion beams, Sputter deposition

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Proceedings Article | 14 November 2013 Paper

Confocal photothermal microscopy of thin films based on etalon and thermal lensing effects

Z. Sun, A. Mansoori, X. Zhang, L. Emmert, D. Patel, C. Menoni, W. Rudolph

Proceedings Volume 8885, 88851Y (2013) https://doi.org/10.1117/12.2029955

KEYWORDS: Absorption, Microscopes, Confocal microscopy, Fabry–Perot interferometers, Laser beam diagnostics, Thermal effects, Reflectivity, Signal detection, Thin films, Signal to noise ratio

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Proceedings Article | 14 November 2013 Paper

Laser damage in dielectric films: What we know and what we don't

Wolfgang Rudolph, Luke Emmert, Zhanliang Sun, Dinesh Patel, Carmen Menoni

Proceedings Volume 8885, 888516 (2013) https://doi.org/10.1117/12.2030894

KEYWORDS: Absorption, Laser induced damage, Electrons, Thin films, Continuous wave operation, Microscopy, Scattering, Optical coatings, Silica, Ionization

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Proceedings Article | 9 July 2013 Paper

Femtosecond to nanosecond laser damage in dielectric materials

W. Rudolph, L. Emmert, C. Rodriguez, Z. Sun, X. Zhang, Y. Xu, C. Menoni, P. Langston, E. Krous, D. Patel

Proceedings Volume 8786, 878602 (2013) https://doi.org/10.1117/12.2020356

KEYWORDS: Absorption, Dielectrics, Femtosecond phenomena, Laser induced damage, Microscopy, Scattering, Annealing, Particles, Thin films, Reflection

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Proceedings Article | 4 December 2012 Paper

Ion beam sputtered Y2O3

D. Patel, P. Langston, L. Imbler, L. Emmert, A. Markosyan, R. Route, M. Fejer, W. Rudolph, C. Menoni

Proceedings Volume 8530, 85300Z (2012) https://doi.org/10.1117/12.976808

KEYWORDS: Ion beams, Absorption, Laser induced damage, Sputter deposition, Argon, Surface roughness, Oxygen, Silica, Optical coatings, Optical properties

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Proceedings Article | 4 December 2012 Paper

What role do defects play in the laser damage behavior of metal oxides?

C. Menoni, P. Langston, E. Krous, D. Patel, L. Emmert, A. Markosyan, B. Reagan, K. Wernsing, Y. Xu, Z. Sun, R. Route, M. Fejer, J. Rocca, W. Rudolph

Proceedings Volume 8530, 85300J (2012) https://doi.org/10.1117/12.981732

KEYWORDS: Oxygen, Absorption, Laser induced damage, Picosecond phenomena, Metals, Oxides, Thin films, Sputter deposition, Ion beams, Silica

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SPIE Journal Paper | 9 July 2012

Third harmonic microscopy of intrinsic and induced material anisotropy in dielectric thin films

Reed Weber, Cristina Rodriguez, Duy Nguyen, Luke Emmert, Wolfgang Rudolph, Dinesh Patel, Carmen Menoni

OE, Vol. 51, Issue 12, 121807, (July 2012) https://doi.org/10.1117/12.10.1117/1.OE.51.12.121807

KEYWORDS: Anisotropy, Microscopy, Thin films, Nanoparticles, Silica, Gold, Polarization, Signal to noise ratio, Dielectrics, Polarized microscopy

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Proceedings Article | 12 January 2012 Paper

Subpicosecond laser breakdown in optical thin films

W. Rudolph, L. Emmert, D. Nguyen, C. Karras, Z. Sun, R. Weber

Proceedings Volume 8206, 82060D (2012) https://doi.org/10.1117/12.911285

KEYWORDS: Dielectrics, Electrons, Laser damage threshold, Pulsed laser operation, Ionization, Laser optics, Laser induced damage, Thin films, Femtosecond phenomena, Absorption

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Proceedings Article | 28 November 2011 Paper

The impact ionization coefficient in dielectric materials revisited

C. Karras, Z. Sun, D. Nguyen, L. Emmert, W. Rudolph

Proceedings Volume 8190, 819028 (2011) https://doi.org/10.1117/12.899267

KEYWORDS: Ionization, Ultraviolet radiation, Absorption, Sapphire, Dielectrics, Data modeling, Silica, Picosecond phenomena, Multiphoton processes, Artificial intelligence

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Proceedings Article | 23 November 2011 Paper

Third harmonic microscopy for optical material characterization

R. Weber, C. Rodriguez, D. Nguyen, L. Emmert, W. Rudolph, D. Patel, C. Menoni

Proceedings Volume 8190, 81900V (2011) https://doi.org/10.1117/12.899265

KEYWORDS: Anisotropy, Microscopy, Silica, Nanoparticles, Interfaces, Gold, Optical materials characterization, Optical microscopy, Polarization, Laser induced damage

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Proceedings Article | 6 December 2010 Paper

Advances in ion beam sputtered Sc2O3 for optical interference coatings

Carmen Menoni, Erik Krous, Dinesh Patel, Peter Langston, Jonathan Tollerud, Duy Nguyen, Luke Emmert, Ashot Markosyan, Roger Route, Martin Fejer, Wolfgang Rudolph

Proceedings Volume 7842, 784202 (2010) https://doi.org/10.1117/12.855604

KEYWORDS: Laser induced damage, Ion beams, Sputter deposition, Oxygen, Scandium, Picosecond phenomena, Refractive index, Atomic force microscopy, Argon, Optical coatings

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Proceedings Article | 2 December 2010 Paper

The vacuum effect of femtosecond LIDT measurements on dielectric films

D. Nguyen, L. Emmert, W. Rudolph, D. Patel, C. Menoni

Proceedings Volume 7842, 78420V (2010) https://doi.org/10.1117/12.867996

KEYWORDS: Oxygen, Silica, Dielectrics, Femtosecond phenomena, Atomic layer deposition, Atmospheric optics, Nitrogen, Laser damage threshold, Ionization, Electrons

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Proceedings Article | 2 December 2010 Paper

Calculation and measurement of fs-LIDT of TixSi(1-x)O2-mixtures

M. Jupé, L. Jensen, M. Mende, D. Ristau, A. Melninkaitis, V. Sirutkaitis, D. Nguyen, L. Emmert, W. Rudolph

Proceedings Volume 7842, 78420Z (2010) https://doi.org/10.1117/12.867736

KEYWORDS: Electrons, Ionization, Silica, Absorption, Dielectrics, Pulsed laser operation, Coating, Oxides, Laser induced damage, Titanium dioxide

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Proceedings Article | 1 December 2010 Paper

Investigations on SiO2/HfO2 mixtures for nanosecond and femtosecond pulses

Lars Jensen, Mathias Mende, Holger Blaschke, Detlev Ristau, Duy Nguyen, Luke Emmert, Wolfgang Rudolph

Proceedings Volume 7842, 784207 (2010) https://doi.org/10.1117/12.867238

KEYWORDS: Composites, Laser damage threshold, Laser induced damage, Silica, Femtosecond phenomena, Optical coatings, Reflectors, Refraction, Absorption, Mirrors

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Proceedings Article | 29 November 2010 Paper

Femtosecond pulse S on 1 LIDT in dielectric materials: comparison of experiment and theory

L. Emmert, M. Mero, D. Nguyen, W. Rudolph, D. Patel, E. Krous, C. Menoni

Proceedings Volume 7842, 784211 (2010) https://doi.org/10.1117/12.868035

KEYWORDS: Ionization, Dielectrics, Laser damage threshold, Pulsed laser operation, Picosecond phenomena, Femtosecond phenomena, Absorption, Dielectric breakdown, Laser induced damage, Oxides

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Proceedings Article | 31 December 2009 Paper

Optimization of scandia thin films for high power laser coating applications

Erik Krous, Dinesh Patel, Ashot Markosyan, Duy Nguyen, Luke Emmert, Peter Langston, Roger Route, Martin Fejer, Wolfgang Rudolph, Michelle Shinn, Carmen Menoni

Proceedings Volume 7504, 750407 (2009) https://doi.org/10.1117/12.836915

KEYWORDS: Laser damage threshold, Oxygen, Coating, Ion beams, Refractive index, Absorption, Thin films, Sputter deposition, Thin film coatings, High power lasers

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Proceedings Article | 31 December 2009 Paper

Fundamental processes controlling the single and multiple femtosecond pulse damage behavior of dielectric oxide films

L. Emmert, D. Nguyen, M. Mero, W. Rudolph, D. Ristau, K. Starke, M. Jupé, C. Menoni, D. Patel, E. Krous

Proceedings Volume 7504, 75040P (2009) https://doi.org/10.1117/12.836508

KEYWORDS: Electrons, Ionization, Laser damage threshold, Oxides, Dielectrics, Laser induced damage, Absorption, Femtosecond phenomena, Pulsed laser operation, Picosecond phenomena

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Proceedings Article | 31 December 2009 Paper

The effect of nitrogen doping on the multiple-pulse subpicosecond dielectric breakdown of hafnia films

D. Nguyen, L. Emmert, W. Rudolph, D. Patel, E. Krous, C. Menoni

Proceedings Volume 7504, 750402 (2009) https://doi.org/10.1117/12.836504

KEYWORDS: Nitrogen, Laser damage threshold, Oxides, Hafnium, Doping, Electrons, Dielectric breakdown, Oxygen, Ions, Ionization

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Proceedings Article | 31 December 2009 Paper

Studies of femtosecond laser induced damage of HfO2 thin film in atmospheric and vacuum environments

D. Nguyen, L. Emmert, W. Rudolph, D. Patel, E. Krous, C. Menoni, M. Shinn

Proceedings Volume 7504, 750403 (2009) https://doi.org/10.1117/12.836505

KEYWORDS: Silica, Nitrogen, Femtosecond phenomena, Thin films, Laser damage threshold, Ionization, Free electron lasers, Dielectrics, Coating, Atmospheric optics

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Proceedings Article | 30 December 2008 Paper

The effect of annealing on the subpicosecond breakdown behavior of hafnia films

Duy Nguyen, Luke Emmert, Mark Mero, Wolfgang Rudolph, Dinesh Patel, Eric Krous, Carmen Menoni

Proceedings Volume 7132, 71320N (2008) https://doi.org/10.1117/12.804452

KEYWORDS: Annealing, Laser damage threshold, Absorption, Picosecond phenomena, Laser induced damage, Silica, Dielectrics, Optical coatings, High power lasers, Femtosecond phenomena

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Proceedings Article | 30 December 2008 Paper

The role of native and photoinduced defects in the multi-pulse subpicosecond damage behavior of oxide films

Mark Mero, Luke Emmert, Wolfgang Rudolph

Proceedings Volume 7132, 713209 (2008) https://doi.org/10.1117/12.804430

KEYWORDS: Laser damage threshold, Absorption, Neodymium, Technetium, Oxides, Ionization, Picosecond phenomena, Pulsed laser operation, Annealing, Dielectrics

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Proceedings Article | 14 May 2008 Paper

Subpicosecond dielectric breakdown and incubation in TixSi1-xO2 composite films with adjustable bandgap

L. Emmert, D. Nguyen, I. Cravetchi, M. Mero, W. Rudolph, M. Jupe, M. Lappschies, K. Starke, D. Ristau

Proceedings Volume 7005, 70051V (2008) https://doi.org/10.1117/12.785154

KEYWORDS: Laser damage threshold, Composites, Oxides, Coating, Absorption, Refractive index, Dielectric breakdown, Ion beams, Laser induced damage, Femtosecond phenomena

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Proceedings Article | 21 February 2008 Paper

A method for comparison of computational fluid dynamic simulation and planar laser induced fluorescence images for a supersonic flowfield

Timothy Madden, Carrie Noren, Luke Emmert, Michael Heaven

Proceedings Volume 6874, 687406 (2008) https://doi.org/10.1117/12.773772

KEYWORDS: Luminescence, Laser induced fluorescence, Computer simulations, Diagnostics, Oxygen, Data modeling, Pulsed laser operation, 3D modeling, Computational fluid dynamics, CCD cameras

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Non-intrusive diagnostics, such as planar laser induced fluorescence (PLIF) provide an excellent means to interrogate flowfields with minimal perturbation to the thermodynamic state of the gas. In the case of PLIF, the diagnostic can provide multidimensional information regarding the spread of a tracer, such as I₂, providing an excellent means for quantifying mixing between multiple streams of gases. The images obtained using PLIF can in turn be used to compare directly to images generated by computational fluid dynamic (CFD) simulations for the experiment, providing an excellent mechanism to compare CFD to experiment. An issue that exists with interpreting PLIF images from compressible flows is that the local density and temperature of the I₂ varies throughout the field of imaging, leading to variations in the rate of fluorescence and the rate of quenching of the excited state of I₂. These variations lead to local changes in the number of photons generated during the course of the laser pulse that excites the I₂, beyond the variation due to the varying density of I₂. Thus, when comparing PLIF images for compressible flows with CFD simulation data, some effort should be made to ensure that the CFD image reflects the local variations in photon production that occur in compressible flows. A method is presented here where a CFD simulation data for a compressible PLIF experiment is used to predict the local photon production during the course of interrogating laser pulse. The experiment consists of a chemical oxygen-iodine laser mixing nozzle utilizing Mach 3 injection of a He/I₂ mixture into a Mach 2.5 crossflow with a mixture of He and O₂ and has strong compressibility. The method utilizes numerical solutions for the ordinary differential equations describing the state-to-state processes within the I₂ fluorescence process where I₂(X) is pumped to the I₂(B), fluoresces and is quenched. These equations are solved locally within the flowfield predicted by the CFD simulation to predict the variations within the photon production, and compare directly with PLIF images from the experiment.

Proceedings Article | 18 December 2007 Paper

Experimental and theoretical studies of subpicosecond laser damage in TixSi1-xO2 composite films

D. Nguyen, I. Cravetchi, L. Emmert, W. Rudolph, M. Jupe, M. Lappschies, K. Starke, D. Ristau

Proceedings Volume 6720, 67200C (2007) https://doi.org/10.1117/12.753547

KEYWORDS: Composites, Laser induced damage, Oxides, Silicon, Laser damage threshold, Refractive index, Dielectrics, Coating, Absorption, Sputter deposition

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Proceedings Article | 30 January 2004 Paper

Novel photomechanical actuators

Joseph Ritter, James Brozik, Luke Emmert, Mike Fallbach, Rodney Bradford, Donald Leo, Ken Meissner

Proceedings Volume 5166, (2004) https://doi.org/10.1117/12.512022

KEYWORDS: Active optics, Mirrors, Polymers, Control systems, Wavefronts, Space telescopes, Imaging spectroscopy, Actuators, Optical components, Radio optics

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Showing 5 of 36 publications

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