Dr. Thomas C. Hasenberg Profile

Dr. Thomas C. Hasenberg

Senior Director R&D

SPIE Involvement:

Conference Program Committee | Author

Publications (25)

Proceedings Article | 7 February 2023 Presentation

Effects of laser pulse profiles on bubble dynamics

Steven Peng, Aditi Ray, Jian James Zhang, Thomas Hasenberg, Mike O'Brien, Hyun Wook Kang

Proceedings Volume PC11958, PC119580H (2023) https://doi.org/10.1117/12.2610040

KEYWORDS: Pulsed laser operation, Fiber lasers, Prototyping, Numerical simulations, Laser therapeutics, Laser systems engineering, Laser lithotripsy, Laser irradiation, Laser development, Laser ablation

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Proceedings Article | 9 March 2021 Presentation

Stone ablation rates of a concept 100W pulse-modulated Holmium:YAG laser

Thomas Hasenberg, Bingyuan Yang, Ben Turney, Isha Parab, Jasmine Cancino, Sanwei Liu, Dongyul Chai, Aditi Ray, Tim Harrah, Hyun Kang

Proceedings Volume 11619, 1161907 (2021) https://doi.org/10.1117/12.2579016

KEYWORDS: Laser ablation, Prototyping, Fiber lasers, Surgery, Renal calculi, Pulsed laser operation, Laser vision correction, Laser therapeutics, Holmium

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Proceedings Article | 5 March 2021 Presentation

Effect of holmium:YAG laser pulse modulation on lithotripsy particle size: a bench study

Sanwei Liu, Aditi Ray, James Zhang, Dongyul Chai, Jason Xuan, Steven Peng, Thomas Hasenberg, Hyun Kang, Bingyuan Yang, Ben Turney, Tim Harrah

Proceedings Volume 11619, 1161909 (2021) https://doi.org/10.1117/12.2578831

KEYWORDS: Particles, Pulsed laser operation, Modulation, Laser therapeutics, YAG lasers, Rutherfordium, Laser applications, Laser ablation, Holmium, Fiber lasers

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Proceedings Article | 5 March 2021 Presentation + Paper

The optimal dusting mode for Ho:YAG laser lithotripsy

Jian Zhang, Dongyul Chai, Jason Xuan, Aditi Ray, Thomas Hasenberg, Timothy Harrah

Proceedings Volume 11619, 116190E (2021) https://doi.org/10.1117/12.2578984

KEYWORDS: Laser ablation, Laser lithotripsy, Laser systems engineering, Performance modeling, In vitro testing, High power lasers

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Proceedings Article | 5 March 2021 Presentation

Stone retropulsion rates of a 100W pulse-modulated Holmium:YAG laser

Aditi Ray, Thomas Hasenberg, Hyun Wook Kang, Tim Harrah, Sanwei Liu, Bingyuan Yang, Ben Turney, Isha Parab, Jasmine Cancino, Jian James Zhang, Longquan Chen

Proceedings Volume 11619, 116190A (2021) https://doi.org/10.1117/12.2578996

KEYWORDS: Laser lithotripsy, Laser therapeutics, Pulsed laser operation, Prototyping, Laser ablation, Thermography, Thermal effects, Physical phenomena, Modulation

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Proceedings Article | 20 February 2020 Paper

Tissue temperature monitoring during laser vaporization through black body radiation at wavelengths less than 1.8 um

Hui Zhu, Xiaomei Wang, Ray Chia, Tom Hasenberg, Hui Wang, Paris Franz

Proceedings Volume 11238, 1123819 (2020) https://doi.org/10.1117/12.2545105

KEYWORDS: Temperature sensors, Fiber optics sensors, Laser ablation, Optical fibers, Short wave infrared radiation

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Proceedings Article | 19 February 2020 Presentation + Paper

In search of optimal settings for Ho:YAG laser-lithotripsy to maximize the ablation rate, while minimizing the retropulsion

Jian Zhang, Dongyul Chai, Jason Xuan, Aditi Ray, Thomas Hasenberg, Timothy Harrah

Proceedings Volume 11212, 1121204 (2020) https://doi.org/10.1117/12.2544546

KEYWORDS: Pulsed laser operation, Laser ablation, Laser therapeutics, Laser energy, Laser lithotripsy, Video, In vitro testing, Electronic test equipment, Diffractive optical elements

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Although laser lithotripsy is now the preferred treatment option for urolithiasis due to shorter operation time and a better stone-free rate [1], the optimal laser settings for URS (Ureteroscopic lithotripsy) to enable shorter operating times remain unclear. This study aims to identify optimal laser settings for Ho:YAG laser-lithotripsy to maximize the ablation rate while minimizing the retropulsion, as well as to improve the discharge of fragments via the urinary tract. The net result will be an increase in treatment success and patient satisfaction by ameliorating the stone-free rate.

In vitro investigations of Ho:YAG laser-induced stone ablation and retropulsion were performed with a bench top model first introduced by Sroka’s group [2]. A commercial Ho:YAG laser system (Lumenis VersaPulse PowerSuite 100W, Lumenis Ltd., Yokneam, Israel) was used as the laser pulse source, with pulse energy from 0.2 J up to 1.5 J and repetition rate from 5 to 40 Hz. A DOE with two replicate points and two lack-of-fit points was performed on artificial BEGO stones of sample size 14 under reproducible experimental conditions (fiber size: 365 μm, S-LLF365 SureFlex Fiber, Boston Scientific Corporation, San Jose, CA, USA). The best fit to the experimental data was analyzed utilizing the design of experiment software, which can produce the numerical formulas for the response surfaces of ablation rate and retropulsion in terms of laser pulse parameters [3].

The coded numerical formulas for the response surfaces of ablation speed and retropulsion velocity are generated. The coded equation is useful for identifying the relative impact of the factors by comparing their coefficients. Upon examination of the laser ablation of stone phantoms (BEGO), the laser pulse energy is 1.4 times the impact of the frequency, and laser pulse peak power’s impact is the same as the frequency; while for retropulsion, the laser pulse energy is 5.8 times as the impact of the frequency, and laser pulse peak power’s impact is 13 times as the frequency; A series of laser settings for relatively efficient laser lithotripsy were identified in terms of laser pulse energy and peak power.

The laser pulse energy or peak power in reference to frequency has a higher impact coefficient to stone retropulsion as compared to stone ablation in Ho:YAG laser-lithotripsy. The most effective way to reduce stone retropulsion during laser lithotripsy is to reduce the laser pulse peak power (which has the highest impact coefficient in the coded response equation).

Proceedings Article | 4 March 2019 Presentation

The study of Ho: YAG laser ablation thresholds of calculus phantom in terms of peak power density (Conference Presentation)

Jian Zhang, Dongyul Chai, Nazia Podana, Rongwei Xuan, Thomas Hasenberg, Timothy Harrah

Proceedings Volume 10852, 108520D (2019) https://doi.org/10.1117/12.2510122

KEYWORDS: Laser ablation, YAG lasers, Holmium, Laser damage threshold, Calculus, Pulsed laser operation, Laser lithotripsy, Fiber lasers, Laser energy, Photodiodes

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Proceedings Article | 20 February 2017 Presentation + Paper

The study of laser pulse width on efficiency of Ho:YAG laser lithotripsy

Jian Zhang, Jonathan Rutherford, Jason Xuan, Jason Gong, Honggang Yu, Michael Xia, Xirong Yang, Thomas Hasenberg, Sean Curran, Metasebya Solomon, Brian Cheng

Proceedings Volume 10038, 100380H (2017) https://doi.org/10.1117/12.2250665

KEYWORDS: Pulsed laser operation, Laser therapeutics, Calculus, Laser lithotripsy, Calculi, Microscopes, High speed cameras, Fiber lasers, Cements, Tissues

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SPIE Journal Paper | 10 December 2015 Open Access

Water content contribution in calculus phantom ablation during Q-switched Tm:YAG laser lithotripsy

Jian Zhang, Danop Rajabhandharaks, Jason Rongwei Xuan, Hui Wang, Ray W. Chia, Thomas Hasenberg, Hyun Wook Kang

JBO, Vol. 20, Issue 12, 128001, (December 2015) https://doi.org/10.1117/12.10.1117/1.JBO.20.12.128001

KEYWORDS: Calculus, Laser ablation, Pulsed laser operation, Q switched lasers, Laser lithotripsy, Laser therapeutics, Absorption, Fiber lasers, Cements, Calculi

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Proceedings Article | 13 March 2014 Paper

Quasi-dynamical analysis and real-time tissue temperature monitoring during laser vaporization

Hui Wang, Aditi Ray, Ray Chia, Tom Hasenberg, Dave Jebens

Proceedings Volume 8941, 89410K (2014) https://doi.org/10.1117/12.2041293

KEYWORDS: Tissues, Laser ablation, Laser tissue interaction, Prostate, Tissue optics, In vivo imaging, Fiber lasers, Pulsed laser operation, Laser therapeutics

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Proceedings Article | 4 March 2014 Paper

Characterization of calculus migration during Ho:YAG laser lithotripsy by high speed camera using suspended pendulum method

Jian James Zhang, Danop Rajabhandharaks, Jason Rongwei Xuan, Ray W. J. Chia, Tom Hasenberg

Proceedings Volume 8926, 89261I (2014) https://doi.org/10.1117/12.2037888

KEYWORDS: Calculus, High speed cameras, Pulsed laser operation, Laser lithotripsy, Fiber lasers, Holmium, Laser therapeutics, Cameras, Cements, In vitro testing

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Proceedings Article | 18 March 2013 Paper

879nm pump diode stack and single Nd:YAG rod design to achieve 20W to 300W adjustable laser output power at 532nm and 38% optical to optical conversion efficiency

Jason Xuan, Xirong Yang, Mike Scott, T. Hasenberg

Proceedings Volume 8599, 85991H (2013) https://doi.org/10.1117/12.2005492

KEYWORDS: Absorption, Diodes, Nd:YAG lasers, Semiconductor lasers, Quantum efficiency, Laser development, Laser systems engineering, Solid state lasers, High power lasers, Laser applications

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Proceedings Article | 8 March 2013 Paper

Dependence of water content in calculus phantom during Q-switched Tm:YAG laser lithotripsy

Danop Rajabhandharaks, Jian Zhang, Hui Wang, Jason Xuan, Ray W. Chia, Tom Hasenberg, Hyun Wook Kang

Proceedings Volume 8565, 856519 (2013) https://doi.org/10.1117/12.2004830

KEYWORDS: Calculus, Laser ablation, Q switched lasers, Laser lithotripsy, Pulsed laser operation, Glasses, Absorption, Cements, Calculi, Fiber lasers

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Proceedings Article | 18 February 2010 Paper

Progress in high-brightness diode laser development based on tailored diode laser bars

D. Grasso, N. Shou, S. Roh, R. Pathak, T. Hasenberg, D. Schleuning, G. Cheung

Proceedings Volume 7583, 758310 (2010) https://doi.org/10.1117/12.842785

KEYWORDS: Semiconductor lasers, Polarization, Diodes, Fiber lasers, Fiber coupled lasers, Laser applications, Lasers, Laser marking, Laser development, Nd:YAG lasers

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Proceedings Article | 24 February 2009 Paper

High-brightness kW QCW diode laser stacks with ultra-low pitches

Eli Weiss, Calvin Luong, David Schleuning, Rajiv Pathak, Tom Hasenberg

Proceedings Volume 7198, 719802 (2009) https://doi.org/10.1117/12.809637

KEYWORDS: Semiconductor lasers, Temperature metrology, Finite element methods, Data modeling, Reliability, Diodes, Heatsinks, Solid state lasers, Instrument modeling, Packaging

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Proceedings Article | 24 February 2009 Paper

915 nm laser bar-based high-performance sources for fiber laser pumping

Dan Grasso, Nels Ostrom, Rajiv Pathak, Heiko Winhold, Jouko Haapamaa, David Roh, Sami Lehkonen, Jason Watson, Mika Toivonen, David Schleuning, T. Hasenberg, Juergen Pfaff, Eli Weiss, John Minelly

Proceedings Volume 7198, 719808 (2009) https://doi.org/10.1117/12.809785

KEYWORDS: Fiber lasers, Reliability, Diodes, Semiconductor lasers, Absorption, Packaging, Ytterbium, Measurement devices, Laser applications, Optical pumping

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Proceedings Article | 24 February 2009 Paper

Material survey for packaging semiconductor diode lasers

Heiko Winhold, Rajiv Pathak, Calvin Luong, Christian Scholz, Bo Guo, Jason Watson, Kenneth Scholz, Mike Griffin, Tom Hasenberg, David Schleuning

Proceedings Volume 7198, 71981K (2009) https://doi.org/10.1117/12.809314

KEYWORDS: Semiconductor lasers, Packaging, Semiconductors, Copper, Resistance, Composites, Gallium arsenide, Finite element methods, Diamond, Indium

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Proceedings Article | 24 February 2009 Paper

High-brightness fiber-coupled pump sources at 88X nm and 79X nm

S. Tolman, R. Pathak, E. Weiss, D. Schleuning, M. Griffin, H. Winhold, J. Watson, T. Hasenberg

Proceedings Volume 7198, 71980U (2009) https://doi.org/10.1117/12.809723

KEYWORDS: Reflectivity, Semiconductor lasers, Fiber couplers, Fiber lasers, Diodes, Laser development, Coating, Lawrencium, Fiber coupled lasers, Fiber Bragg gratings

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Proceedings Article | 13 February 2008 Paper

8xxnm kW conduction cooled QCW diode arrays with both electrically conductive and insulation submounts

Murray Reed, John Morales, David Schleuning, Hailong Zhou, Jihua Du, Thomas Hasenberg, Vivek Agrawal

Proceedings Volume 6876, 687605 (2008) https://doi.org/10.1117/12.764230

KEYWORDS: Diodes, Temperature metrology, Semiconductor lasers, Dielectrics, Solid state lasers, Nd:YAG lasers, Reliability, Continuous wave operation, Optical pumping, Thermal modeling

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Proceedings Article | 13 February 2008 Paper

High-brightness line generators and fiber-coupled sources based on low-smile laser diode arrays

D. Schleuning, H. Winhold, P. Lavikko, P. Lovato, S. Tolman, T. Hasenberg, M. Griffin, P. Liang, D. Lee, T. Alander, J. Watson, M. Reed

Proceedings Volume 6876, 68760V (2008) https://doi.org/10.1117/12.765472

KEYWORDS: Fiber couplers, Semiconductor lasers, Indium, Fiber lasers, Polarization, Cameras, Materials processing, Free space optics, Laser development, Reliability

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Proceedings Article | 1 April 1999 Paper

Comparison of mid-infrared laser diode active regions

Scott Anson, Thomas Boggess, Jonathon Olesberg, Tom Hasenberg, Michael Flatte, Bennett Brown, Christoph Grein

Proceedings Volume 3628, (1999) https://doi.org/10.1117/12.344541

KEYWORDS: Quantum wells, Indium arsenide, Superlattices, Semiconductor lasers, Absorption, Mid-IR, Waveguides, Active optics, Quantum efficiency, Laser development

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Proceedings Article | 2 May 1997 Paper

3 to 5-um lasers employing GaInSb/InAs superlattice active layers

Richard Miles, L. West, Tom Hasenberg, Alan Kost

Proceedings Volume 3001, (1997) https://doi.org/10.1117/12.273801

KEYWORDS: Superlattices, Semiconductor lasers, Cladding, Electrons, Indium arsenide, Gallium indium arsenide antimonide phosphide, Gallium antimonide, Resistance, Mid-IR, Laser development

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Proceedings Article | 19 April 1996 Paper

GaInSb/InAs superlattice-based infrared lasers

Tom Hasenberg, L. West, Alan Kost, Richard Miles

Proceedings Volume 2694, (1996) https://doi.org/10.1117/12.238382

KEYWORDS: Superlattices, Indium arsenide, Diodes, Semiconductor lasers, Infrared lasers, Mid-IR, Cladding, Gallium antimonide, Laser development, Continuous wave operation

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Proceedings Article | 28 April 1995 Paper

Mid-infrared semiconductor lasers with GaInSb/InAs type-II superlattices

L. West, Richard Miles, Tom Hasenberg, David Chow, Alan Kost

Proceedings Volume 2382, (1995) https://doi.org/10.1117/12.208460

KEYWORDS: Superlattices, Semiconductor lasers, Mid-IR, Cladding, Gallium antimonide, Quantum wells, Calibration, Gallium indium arsenide antimonide phosphide, Semiconductors, Optical alignment

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