Dr. Steven Peng Profile

Dr. Steven Peng

R&D Fellow at Shockwave Medical

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Author

Publications (11)

Proceedings Article | 17 March 2023 Presentation

Relaxation oscillation simulation of Ho-YAG lithotripsy laser

Steven Peng, Jian Zhang

Proceedings Volume PC12353, PC1235305 (2023) https://doi.org/10.1117/12.2650399

KEYWORDS: Laser therapeutics, Optical simulations, Pulsed laser operation, Optical coatings, Modes of laser operation, Laser resonators, Laser lithotripsy, Laser induced damage, Laser damage threshold, Control systems

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Proceedings Article | 14 March 2023 Presentation + Paper

Laser beam profile variation through Ho:YAG laser lithotripsy fibers

Jian Zhang, Alex Lemieux, Steven Peng, Mike O'Brien

Proceedings Volume 12353, 1235308 (2023) https://doi.org/10.1117/12.2649363

KEYWORDS: Laser therapeutics, Fiber lasers, Laser energy, Laser lithotripsy, Power meters, Laser beam diagnostics, Optical spheres, Near field optics, Microscopes, Beam quality measurement, Fiber characterization, Fiber optics tests

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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 | 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, Tim Harrah, Bingyuan Yang, Ben Turney, Hyun Kang, Thomas Hasenberg

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 | 6 March 2020 Presentation

Numerical simulations of bubble dynamics in laser lithotripsy (Conference Presentation)

Steven Peng

Proceedings Volume 11212, 112120F (2020) https://doi.org/10.1117/12.2547439

KEYWORDS: Laser lithotripsy, Numerical simulations, Spherical lenses, Pulsed laser operation, Laser therapeutics, Biomedical engineering, Renal calculi, Infrared lasers, High speed cameras, Imaging systems

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Proceedings Article | 14 March 2018 Presentation

A novel Holmium:YAG fiber design to transmit high power with tight-bend for laser lithotripsy (Conference Presentation)

Steven Peng

Proceedings Volume 10468, 1046805 (2018) https://doi.org/10.1117/12.2291095

KEYWORDS: Fiber lasers, Thermal modeling, Holmium, Connectors, Laser lithotripsy, YAG lasers, Optical simulations, Thermography, Ray tracing, Optical fibers

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Objective: To design a durable holmium laser fiber with high power, good transmission efficiency, flexible, and tight bend for holmium YAG laser lithotripsy. The new design has improved the common issues for existing Ho: YAG laser fibers including fiber fracture at bend, fiber burnt, and connector over heat. Methods and Materials: We developed fiber modeling including ray-tracing optical simulation and CFD thermal modeling. Utilizing optical simulation, we find the over-fill and offset laser light leaking into the glass capillary was effectively absorbed by the fiber and SMA connector. The connector and fiber temperature increases were calculated using CFD thermal modeling based on the optical absorption from the ray-tracing. We introduced dimpled surfaces on the glass capillary tube to strip off the un-wanted rays to prevent the fiber from burning and the connector from overheating. We built and tested several small core (242 um) Super fiber samples for testing on different holmium laser systems (Lumenis P120H and VersaPulse® 100W). We evaluated the fiber durability under high power and tight bend conditions. The % transmission, fiber flexibility, and connector temperature were all measured under these conditions. Results: We observed good agreement between our fiber test results and our optical and thermal modeling. These results help to illuminate the root cause of the holmium fiber failure modes. Indeed, the test results show the SuperFiber is very durable. For example, it delivered more than 1,000,000 joules under several stringent operating conditions including high power (50- 60W) in air, high frequency (25- 80 Hz), and 180° bend diameters from 16 mm down to 6 mm. One SuperFiber still survived after being tested at 60W (60Hz*1J) and 48W (80Hz*0.6J) while being bent to an 8 mm diameter for 30 minutes in air. This fiber has also showed a low transmission change after bending from 16mm down to 6 mm diameter (low bending induced loss).

Proceedings Article | 7 February 2018 Paper

The effect of force on laser fiber burnback during lithotripsy

Ashkan Aryaei, Ray Chia, Steven Peng

Proceedings Volume 10468, 104680I (2018) https://doi.org/10.1117/12.2286285

KEYWORDS: Optical fibers, Fiber lasers, Laser therapeutics, Thermography, Laser ablation, Holmium, Optics manufacturing, Calibration, Microsystems, Microscopes

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Proceedings Article | 18 February 2011 Paper

Interaction between high power 532nm laser and prostatic tissue: in vivo evaluation for laser prostatectomy

Reza Malek, Hyun Wook Kang, Steven Yihlih Peng, Douglas Stinson, Michael Beck, Ed Koullick

Proceedings Volume 7883, 78831F (2011) https://doi.org/10.1117/12.875535

KEYWORDS: Prostate, Laser tissue interaction, Tissues, Laser ablation, Fiber lasers, Collagen, High power lasers, In vivo imaging, Laser development, Natural surfaces

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Proceedings Article | 18 February 2011 Paper

Interaction between high power 532nm laser and prostatic tissue: in vitro evaluation for laser prostatectomy

Hyun Wook Kang, Yihlih Steven Peng, Douglas Stinson

Proceedings Volume 7883, 78831E (2011) https://doi.org/10.1117/12.875517

KEYWORDS: Tissues, Laser ablation, Laser tissue interaction, Prostate, In vitro testing, Natural surfaces, Picosecond phenomena, High power lasers, Laser development, Laser systems engineering

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Proceedings Article | 18 February 2011 Paper

MoXy fiber with active cooling cap for bovine prostate vaporization with high power 200W 532 nm laser

Steven Peng, Hyun Wook Kang, Homa Pirzadeh, Douglas Stinson

Proceedings Volume 7883, 78831D (2011) https://doi.org/10.1117/12.875195

KEYWORDS: Tissues, Prostate, Fiber lasers, Laser ablation, In vitro testing, Metals, Laser systems engineering, Optical fibers, Energy efficiency, Transmittance

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Proceedings Article | 2 March 2010 Paper

Investigation of wavelength-dependent tissue ablation: visible (lambda= 532 nm) vs IR (lambda= 2.01 µm)

Hyun Wook Kang, Yihlih Steven Peng

Proceedings Volume 7548, 75481B (2010) https://doi.org/10.1117/12.841045

KEYWORDS: Tissues, Laser ablation, Laser tissue interaction, Visible radiation, Natural surfaces, Prostate, Continuous wave operation, Tissue optics, Infrared lasers, Kidney

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Showing 5 of 11 publications

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