P
Peter R. Herman
Researcher at University of Toronto
Publications - 297
Citations - 7075
Peter R. Herman is an academic researcher from University of Toronto. The author has contributed to research in topics: Laser & Femtosecond. The author has an hindex of 42, co-authored 290 publications receiving 6634 citations. Previous affiliations of Peter R. Herman include Osaka University & University of Cambridge.
Papers
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Journal ArticleDOI
Heat accumulation effects in femtosecond laser-written waveguides with variable repetition rate.
Shane M. Eaton,Haibin Zhang,Peter R. Herman,Fumiyo Yoshino,Lawrence Shah,James Bovatsek,Alan Y. Arai +6 more
TL;DR: High-repetition rate femtosecond lasers are shown to drive heat accumulation processes that are attractive for rapid writing of low-loss optical waveguides in transparent glasses and accurately tracks the waveguide diameter as cumulative heating expands the modification zone above 200-kHz repetition rate.
Journal ArticleDOI
Transition from thermal diffusion to heat accumulation in high repetition rate femtosecond laser writing of buried optical waveguides
TL;DR: Waveguide morphology and thermal modeling indicate that strong thermal diffusion effects at 200 kHz give way to a weak heat accumulation effect at approximately 1 microJ pulse energy for generating low loss waveguides, while stronger heat accumulation effects above 1-MHz repetition rate offered overall superior guiding.
Patent
Burst-ultrafast laser machining method
TL;DR: In this article, the authors proposed a method of laser processing or laser modification of materials using a combination of ultrafast laser pulses and high-repetition rate (>100 kHz) bursts, which defines a new and unexpected regime for material processing.
Patent
Method of material processing by laser filamentation
TL;DR: In this article, a method for the internal processing of a transparent substrate in preparation for a cleaving step is provided, where the substrate is irradiated with a focused laser beam that is comprised of pulses having an energy and pulse duration selected to produce a filament within the substrate.
Journal ArticleDOI
Waveguide writing in fused silica with a femtosecond fiber laser at 522 nm and 1 MHz repetition rate
TL;DR: Waveguide writing in fused silica with a novel commercial femtosecond fiber laser system (IMRA America, FCPA microJewel) and the influence of a range of laser parameters were investigated, finding that it was not possible to produce low-loss waveguides when writing with the fundamental wavelength of 1045 nm, but it was possible to fabricate telecom-compatible waveguide at the second harmonic wavelength of 522 nm.