Peter R. Herman

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.

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.

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.

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.

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.