Lawrence Shah

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: In this paper, the relationship between the laser process conditions and the dimensions and quality of the seam was investigated by means of optical and phase-contrast microscopy, which revealed a tensile strength of greater than 80% of the bulk material strength.

TL;DR: In this paper, the authors describe classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings, and modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.

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.

TL;DR: In this paper, a femtosecond laser based laser processing system has been proposed for the utilization of the unique heat control in micromachining, and the system has greater output beam stability, continuously variable repetition rate and unique temporal beam shaping capabilities.