Journal
OPTICS LETTERS
Volume 43, Issue 15, Pages 3702-3705Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.003702
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Funding
- Air Force Office of Scientific Research (AFOSR) [FA9550-16-1-0069, FA9550-16-1-0013]
- National Science Foundation (NSF) [1605042]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1605042] Funding Source: National Science Foundation
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Femtosecond laser-induced damage and ablation (fs-LIDA) is a rich field in extreme non-perturbative nonlinear optics with wide ranging applications, induding laser micro- and nano-machining, waveguide writing, and eye surgery. Our understanding of fs-LIDA, however, is limited mostly to visible and near-infrared wavelengths. In this work, we systematically study single-shot, fs-laser ablation (fs-LIA) of single-crystal germanium from near- to mid-infrared wavelengths, and compare the fs-LIA wavelength scaling with two widely used models. We show that these models are inadequate, particularly at mid-infrared wavelengths. Instead, a hybrid model is proposed involving Keldysh ionization rates, a constant free-carrier density threshold, and multi-band effects, which yields good agreement with experimental observations. Aspects of this model may be applied to understanding other strong-field non-perturbative phenomena in solids. (C) 2018 Optical Society of America
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