# Controlling ultrafast laser writing in silica glass by pulse temporal contrast

Source: [Controlling ultrafast laser writing in silica glass by pulse temporal contrast](<https://www.sota2.com/research/paper/68fa462e1e209131ce91e4b9>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-25T05:40:53.617Z

Authors: Yuhao Lei, Huijun Wang, Gholamreza Shayeganrad, Yuri Svirko, Peter G. Kazansky

Published: 2024-01-17T08:43:19.000Z

## Abstract

Control of laser writing in transparent dielectrics using temporal contrast of light pulses is demonstrated. Anisotropic nanopores in silica glass are produced by high-contrast of 10^7 femtosecond Yb: KGW laser pulses rather than low-contrast of 10^3 Yb fiber laser pulses. Low-contrast pulses are useful for creating lamellar birefringent structures, possibly driven by quadrupole nonlinear current. The difference originates in the fiber laser storing third of its energy in a post-pulse of 200 ps duration. The absorption of this low-intensity fraction of the pulse by laser-induced transient defects with relatively long lifetime and low excitation energy, such as self-trapped holes, drastically changes the kinetics of energy deposition and type of material modification.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2401.09055>)

[PDF](<https://arxiv.org/pdf/2401.09055.pdf>)