Ultrafast laser interaction with fused silica: from damage threshold to nanomachining

2013 ◽  
Author(s):  
M. Sentis ◽  
B. Chimier ◽  
M. Lebugle ◽  
N. Sanner ◽  
O. Utéza ◽  
...  
Keyword(s):  
Damage Threshold ◽  
Fused Silica ◽  
Ultrafast Laser ◽  
Laser Interaction

scholarly journals Full Aperture CO2Laser Process to Improve Laser Damage Resistance of Fused Silica Optical Surface

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Wei Liao ◽  
Chuanchao Zhang ◽  
Xiaofen Sun ◽  
Lijuan Zhang ◽  
Xiaodong Yuan
Keyword(s):  
Damage Threshold ◽  
Fused Silica ◽  
Processing Temperature ◽  
Test Results ◽  
Optical Surface ◽  
Improved Method ◽  
Damage Resistance ◽  
Scanning Velocity ◽  
High Laser ◽  
Laser Flux

An improved method is presented to scan the full-aperture optical surface rapidly by using galvanometer steering mirrors. In contrast to the previous studies, the scanning velocity is faster by several orders of magnitude. The velocity is chosen to allow little thermodeposition thus providing small and uniform residual stress. An appropriate power density is set to obtain a lower processing temperature. The proper parameters can help to prevent optical surface from fracturing during operation at high laser flux. S-on-1 damage test results show that the damage threshold of scanned area is approximately 40% higher than that of untreated area.

scholarly journals Investigation of laser-induced damage threshold improvement mechanism during ion beam sputtering of fused silica

2017 ◽  
Vol 25 (23) ◽  
pp. 29260 ◽  
Author(s):  
Mingjin Xu ◽  
Feng Shi ◽  
Lin Zhou ◽  
Yifan Dai ◽  
Xiaoqiang Peng ◽  
...  
Keyword(s):  
Ion Beam ◽  
Damage Threshold ◽  
Fused Silica ◽  
Ion Beam Sputtering ◽  
Beam Sputtering ◽  
Laser Induced Damage

Thermal and Thermomechanical Phenomena During Ultrafast Laser Interaction With Tissue

2000 ◽  
Author(s):  
Xinwei Wang ◽  
Xianfan Xu ◽  
Lisa X. Xu
Keyword(s):  
Laser Ablation ◽  
Pulsed Laser ◽  
Pulsed Laser Ablation ◽  
Dielectric Materials ◽  
Biological Tissues ◽  
Clinical Applications ◽  
Ultrafast Laser ◽  
Collateral Damage ◽  
Laser Interaction ◽  
Tissue Removal

Abstract Ultrafast (or ultrashort) pulsed laser ablation of biological tissue has drawn much attention due to the minimal collateral damage caused by laser irradiation. Many clinical applications of ultrafast laser ablation have been proposed, including ophthalmology, dentistry, and neurosurgery (Kim et al., 1998). During ultrafast laser interaction with biological tissues, which are dielectric materials, multiphonon absorption occurs which enhances the absorption of the laser beam in tissue. The tissue can then be heated rapidly to a high temperature, causing evaporation and tissue removal.

A Two-Step Model for Multiple Picosecond and Femtosecond Pulses Ablation of Fused Silica

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Han Wang ◽  
Hong Shen ◽  
Zhenqiang Yao
Keyword(s):  
Light Intensity ◽  
Heat Affected Zone ◽  
Experimental Validation ◽  
Laser Pulses ◽  
Fused Silica ◽  
Ultrafast Laser ◽  
Damage Area ◽  
Ultrafast Laser Pulses ◽  
Step Model ◽  
Crater Morphology

The morphology of microchannels machined by multiple ultrafast laser pulses with 500 fs and 8 ps durations on fused silica plate is predicted by a two-step model with experimental validation in present work. A spike structure at crater boundary with different scales in 500 fs and 8 ps pulse ablation is found in the numerical investigation, which could be attributed to diffraction and attenuation of light intensity in both cases. To analyze the evolution of crater morphology and damaged area with an increasing number of pulses, the distribution of light intensity, lattice temperature, and self-trapped excitons density during certain pulses are studied. The results showed that 500 fs pulses lead to smoother crater boundary, smaller heat affected zone, and larger electrical damage area with respect to 8 ps pulses.

scholarly journals Laser-Induced Point Defects in Fused Silica Irradiated by UV Laser in Vacuum

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Xiaoyan Zhou ◽  
Xinda Zhou ◽  
Jin Huang ◽  
Qiang Cheng ◽  
Fengrui Wang ◽  
...  
Keyword(s):  
Point Defects ◽  
Fluorescence Spectra ◽  
Uv Spectroscopy ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Fused Silica ◽  
Third Harmonic ◽  
Structural Modifications ◽  
Laser Induced Damage ◽  
Induced Defects

High-purity fused silica irradiated by third harmonic of the Nd:YAG laser in vacuum with different laser pulse parameters was studied experimentally. Laser-induced defects are investigated by UV spectroscopy, and fluorescence spectra and correlated to the structural modifications in the glass matrix through Raman spectroscopy. Results show that, for laser fluence below laser-induced damage threshold (LIDT), the absorbance and intensity of fluorescence bands increase with laser energies and/or number of laser pulses, which indicates that laser-induced defects are enhanced by laser energies and/or number of laser pulses in vacuum. The optical properties of these point defects were discussed in detail.

scholarly journals Role of a native oxide on femtosecond laser interaction with silicon (100) near the damage threshold

2005 ◽  
Vol 86 (26) ◽  
pp. 264103 ◽  
Author(s):  
Joel P. McDonald ◽  
Arthur A. McClelland ◽  
Yoosuf N. Picard ◽  
Steven M. Yalisove
Keyword(s):  
Femtosecond Laser ◽  
Damage Threshold ◽  
Native Oxide ◽  
Laser Interaction
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