Research on Hole Depth in Femtosecond Laser Deep Micropore Processing Technology Based on Filament Effect

Optik ◽  
2021 ◽  
pp. 168307
Author(s):  
Bin Liu ◽  
Yingjie Yan ◽  
Kai Liao ◽  
Wenjun Wang ◽  
Xuesong Mei
Keyword(s):  
Femtosecond Laser ◽  
Processing Technology ◽  
Hole Depth

scholarly journals Research on Microhole Processing Technology Based on the Femtosecond-Laser Spiral Trepanning Method

2020 ◽  
Vol 10 (21) ◽  
pp. 7508
Author(s):  
Fengping Li ◽  
Guang Feng ◽  
Xiaojun Yang ◽  
Xiaogang Li ◽  
Guang Ma ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Automotive Industry ◽  
Power Distribution ◽  
Normal Cone ◽  
Laser Energy ◽  
Processing Technology ◽  
Practical Significance ◽  
Formation Mechanisms ◽  
Spiral Scanning ◽  
Scanning Path

Microholes have crucial applications in aerospace, the automotive industry, and other industries. In this study, the microhole processing technology based on the femtosecond-laser spiral trepanning method was investigated. By adjusting the spiral scanning path, laser power distribution, and defocusing amount to control laser energy distribution, an inverted cone hole, straight hole, and normal cone hole were obtained finally. The morphology and element of the microhole were investigated by scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX). The experimental results of the femtosecond-laser spiral trepanning method could achieve fewer impurities. Finally, the formation mechanisms of different microholes are explained in detail. The method is simpler and more efficient than the traditional microhole processing technology. The femtosecond-laser spiral trepanning method with controllable hole roundness, accuracy, and taper has important practical significance in microhole processing.

Progress in Femtosecond Laser Processing Technology Based on Space Beam Shaping

2020 ◽  
Vol 57 (11) ◽  
pp. 111416
Author(s):  
孔德键 Kong Dejian ◽  
孙小燕 Sun Xiaoyan ◽  
董卓林 Dong Zhuolin ◽  
胡友旺 Hu Youwang ◽  
段吉安 Duan Ji''an
Keyword(s):  
Femtosecond Laser ◽  
Laser Processing ◽  
Beam Shaping ◽  
Processing Technology ◽  
Femtosecond Laser Processing

Influence of substrate cooling on femtosecond laser machined hole depth and diameter

2007 ◽  
Vol 89 (2) ◽  
pp. 559-563 ◽  
Author(s):  
H.Y. Zheng ◽  
Y.C. Lam ◽  
C. Sundarraman ◽  
D.V. Tran
Keyword(s):  
Femtosecond Laser ◽  
Hole Depth ◽  
Influence Of Substrate

Digital differential hysteresis iimage processing displays what the microscope acquires but the eye can't see

1995 ◽  
Vol 53 ◽  
pp. 642-643
Author(s):  
Klaus-Ruediger Peters
Keyword(s):  
Image Processing ◽  
Visual System ◽  
High Precision ◽  
Image Data ◽  
Processing Technology ◽  
Output Data ◽  
Contrast Resolution ◽  
Pixel Intensity ◽  
Data Reading ◽  
Hysteresis Properties

Differential hysteresis processing is a new image processing technology that provides a tool for the display of image data information at any level of differential contrast resolution. This includes the maximum contrast resolution of the acquisition system which may be 1,000-times higher than that of the visual system (16 bit versus 6 bit). All microscopes acquire high precision contrasts at a level of <0.01-25% of the acquisition range in 16-bit - 8-bit data, but these contrasts are mostly invisible or only partially visible even in conventionally enhanced images. The processing principle of the differential hysteresis tool is based on hysteresis properties of intensity variations within an image.Differential hysteresis image processing moves a cursor of selected intensity range (hysteresis range) along lines through the image data reading each successive pixel intensity. The midpoint of the cursor provides the output data. If the intensity value of the following pixel falls outside of the actual cursor endpoint values, then the cursor follows the data either with its top or with its bottom, but if the pixels' intensity value falls within the cursor range, then the cursor maintains its intensity value.

Nanosecond laser-induced breakdown assisted by femtosecond laser pre-ionization in air: the effect on spatial resolution and continuous radiation

2020 ◽  
Vol 92 (2) ◽  
pp. 20701
Author(s):  
Bo Li ◽  
Xiaofeng Li ◽  
Zhifeng Zhu ◽  
Qiang Gao
Keyword(s):  
Femtosecond Laser ◽  
Spatial Resolution ◽  
Laser Induced Breakdown Spectroscopy ◽  
Nanosecond Laser ◽  
Breakdown Threshold ◽  
Powerful Technique ◽  
Breakdown Spectroscopy ◽  
Continuous Radiation ◽  
Laser Induced Breakdown

Laser-induced breakdown spectroscopy (LIBS) is a powerful technique for quantitative diagnostics of gases. The spatial resolution of LIBS, however, is limited by the volume of plasma. Here femtosecond-nanosecond dual-pulsed LIBS was demonstrated. Using this method, the breakdown threshold was reduced by 80%, and decay of continuous radiation was shortened. In addition, the volume of the plasma was shrunk by 85% and hence, the spatial resolution of LIBS was significantly improved.

Femtosecond laser assisted penetrating keratoplasty

2006 ◽  
Vol 223 (S 1) ◽  
Author(s):  
MP Holzer ◽  
TM Rabsilber ◽  
GU Auffarth
Keyword(s):  
Femtosecond Laser ◽  
Penetrating Keratoplasty
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