Experimental Investigation of Polymeric Material Removal by Low Diffraction Laser Beam

2002 ◽  
Vol 124 (2) ◽  
pp. 475-480
Author(s):  
Xuanhui Lu ◽  
Y. Lawrence Yao ◽  
Kai Chen
Keyword(s):  
Laser Beam ◽  
Polymeric Material ◽  
Material Removal ◽  
Beam Quality ◽  
Power Level ◽  
Average Power ◽  
Laser Material ◽  
Theoretical Predictions ◽  
Removal Processes

Effects of improved beam quality of a low diffraction laser beam on laser material removal processes are experimentally investigated in a polymeric material. The experimental results are in agreement with theoretical predictions. The results show that the low diffraction beam has marked advantages over the Gaussian beam in ablation-dominated material removal processes in terms of larger depth and smaller taper at the same average power level.

scholarly journals 1178 J, 527 nm near diffraction limited laser based on a complete closed-loop adaptive optics controlled off-axis multi-pass amplification laser system

2021 ◽  
Vol 9 ◽  
Author(s):  
Deen Wang ◽  
Xin Zhang ◽  
Wanjun Dai ◽  
Ying Yang ◽  
Xuewei Deng ◽  
...  
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Closed Loop ◽  
Focal Spot ◽  
Beam Quality ◽  
Laser System ◽  
Diffraction Limit ◽  
Kdp Crystal ◽  
Main Amplifier

Abstract A 1178 J near diffraction limited 527 nm laser is realized in a complete closed-loop adaptive optics (AO) controlled off-axis multi-pass amplification laser system. Generated from a fiber laser and amplified by the pre-amplifier and the main amplifier, a 1053 nm laser beam with the energy of 1900 J is obtained and converted into a 527 nm laser beam by a KDP crystal with 62% conversion efficiency, 1178 J and beam quality of 7.93 times the diffraction limit (DL). By using a complete closed-loop AO configuration, the static and dynamic wavefront distortions of the laser system are measured and compensated. After correction, the diameter of the circle enclosing 80% energy is improved remarkably from 7.93DL to 1.29DL. The focal spot is highly concentrated and the 1178 J, 527 nm near diffraction limited laser is achieved.

scholarly journals A molecular dynamics based digital twin for ultrafast laser material removal processes

2020 ◽  
Vol 108 (1-2) ◽  
pp. 413-426 ◽  
Author(s):  
Panagiotis Stavropoulos ◽  
Alexios Papacharalampopoulos ◽  
Lydia Athanasopoulou
Keyword(s):  
Molecular Dynamics ◽  
Material Removal ◽  
Ultrafast Laser ◽  
Laser Material ◽  
Digital Twin ◽  
Removal Processes

Laser beam quality of a high-PRF XeCl laser

1993 ◽  
Author(s):  
Olivier P. Uteza ◽  
Marc L. Sentis ◽  
Philippe C. Delaporte ◽  
Bernard M. Forestier ◽  
Bernard L. Fontaine ◽  
...  
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Xecl Laser ◽  
Laser Beam Quality

Improving Slow-Axis Laser Beam Quality of Semiconductor Laser with Edge Adiabatic Package

2020 ◽  
Vol 47 (1) ◽  
pp. 0105002
Author(s):  
赵碧瑶 Zhao Biyao ◽  
井红旗 Jing Hongqi ◽  
仲莉 Zhong Li ◽  
曼玉选 Man Yuxuan ◽  
班雪峰 Ban Xuefeng ◽  
...  
Keyword(s):  
Laser Beam ◽  
Semiconductor Laser ◽  
Beam Quality ◽  
Slow Axis ◽  
Laser Beam Quality

A Cascaded Multi- and Single-Mode Fiber Transporting for Laser Beam

2011 ◽  
Vol 109 ◽  
pp. 222-227
Author(s):  
Zhi Gang Xiao ◽  
Yao Jiang ◽  
Xiao Xiao
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Coupling Efficiency ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Butt Joint ◽  
Joint Coupling ◽  
Mode Field ◽  
Theoretical Predictions ◽  
Multi Mode

A model to calculate the butt-joint coupling efficiency between a multi-mode fiber to a single-mode fiber is presented based on a mode field coupling theory. The dependence of the coupling efficiency between the multi- and single-mode fibers on the core radius of the multi-mode fiber is investigated. A experiment is conducted with 532nm laser to measure the butt joint coupling efficiency of a multi-mode fiber to a single-mode fiber. Good agreement is obtained between the experimental results and the theoretical predictions. A cascaded multi- and single-mode fiber relay system is proposed to transport a laser beam with high power and good beam quality.

Laser beam quality of high pulse repetition frequency excimer lasers

1993 ◽  
Vol 102 (5-6) ◽  
pp. 523-531 ◽  
Author(s):  
O.P. Uteza ◽  
M.L. Sentis ◽  
Ph.C. Delaporte ◽  
B.M. Forestier ◽  
B.L. Fontaine
Keyword(s):  
Laser Beam ◽  
Beam Quality ◽  
Pulse Repetition Frequency ◽  
Repetition Frequency ◽  
Pulse Repetition ◽  
Excimer Lasers ◽  
Laser Beam Quality ◽  
High Pulse ◽  
High Pulse Repetition Frequency

Analisis Soal Matematika Tipe Higher Order Thinking Skills (HOTS) Tingkat SMP

2020 ◽  
Vol 2 (2) ◽  
pp. 112-129
Author(s):  
Lelly Oktafiana ◽  
Iis Holisin ◽  
Himmatul Mursyidah
Keyword(s):  
Power Level ◽  
Thinking Skills ◽  
Higher Order Thinking Skills ◽  
National Examination ◽  
Class Viii ◽  
Valid Test ◽  
Grade Material ◽  
Data Collection Technique ◽  
High Level

This study aims to describe the quality of the 2018 Mathematics National Examination (UN) in the HOTS types at the junior high level in terms of the level of validity, reliability, problem differentiation power, level of difficulty and distractor. This type of research is a descriptive study. The research was conducted at SMP Muhammadiyah 4 Surabaya and SMP Negeri 13 Surabaya for students in class VIII. The data collection technique used is a test. The test was taken from the 2018 math UN questions in odd semester VIII grade material including HOTS type. The number of UN mathematics questions in 2018 in the odd semester VIII class material consisted of 12 questions with 25% including LOTS types and 75% including HOTS types. The results showed: (1) 100% valid test questions, (2) high question reliability, (3) good problem differentiation power, (4) the difficuly level of the question 77,77% categorized as moderate and 2 question 22,23% are categorized as difficult, (5) there are 2 questions with one of the answer options do not work.

scholarly journals Effect of Laser Beam Focusing Adjustment on the Processing Quality of Aluminum Nitride Ceramic Micro-Holes

2021 ◽  
Vol 1865 (2) ◽  
pp. 022004
Author(s):  
Chunyan Yang ◽  
Yun Hao ◽  
Yangping Li ◽  
Bozhe Wang ◽  
Hai Yuan ◽  
...  
Keyword(s):  
Aluminum Nitride ◽  
Laser Beam ◽  
Processing Quality ◽  
Beam Focusing ◽  
Micro Holes
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