The Optimization of Termination in Combined Technique of Magnetorheological Finishing and HF Etching for Laser-Induced Damage Threshold High-Efficiency Improving of Fused Silica

2014 ◽  
Vol 1027 ◽  
pp. 199-202
Author(s):  
Ye Tian ◽  
Xiao Qiang Peng ◽  
Yi Fan Dai ◽  
Feng Shi ◽  
Wen Wan
Keyword(s):  
High Efficiency ◽  
Experimental Parameter ◽  
Damage Threshold ◽  
Fused Silica ◽  
Fdtd Simulation ◽  
Structural Defects ◽  
Process Time ◽  
Optical Elements ◽  
Laser Systems ◽  
Laser Induced Damage

The developing high-power laser systems are requiring higher laser-induced damage threshold (LIDT) and fabrication efficiency of fused silica optical elements. To solve these problems, MRF polishing and HF etching have been combined utilized wiping and passivating structural defects as well as removing impurities. Furthermore, the LIDT improvement is dependent greatly on the corporation of processes. But the LIDT improving mechanism is partly ambiguous yet, that may lead to random or experimental parameter choice and ultimately generate unsatisfied results. Consequently, this paper focuses on the termination mechanism of the process. Atom Force Microscope (AFM) measurement, finite difference time-domain (FDTD) simulation and LIDT test will be utilized to analysis and validate the optimization theoretically and practically. Finally, in one side, the LIDT value of optimized-terminated sample is 16.7J/cm2, which is about the same level (even 3.7% higher) as that of the over-etched one. In another side, the etching process time could be shorted by 32% using the optimized method.

scholarly journals Hexagonal boron nitride nanosheets incorporated antireflective silica coating with enhanced laser-induced damage threshold

2018 ◽  
Vol 6 ◽  
Author(s):  
Jing Wang ◽  
Chunhong Li ◽  
Wenjie Hu ◽  
Wei Han ◽  
Qihua Zhu ◽  
...  
Keyword(s):  
Boron Nitride ◽  
High Power ◽  
Damage Threshold ◽  
Fused Silica ◽  
High Power Laser ◽  
Power Laser ◽  
Silica Substrate ◽  
Laser Systems ◽  
Laser Induced Damage ◽  
Ar Coating

Boron nitride (BN) nanosheets incorporated silica antireflective (AR) coating was successfully prepared on fused silica substrate to improve the antilaser-damage ability of transmissive optics used in high-power laser systems. The BN nanosheets were obtained by urea assisted solid exfoliation, and then incorporated into basic-catalyzed silica sols without any further treatment. The transmission electron microscope (TEM) images indicated that the BN nanosheets generally consisted of 2–10 layers. The antireflective BN/$\text{SiO}_{2}$ coating exhibited excellent transmittance as high as 99.89% at 351 nm wavelength on fused silica substrate. The thermal conductivity $0.135~\text{W}\cdot \text{m}^{-1}\cdot \text{K}^{-1}$ of the BN/$\text{SiO}_{2}$ coating with 10% BN addition was about 23% higher than $0.11~\text{W}\cdot \text{m}^{-1}\cdot \text{K}^{-1}$ of the pure $\text{SiO}_{2}$ AR coating. The laser-induced damage threshold (LIDT) of that BN/$\text{SiO}_{2}$ coating is also 23.1% higher than that of pure $\text{SiO}_{2}$ AR coating. This research provides a potential application of BN/$\text{SiO}_{2}$ coatings in high-power laser systems.

scholarly journals Effects of Ion Beam Etching on the Nanoscale Damage Precursor Evolution of Fused Silica

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1294
Author(s):  
Yaoyu Zhong ◽  
Yifan Dai ◽  
Feng Shi ◽  
Ci Song ◽  
Ye Tian ◽  
...  
Keyword(s):  
Silica Surface ◽  
Ion Beam ◽  
Damage Threshold ◽  
Fused Silica ◽  
Structural Defects ◽  
Laser Damage ◽  
Material Structure ◽  
Ion Beam Etching ◽  
Damage Resistance ◽  
Laser Induced Damage

Nanoscale laser damage precursors generated from fabrication have emerged as a new bottleneck that limits the laser damage resistance improvement of fused silica optics. In this paper, ion beam etching (IBE) technology is performed to investigate the evolutions of some nanoscale damage precursors (such as contamination and chemical structural defects) in different ion beam etched depths. Surface material structure analyses and laser damage resistance measurements are conducted. The results reveal that IBE has an evident cleaning effect on surfaces. Impurity contamination beneath the polishing redeposition layer can be mitigated through IBE. Chemical structural defects can be significantly reduced, and surface densification is weakened after IBE without damaging the precision of the fused silica surface. The photothermal absorption on the fused silica surface can be decreased by 41.2%, and the laser-induced damage threshold can be raised by 15.2% after IBE at 250 nm. This work serves as an important reference for characterizing nanoscale damage precursors and using IBE technology to increase the laser damage resistance of fused silica optics.

scholarly journals High laser induced damage threshold photoresists for nano-imprint and 3D multi-photon lithography

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Elmina Kabouraki ◽  
Vasileia Melissinaki ◽  
Amit Yadav ◽  
Andrius Melninkaitis ◽  
Konstantina Tourlouki ◽  
...  
Keyword(s):  
Nanoimprint Lithography ◽  
Three Dimensional ◽  
Damage Threshold ◽  
Laser Pulses ◽  
Intense Laser ◽  
Optical Elements ◽  
Photonic Circuits ◽  
Future Production ◽  
Intense Laser Pulses ◽  
Laser Induced Damage

Abstract Optics manufacturing technology is predicted to play a major role in the future production of integrated photonic circuits. One of the major drawbacks in the realization of photonic circuits is the damage of optical materials by intense laser pulses. Here, we report on the preparation of a series of organic–inorganic hybrid photoresists that exhibit enhanced laser-induced damage threshold. These photoresists showed to be candidates for the fabrication of micro-optical elements (MOEs) using three-dimensional multiphoton lithography. Moreover, they demonstrate pattern ability by nanoimprint lithography, making them suitable for future mass production of MOEs.

Simulation of Large Scale KDP Crystal Polishing by Computer Controlled Micro-Nano Deliquescence

2012 ◽  
Vol 497 ◽  
pp. 165-169 ◽  
Author(s):  
He Ping Zhang ◽  
Dong Ming Guo ◽  
Xu Wang ◽  
Hang Gao
Keyword(s):  
Large Scale ◽  
Surface Condition ◽  
Single Point ◽  
Damage Threshold ◽  
Diamond Turning ◽  
Water Soluble ◽  
Optical Elements ◽  
Kdp Crystal ◽  
Computer Controlled ◽  
Laser Induced Damage

Although Single Point Diamond Turning (SPDT) can do pretty well in optical surfacing of large scale KDP crystal, both the surface accuracy and integrity are considerably high; meanwhile as the defects of micro-waveness and stress are inevitable, the laser-induced damage threshold of KDP optical elements after SPDT still cannot be satisfied. Because of the characters of deliquescent and water-soluble, the process of computer controlled Micro-nano deliquescence is attempted to remove the residual micro-waveness on KDP surface after SPDT. Based on the assumption of Preston and the characters of Micro-nano deliquescence, the model of material removal ratio is suggested, the dwell time for ascertained KDP surface is solved, the processing of computer controlled Micro-nano deliquescence is simulated and the processed surface condition on theory is obtained. Besides, the influences of different parameters on the surfacing efficiency and accuracy are analyzed. Finally, three polishing tracks are comparatively analyzed. The simulation results are quite important in guiding the experimental polishing of large scale KDP by computer controlled Micro-nano deliquescence

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

Femtosecond laser induced damage threshold (LIDT) of 3D nanolithography made micro- and nano-optical elements

2019 ◽  
Author(s):  
Agnė Butkutė ◽  
Linas Jonušauskas ◽  
Darius Gailevičius ◽  
Vygantas Mizeikis ◽  
Mangirdas Malinauskas
Keyword(s):  
Femtosecond Laser ◽  
Damage Threshold ◽  
Optical Elements ◽  
Laser Induced Damage

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 Cryogenic nanosecond and picosecond high average and peak power (HAPP) pump lasers for ultrafast applications

2016 ◽  
Vol 4 ◽  
Author(s):  
David C. Brown ◽  
Sten Tornegård ◽  
Joseph Kolis
Keyword(s):  
Thermal Effects ◽  
Peak Power ◽  
Beam Quality ◽  
Damage Threshold ◽  
Nonlinear Effects ◽  
Computer Code ◽  
Laser Systems ◽  
Laser Induced Damage ◽  
Pump Lasers ◽  
Important Design

Using cryogenic laser technology, it is now possible to design and demonstrate lasers that have concomitant high average and peak powers, with near-diffraction-limited beam quality. We refer to these new laser systems as HAPP lasers. In this paper, we review important laser crystal materials properties at cryogenic temperature, with an emphasis on Yb lasers, and discuss the important design considerations, including the laser-induced damage threshold, nonlinear effects and thermal effects. A comprehensive model is presented to describe diode pulsed pumping with arbitrary duration and repetition rate, and is used with the Frantz–Nodvik equation to describe, to first order, the performance of HAPP laser systems. A computer code with representative results is also described.

Effect of chemical modification technology laser damage threshold of fused silica optical elements

2016 ◽  
Vol 24 (12) ◽  
pp. 2956-2961
Author(s):  
袁志刚 YUAN Zhi-gang ◽  
李亚国 LI Ya-guo ◽  
陈贤华 CHEN Xian-hua ◽  
徐 曦 XU Xi ◽  
赵世杰 ZHAO Shi-jie ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Damage Threshold ◽  
Fused Silica ◽  
Laser Damage Threshold ◽  
Laser Damage ◽  
Optical Elements
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