High efficiency broadband polarizationindependent binary fused silica gratings forlarge astronomical telescopes

2021 ◽  
Author(s):  
Yanan Wang ◽  
Zhiwen Chen ◽  
Maoqi Cai ◽  
Keqiang Qiu ◽  
Zhengkun Liu ◽  
...  
Keyword(s):  
High Efficiency ◽  
Fused Silica

Indentation Crack Initiation and Ductile to Brittle Transition Behavior of Fused Silica

2013 ◽  
Vol 797 ◽  
pp. 667-672 ◽  
Author(s):  
Peng Yao ◽  
Wei Wang ◽  
Chuan Zhen Huang ◽  
Jun Wang ◽  
Hong Tao Zhu ◽  
...  
Keyword(s):  
Penetration Depth ◽  
High Efficiency ◽  
Fused Silica ◽  
Load Range ◽  
Brittle Transition ◽  
Ductile Mode ◽  
Indentation Crack ◽  
Ultra Precision ◽  
Ductile To Brittle Transition ◽  
Brittle Mode

To provide a fundamental knowledge for the high efficiency grinding and ultra-precision grinding of fused silica, ductile mode and brittle mode material removal mechanisms were investigated by conducting micro/nanoindentation experiments in the range of 4.9 mN - 1960 mN. Before observing cracks and determining the ductile to brittle transition penetration depth, the samples were etched with hydrofluoric acid to expose cracks. The typical damage morphology of fused silica was discussed by observing the surface and cross-section of indentations, and the depth of SSD was found to be determined by the cone cracks or borderline cracks in the different load range. The ductile to brittle transition penetration depth of fused silica under Vickers indentation was 180 nm.

scholarly journals Problems of sodium using in pulsating heat pipe made from fused silica

2018 ◽  
Vol 207 ◽  
pp. 04004
Author(s):  
Radovan Nosek ◽  
Tatiana Liptáková ◽  
Libor Trško ◽  
Zuzana Kolková ◽  
Milan Malcho ◽  
...  
Keyword(s):  
High Temperature ◽  
Heat Pipe ◽  
Alkali Metals ◽  
High Efficiency ◽  
Fused Silica ◽  
Operating Conditions ◽  
Liquid Sodium ◽  
Working Fluid ◽  
Pulsating Heat Pipe ◽  
High Temperature Reaction

You Heat pipe is a high efficiency heat transfer element, depends on the evaporation, condensation and circulation of inside working fluid. The working fluid of a high temperature pulsating heat pipe is generally alkali metals, and sodium heat pipe can operate in range of 500-1100°C. In order to investigate terminal velocity of working fluid, the glass pulsating heat pipe was produced for experimental purposes. The experiment was carried out, in order to simulate real operating conditions in range of 500-1100°C. Sudden boiling of liquid sodium (b.p. = 883°C at 1 atm) inside the all quartz-made heat pipe results in high-temperature reaction of sodium vapour with the inner wall surface. The reaction became more aggressive with increasing vapour temperature and resulted in heat pipe explosion. The evaluation of damage character is analysed in this paper.

High-efficiency trace Na extraction from crystal quartz ore used for fused silica — A pretreatment technology

2017 ◽  
Vol 24 (10) ◽  
pp. 1075-1086 ◽  
Author(s):  
Min Lin ◽  
Zhen-yu Pei ◽  
Yuan-yuan Liu ◽  
Zhang-jie Xia ◽  
Kang Xiong ◽  
...  
Keyword(s):  
High Efficiency ◽  
Fused Silica ◽  
Crystal Quartz ◽  
Pretreatment Technology

scholarly journals Generation of three-port splitter by double-layer grating in second-order Littrow configuration

2020 ◽  
Vol 50 (2) ◽  
Author(s):  
Chenhao Gao ◽  
Bo Wang ◽  
Chen Fu ◽  
Jimin Fang_ ◽  
Kunhua Wen ◽  
...  
Keyword(s):  
Double Layer ◽  
Beam Splitter ◽  
High Efficiency ◽  
Single Layer ◽  
Fused Silica ◽  
Second Order ◽  
Grating Structure ◽  
Grating Region ◽  
Fabrication Tolerance ◽  
Littrow Configuration

In this paper, a novel double-layer three-port grating is described. The incident grating structure is in the second-order Littrow configuration. The grating region is composed of fused silica and Ta2O5. The designed grating beam splitter has high efficiency under TE polarization and TM polarization, respectively. The efficiency of two polarizations is more than 90%. In addition, compared with a single-layer three-port grating, this new beam splitter has good fabrication tolerance and incident bandwidth. Therefore, the optimized structure has a good application value.

Polarization-independent triangular-groove fused-silica gratings with high efficiency at a wavelength of 1550nm

2010 ◽  
Vol 283 (21) ◽  
pp. 4271-4273 ◽  
Author(s):  
Hongchao Cao ◽  
Changhe Zhou ◽  
Jijun Feng ◽  
Peng Lv ◽  
Jianyong Ma
Keyword(s):  
High Efficiency ◽  
Fused Silica ◽  
Polarization Independent

A high-efficiency three-dimensional helical micromixer in fused silica

2012 ◽  
Vol 19 (7) ◽  
pp. 1033-1040 ◽  
Author(s):  
Keyin Liu ◽  
Qing Yang ◽  
Shengguan He ◽  
Feng Chen ◽  
Yulong Zhao ◽  
...  
Keyword(s):  
High Efficiency ◽  
Three Dimensional ◽  
Fused Silica
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