High-efficiency nine-port beam splitting output enabled by a dielectric lamellar sandwiched fused-silica grating

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.

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High‐Efficiency and Tunable Circular‐Polarization Beam Splitting with a Liquid‐Filled All‐Metallic Catenary Meta‐Mirror

Advanced Materials Technologies ◽

10.1002/admt.201900334 ◽

2019 ◽

Vol 4 (7) ◽

pp. 1900334 ◽

Cited By ~ 3

Author(s):

Xin Xie ◽

Mingbo Pu ◽

Kaipeng Liu ◽

Xiaoliang Ma ◽

Xiong Li ◽

...

Keyword(s):

Circular Polarization ◽

High Efficiency ◽

Beam Splitting

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

MATEC Web of Conferences ◽

10.1051/matecconf/201820704004 ◽

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.

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Reflective three-port high-efficiency grating with two dielectric layers based on a sandwiched configuration

International Journal of Modern Physics B ◽

10.1142/s0217979216500727 ◽

2016 ◽

Vol 30 (12) ◽

pp. 1650072 ◽

Cited By ~ 1

Author(s):

Hongtao Li ◽

Bo Wang ◽

Hao Pei ◽

Wenhao Shu ◽

Li Chen ◽

...

Keyword(s):

High Efficiency ◽

Transverse Electric ◽

Transverse Magnetic ◽

Wave Analysis ◽

Beam Splitting ◽

Practical Applications ◽

Rigorous Coupled Wave Analysis ◽

Dielectric Layers ◽

Rigorous Coupled Wave ◽

Sandwiched Structure

In this paper, we describe a novel reflective sandwiched three-port grating with two dielectric layers. The two-layer sandwiched grating can separate incident wave into the [Formula: see text] and the 0th-order with high-efficiency beam splitting and good splitting ratios for both transverse electric (TE) and transverse magnetic (TM) polarizations. The grating parameters can be optimized by using rigorous coupled-wave analysis (RCWA) with a special duty cycle of 0.6. With the optimized results, efficiencies more than 32% in the [Formula: see text]st-orders and the 0th-order can be obtained. Furthermore, performance of the incident bandwidth and aspect ratio can be improved. Compared with conventional surface-relief grating, the grating with sandwiched structure is aimed at cleaning and protecting grating surface. The presented reflective two-layer sandwiched three-port grating would be put into practical applications for its beneficial performances.

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