Modeling the effects of crystallite alignment on birefringent light scattering in transparent polycrystalline aluminum oxide DOI
Wenbo Zhou, Meir H. Shachar, Javier E. Garay

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(18)

Published: Oct. 28, 2024

Transparent alumina ceramics are known for high toughness and the ability to withstand temperatures, making them ideal materials use in extreme environments high-power optical devices. However, polycrystalline alumina, which has a hexagonal crystal structure, is difficult make highly transparent due birefringent scattering loss. Research shown that can be reduced by having finer grains and/or aligned grains. Here, we present an analytical birefringence model realistic microstructures, including chord length distributions grain orientations, predict loss quantitatively. Our modeled results match well with existing experimental data fine grained alumina. This derived from first-principles applicable other ceramics.

Language: Английский

Ultrafast, High-Intensity Laser Material Interaction in Polycrystalline Alumina Transparent Ceramics DOI

Poh Yin Chong,

Xing Wu, Gabriel R. Castillo

et al.

Published: Jan. 1, 2025

High-intensity pulsed laser-material interaction is a complicated process involving various laser parameters and material properties, the coupling of these factors affects modifications. This study investigates interactions single-crystal alumina (SCA) transparent polycrystalline (PCA). To understand underlying mechanism laser-induced modifications, single-shot irradiations are conducted using an ultrafast ([[EQUATION]], [[EQUATION]]). experiment focuses on high-intensity regime from 1012 W/cm2 to 1015 W/cm2, generating high temperatures pressure causing modifications (melting, ablation, fracture). While SCA PCA fundamentally Al2O3, difference in microstructure alters optical mechanical properties. The ablation depth shows sublinear power law relationship with intensity for both materials although energy dependence lower PCA. differences can be attributed different damage mechanisms; craters exhibit predominantly melting whereas demonstrates fracture-like morphologies. fracture surprising given its higher indent-produced resistance. behavior reconciled considering much application rates produced by pulsing. has threshold (LIDT) than SCA. Laser-induced crater area volume increase linearly fluence peak intensity. Altering focusing conditions change LIDT expand processing window.

Language: Английский

Citations

0
Al2O3陶瓷材料飞秒激光加工损伤分子动力学模拟 DOI

谢丽娴 Xie Lixian,

高延峰 Gao Yanfeng,

张华 Zhang Hua

et al.

Laser & Optoelectronics Progress, Journal Year: 2025, Volume and Issue: 62(5), P. 0514002 - 0514002

Published: Jan. 1, 2025

Citations

0
Modeling the effects of crystallite alignment on birefringent light scattering in transparent polycrystalline aluminum oxide DOI
Wenbo Zhou, Meir H. Shachar, Javier E. Garay

et al.

Applied Physics Letters, Journal Year: 2024, Volume and Issue: 125(18)

Published: Oct. 28, 2024

Transparent alumina ceramics are known for high toughness and the ability to withstand temperatures, making them ideal materials use in extreme environments high-power optical devices. However, polycrystalline alumina, which has a hexagonal crystal structure, is difficult make highly transparent due birefringent scattering loss. Research shown that can be reduced by having finer grains and/or aligned grains. Here, we present an analytical birefringence model realistic microstructures, including chord length distributions grain orientations, predict loss quantitatively. Our modeled results match well with existing experimental data fine grained alumina. This derived from first-principles applicable other ceramics.

Language: Английский

Citations

1