Recent progress in matter in extreme states created by laser

Batani, K.; Batani, D.; He, Xuan; Shigemori, K.

doi:10.1063/5.0078895

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Introduction: High Intensity > Tw/cm 2 Crystal Processing2

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2023

2024

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Cited by 10 publications

(2 citation statements)

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“…Matter at extreme conditions of pressures above 1 megabar (10 11 Pa) and high temperatures as in the interior of planets -the warm dense matter (WDM) -is one of the active fields of research [1]. High-pressure and high-temperature phases of materials can be created by ultra-fast thermal quenching of a small modified volume inside transparent material, e.g., sapphire [2,3].…”

Section: Introduction: High Intensity > Tw/cm 2 Crystal Processingmentioning

confidence: 99%

Crystalline Flat Surface Recovered by High Temperature Annealing after Laser Ablation

Smith¹,

Ng²,

Katkus³

et al. 2023

Preprint

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Section: Introduction: High Intensity > Tw/cm 2 Crystal Processingmentioning

confidence: 99%

Crystalline Flat Surface Recovered by High Temperature Annealing after Laser Ablation

Smith¹,

Ng²,

Katkus³

et al. 2023

Preprint

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“…Matter at extreme conditions of pressures above 1 megabar (10 11 Pa) and high temperatures as in the interior of planets-the warm dense matter (WDM)-is an active field of research [1]. High-pressure and high-temperature phases of materials can be created by ultra-fast thermal quenching of a small modified volume inside transparent material, e.g., sapphire [2,3].…”

Section: Introduction: High Intensity > Tw/cm 2 Crystal Processingmentioning

confidence: 99%

Crystalline Flat Surface Recovered by High-Temperature Annealing after Laser Ablation

Smith

Tang

et al. 2023

Photonics

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Ultra-short laser pulses (1030 nm/230 fs) were used to laser ablate the surface of crystalline sapphire (Al2O3) at high intensity per pulse 20–200 TW/cm2/pulse. Laser-ablated patterns were annealed at a high temperature of 1500 °C. Surface reconstruction took place, removing the ablation debris field at the edges of ablated pits in oxygen flow (O2 flow). Partial reconstruction of ripples was also observed when multi-pulse ablated surfaces were annealed at high temperature in O2 flow. Back-side ablation of a 0.5-mm-thick Al2O3 produced high surface roughness ∼1μm which was reduced to ∼0.2μm by high-temperature annealing at 1500 °C for 2 h in O2. Improvement of surface quality was due to restructuring of the crystalline surface and sublimation, while the defined 3D shape of a micro-lens was not altered after HTA (no thermal morphing).

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