研究目的
Investigating the dependence of the generated peak temperature Tmax on the pulse duration after absorption of a laser pulse in an opaque medium.
研究成果
The study identifies three regimes of heat diffusion after laser excitation where the generated peak temperature Tmax depends differently on the pulse duration. It introduces a parameter τ? that depends on material constants and the duration of the excitation pulse to assess heat transport conditions. The findings are supported by numerical simulations and experimental data.
研究不足
The study does not apply multitemperature models for ultrashort time scales (optical pulses shorter than 1 ps) and neglects convection and radiative heat exchange.
1：Experimental Design and Method Selection:
The study uses the phenomenological theory of heat diffusion and numerical simulations to analyze heat diffusion dynamics.
2：Sample Selection and Data Sources:
The experiments involve bulk platinum (Pt) and a thin film heterostructure sample consisting of LaAlO3 (LAO), La
3：7Sr3MnO3 (LSMO), and NdGaO3 (NGO). List of Experimental Equipment and Materials:
The setup includes a commercial Ti:Sapphire laser system (Legend, Coherent Inc.) for optical excitation and time-resolved x-ray diffraction for detecting transient lattice temperature.
4：Experimental Procedures and Operational Workflow:
The study measures the thermal surface expansion after transient grating excitation with 1 ps and 10 ns optical pulses.
5：Data Analysis Methods:
The data is analyzed using finite element method (FEM) solver COMSOL for numerical simulations of heat diffusion.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
