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首页> 外文期刊>Physica, B. Condensed Matter >Lattice dynamics in two-photon-excited US studied by picosecond time-resolved X-ray diffraction
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Lattice dynamics in two-photon-excited US studied by picosecond time-resolved X-ray diffraction

机译：皮秒时间分辨X射线衍射研究双光子激发US中的晶格动力学

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摘要

Lattice dynamics and radiative processes in single-crystal cadmium sulfide induced by two-photon excitation with a femtosecond laser are investigated. The development of lattice expansion is directly observed by picosecond time-resolved X-ray diffraction. The obtained lattice dynamics are explained on the basis of a thermally induced impulsive-strain model. The model calculation indicates that two- and more-photon absorption processes occur and that reflectivity rapidly increases under laser irradiation. In photoluminescence spectroscopy, the spectra for TW cm(-2) excitation are shifted to lower energy and show an additional shoulder at 2.35 eV. Furthermore, emission due to Fabry-Perot laser modes with self-formed cavities was observed under I I TW cm(-2) excitation. The discrepancy between carrier densities deduced from the lattice expansion and the PL spectra indicates that the predominant process at a higher carrier density is not radiative recombination, but Auger recombination followed by lattice heating. (C) 2008 Elsevier B.V. All rights reserved.
机译：研究了飞秒激光在双光子激发下单晶硫化镉的晶格动力学和辐射过程。通过皮秒时间分辨X射线衍射可直接观察到晶格膨胀的发展。在热诱导脉冲应变模型的基础上解释了获得的晶格动力学。模型计算表明，发生了两次以上的光子吸收过程，并且在激光照射下反射率迅速增加。在光致发光光谱中，TW cm（-2）激发的光谱被转移到较低的能量，并在2.35 eV处显示出额外的肩峰。此外，由于在I TW cm（-2）激发下观察到由于具有自形成腔的Fabry-Perot激光模式而产生的发射。由晶格扩展和PL光谱得出的载流子密度之间的差异表明，在较高载流子密度下的主要过程不是辐射重组，而是俄歇重组然后是晶格加热。 （C）2008 Elsevier B.V.保留所有权利。

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