Study of ultrafast relaxation dynamics of localized center in solids by femtosecond Raman spectroscopy
Study of ultrafast relaxation dynamics of localized center in solids by femtosecond Raman spectroscopy
批准号:
03452037
负责人:
NAKAMURA Arao
金额:
$4.48万
依托单位:
依托单位国家:
日本
项目类别:
Grant-in-Aid for General Scientific Research (B)
财政年份:
1991
资助国家:
日本
项目状态:
已结题
起止时间:
1991 至 1992
中文摘要
1)飞秒激光系统的安装:我们安装了一个高功率飞秒激光系统,该系统提供波长为600和300 nm的泵浦脉冲,在400至950 nm光谱范围内具有白色连续谱的探测脉冲,脉冲持续时间为100 fs。2)碱金属卤化物中的飞秒非线性光谱:a)我们发现KBr中F中心的绝热势能面(APES)上的弛豫过程是动态的,发生在100 fs以内。B)在KBr中F心的形成过程中,F心的形成先于空穴的自陷,F心的弛豫发生在中心型自陷激子(STE)上。c)我们首次观察到了KI中最低APES上STE作为两个极小值之间的波斑的振荡。d)在碱金属碘化物(KI和RbT)中,自由空穴首先转变为单中心自陷空穴,然后形成双中心自陷空穴(V_k中心)。此外,激子自陷的初始阶段不是由类V_k中心和自由电子组成,而是由与电子相关的单中心自陷空穴组成,这是形成STE的先驱态之一。3)ZnTe:O的飞秒非线性光谱:我们观察到了束缚激子的弛豫过程以及与声子的中间耦合。激子-晶格弛豫与LO声子的发射有关,并与LO声子的周期有关。
英文摘要
1)Installation of a femtosecond laser system.We installed a high power femtosecond laser system which provided pumping pulses with wavelengths of 600 and 300 nm,probe pulses with a white continuum in the spectral range of 400 to 950 nm and a pulse duration of 100 fs.2) Femtosecond nonlinear spectroscopy in alkali halides:a) We found that the relaxation process on the adiabatic potential energy surface (APES) of F center in KBr is dynamical and occurs within 100 fs. b) In the formation processes of F center in KBr, an F center is formed before the self-trapping of a hole and the F center relaxation occurs from the on-center type self-trapped exciton (STE). c) We observed for the first time the oscillation of the STE as a wavepaquet between two minima on the lowest APES in KI. d) In alkali iodides (KI and RbT) a free hole is first converted to a one-center self-trapped hole and subsequently a two-center self-trapped hole (V_k center) is formed. Furthermore, the initial stage of self-trapping of a exciton does not consist of a V_k-like center and a free electron but a one-center self-trapped hole correlated with an electron is one of the precursor states for the STE formation. These are the first experimental finding of the initial processes of the self-trapping.3) Femtosecond nonlinear spectroscopy in ZnTe:O: We observed the relaxation processes of bound excitons with the intermediate coupling with phonons. The exciton-lattice relaxation with emission of LO phononsoccurs with a period of the LO phonon.
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4) S. Iwai, T. Tokizaki, a. Nakamura, T. Shibata, K. Tanimura and N. Itoh: "Femtosecond spectroscopy of self-trapping processes of holes and exitons in alkali halides." J. Luminescence. (1993)
4)S. Iwai,T. Tokizaki,a。
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通讯作者:
T.Tokizaki: "Ultrafast Formation Processes of Self-Trapped Excitons in Alkali Crystals under Band-to-Band Excitation" Ultrast Phenomena VIII. (1992)
T.Tokizaki:“带间激发下碱晶体中自陷激子的超快形成过程”Ultrast Phenomena VIII。
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通讯作者:
A.Nakamuram,T.Tokizaki: "Ultrafast optical nonlinearity of semiconducting microcrystallites in glass matrices" Proceedings of Toyota conference on nonlinear optical materials. (1992)
A.Nakamuram,T.Tokizaki:“玻璃基体中半导体微晶的超快光学非线性”丰田非线性光学材料会议记录。
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通讯作者:
T.Tokizaki: "Femtosecond Cascade-Excitation Spectroscopy for Nonradiative Deexcitation and Lattice Relaxation of the Self-Trapped Exciton in NaCl" Physical Review Letters. 67. 2701-2704 (1991)
T.Tokizaki:“用于氯化钠中自陷激子的非辐射去激发和晶格弛豫的飞秒级联激发光谱”物理评论快报。
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共 13 条
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