Phase-sensitive femtosecond time-resolved four-wave mixing with spatial light modulators

相敏飞秒时间分辨四波混频与空间光调制器

• 批准号: 09640593
• 负责人: HATTORI Toshiaki
• 金额: $ 2.11万
• 依托单位: University of Tsukuba
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09640593/
• 关键词: spatial light modulator; liquid crystal; pulse shaping; simulated annealing; GaAsP photodiode; two-photon-induced photocurrent; Ga^-As^+Pフォトダイオード; フェムト秒; 四光波混合; チタンサファイア; 液晶ディスプレイ

Phase-sensitive femtosecond pulse shaping apparatus has been constructed using a liquid crystal spatial light modulator (SLM) with is commercialized for use in projectors. The SLM was an active-matrix TFT twisted nematic liquid crystal SLM with 640x 480 pixels, each of which can be controlled independently by a personal computer in 256 greyscale. A Michelson interferometer was built for the measurement of the amplitude and phase change of the light transmitted through the SLM at each of the 256 levels. Mask patterns and the generated waveforms were calculated by a newly written simulated annealing computer program which incorporated the experimentally obtained amplitude-phase relation. An interferometric cross-correlation measurement apparatus was constructed which used two-photon-induced current in a GaAsP photodiode. God quality of data was obtained when the path length was modulated by a piezo-electric actuator. Another cross-correlation measurement technique using two- photon-induced photocurrent in a photomultiplier tube has also been developed. Measurements of the generated waveforms using the technique described above have confirmed the ability of the constructed pulse shaping apparatus. Phase control of the generated waveforms was also performed.

利用液晶空间光调制器（SLM）实现了相敏飞秒脉冲整形装置，该装置已商业化用于投影仪。SLM是具有640 × 480像素的有源矩阵TFT扭曲的液晶SLM，每个像素可以由个人计算机以256灰度独立控制。建立了迈克尔逊干涉仪，用于测量在256级中的每一级上透射通过SLM的光的振幅和相位变化。掩模图案和所产生的波形由新编写的模拟退火计算机程序计算，该程序结合了实验获得的幅相关系。利用GaAsP光电二极管中的双光子感应电流，建立了一种干涉互相关测量装置。当用压电作动器调制光程长度时，获得了高质量的数据。本文还提出了利用光电倍增管中双光子感生光电流的互相关测量技术。使用上述技术对所产生的波形的测量已经证实了所构造的脉冲整形设备的能力。还对所产生的波形进行相位控制。

项目成果

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H.Nakatsuka: "Linear propagation of glass transition:Time-resolved fluorescence measurements of doped dye molecules"Prog. Theor. Phys. Suppl. 126. 433-436 (1997)

H.Nakatsuka：“玻璃化转变的线性传播：掺杂染料分子的时间分辨荧光测量”Prog。

J.Y.Ye: "Microscopic dynamics of the glass transition investigated by time-resolved fluorescence measurements of doped chromophores"Phys.Rev.B.. 56. 5286-5296 (1997)

J.Y.Ye：“通过掺杂发色团的时间分辨荧光测量研究玻璃化转变的微观动力学”Phys.Rev.B.. 56. 5286-5296 (1997)

R.M.Koehl et al.: "Automated spatial and temporal shaping of femtosecond pulses" Opt.Commun.157 (1-6). 57-61 (1998)

R.M.Koehl 等人：“飞秒脉冲的自动空间和时间整形”Opt.Commun.157 (1-6)。

T.Fuji: "A white-light Michelson interferometer in the visible and near infrared regions"Rev.Sci.Instr.. 69. 2854-2858 (1998)

T.Fuji：“可见光和近红外区域的白光迈克尔逊干涉仪”Rev.Sci.Instr.. 69. 2854-2858 (1998)