A Study on Dynamics in Organic Crystals Using THz-Repetition-Rate-Controlled Femtosecond Spectroscopy

利用太赫兹重复率控制飞秒光谱研究有机晶体动力学

• 批准号: 06452124
• 负责人: YAMASHITA Mikio
• 金额: $ 4.54万
• 依托单位: HOKKAIDO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06452124/
• 关键词: femtosecond optical pulse shaping; femtosecond time-division interferometer; nonlinear refractive index; pump-prope configuration; intermolecular interaction; フェムト秒光パルス波形整形; フェムト秒時間分解干渉計; 非線形屈折率; ポンプ・プローブ法; 分子間相互作用; ソリトンパルス圧縮; フェムト秒時間分解4光波分光

The purpose of the present study is to develop a method for controlling quantum states in condensed matters using THz-repetition-rate optical pulses and to find suitable materials effectively controlled. Results of our study are summarized as follows.1. An approach for generation of an ultrabroad-band optical pulse (550 THz width) is proposed, which is based on mutual induced phase modulation of three synchronized femtosecond pulses in a short fiber. These pulses having equidistant carrier frequencies and constant carrier-phase differences are obtained from the fundamental, the second-harmonic and the second-harmonic-pulse pumped parametric waves. Computer analysis shows that chirp of the composite wave at the fiber output can be compensated for by a spatial phase modulator and a 1.76-cycle pulse is generated.2. We built up a optical pulse shaping system consisting of a femtosecond Ti : sapphire laser, a Fourier-transformation unit, a pair of gratings and a spatial phase modulator. 2.0 … More 6 THz-repetition-rate optical pulses were generated.3. Using a femtosecond time-resolved four-wave mixing spectroscopic system, we first determined the third-order optical susceptibilities of 1- (3-thienyl) -3- (4-chlorophenyl) propen-1-one crystal and solution. We also found that their optical nonlinearities respond within 80 fs.4. From a femtosecond time-resolved, optically-heterodyne detected optical Kerr measurement, it was found that carotenoid solutions have effectively negative third-order nonlinearities responding femtosecond optical pulses. And it was shown that these nonlinearities are due to a two-photon process.5. Picosecond time-resolved emission spectra of guanine (G), guanosine (GS) and guanosine 5'-monophosphate (GMP) were measured with a few picosecond time resolution in neutral-acidic aqueous solutions by use of a femtosecond UV pulse laser and a highly sensitive streak camera. It was found that each emission consists of a fast decaying and a slow decaying components which are from monomers and protonated cation molecules, respectively. Less

本研究的目的是开发一种使用太赫兹重复率光脉冲控制凝聚态量子态的方法，并找到有效控制的合适材料。本研究的主要结果如下：1.提出了一种基于短光纤中三个同步飞秒脉冲相互感应相位调制产生超宽带光脉冲（550 THz宽度）的方法。这些脉冲具有等载波频率和恒定的载波相位差，从基波，二次谐波和二次谐波脉冲泵浦的参量波获得。计算机分析表明，空间相位调制器可以补偿光纤输出端复合波的啁啾，并产生1.76周期的脉冲.利用飞秒钛宝石激光器、傅里叶变换单元、一对光栅和空间相位调制器组成了光脉冲整形系统。2.0 ...更多信息 产生了6个重复频率的太赫兹光脉冲.利用飞秒时间分辨四波混频光谱系统，我们首先测定了1-（3-噻吩基）-3-（4-氯苯基）丙烯-1-酮晶体和溶液的三阶光学极化率。我们还发现，它们的光学非线性响应在80 fs。从飞秒时间分辨，光外差检测的光学克尔测量，它被发现类胡萝卜素的解决方案，有效地响应飞秒光脉冲的负三阶非线性。结果表明，这种非线性是由双光子过程引起的.利用飞秒紫外脉冲激光器和高灵敏度条纹相机，测量了鸟嘌呤（G）、鸟苷（GS）和鸟苷5'-磷酸（GMP）在中性-酸性水溶液中的皮秒时间分辨发射光谱。结果发现，每个发射包括一个快速衰减和一个缓慢衰减的成分，这是从单体和质子化的阳离子分子，分别。少

项目成果

Y.Yamaoka et al.: "Dynamics of third-order nonlinearity of nonresonant organic solutions by femtosecond pump-probe spectroscopy" Nonlinear Optics. 15. 61-64 (1996)

Y.Yamaoka 等人：“通过飞秒泵浦探针光谱研究非共振有机溶液的三阶非线性动力学”非线性光学。

T.Fujiwara et al.: "Excited-state studies of guanine and its derivatives in aqueous solutions by picosecond time-resolved emission spectroscopy" Technical Digest of CLEO'96. 154-155 (1996)

T.Fujiwara 等人：“通过皮秒时间分辨发射光谱对水溶液中的鸟嘌呤及其衍生物进行激发态研究”CLEO96 的技术文摘。

T. Itoh et al.: "Extremely Fast-Response, Highly Nonlinear Doped-Silica Single-Mode Fibers" Jpn. J. Appl. Phys.35. L1107-L1110 (1996)

T. Itoh 等人：“极快响应、高度非线性掺杂二氧化硅单模光纤”Jpn。

R.Morita et al.: "Femtosecond negative Kerr-response due to a two-photon process in β,β-carotene solutions" Technical Digest of QELS'96. 57-58 (1996)

R.Morita 等人：“由于 β,β-胡萝卜素溶液中的双光子过程导致飞秒负克尔响应”QELS96 技术文摘 (1996)。

Y. Sato et al.: "Ultrafast Dynamic Behaviors of Different Nonlinear Refractive Index Components in CS_2 Using a Femtosecond Interferometer" Jpn. J. Appl. Phys.36(in press). (1997)

Y. Sato 等人：“使用飞秒干涉仪在 CS_2 中不同非线性折射率分量的超快动态行为”Jpn。