Ultra-short pulse generation and its interaction with matter

(1)超短脉冲的产生：利用光子晶体光纤对NOPA输出脉冲的载波包络相位（CEP）自稳定性进行了评估，并证实了其稳定性。还用光谱干涉的方法评价了两个NOPA系统输出的互稳性。利用两个NOPA系统构建了一个新的泵浦探测光谱系统。(2)超短脉冲表征方法的发展：测量了超短脉冲的CEP。传统的圆极化误差测量方法局限于使用强激光场。一种新的方法使我们能够测量任意强度脉冲的CEP。利用OPA产生了具有固定CEP的超短脉冲，并成功地将脉冲起伏稳定到π/10。利用CEP控制的激光系统，建立了CEP光学极化实验。诱导的分子取向被证明是由CEP控制，这是与理论预测一致。(3)瞬态光谱学（Real-time Spectroscopy of Molecular Vibration）：建立了分子体系（如聚二乙炔、一维共轭多烯体系、异氰脲J-聚集体、酞菁、卟啉及其金属化合物）的电子振动耦合的实时动力学。

(1) Generation of ultra-short pulse: Carrier envelope phase (CEP) selfstabilization of the NOPA output pulse was evaluated with the photonic crystal fiber, and its stability was confirmed. inter-stabilization of outputs of two NOPA systems was also evaluated by means of spectral interference. Anew spectroscopy system for pump-probe measurement with two NOPA systems was constructed.(2) Development of ultra-short pulse characterization method: CEP of the ultra-short pulse was measured. Conventional method of CEP measurement is limited on the use of extremely intense laser field. A newly developed method has enabled us to measure the CEP of pulse with arbitrary intensity. Ultra-short pulse with a fixed CEP was generated by means of OPA, and fluctuation was stabilized successfully asmuch as π/10. Using the CEP-controlled laser system, a CEP optical poling experiment was established. Induced molecular orientation was shown to be controlled by the CEP, which was consistent with theoretical prediction.(3) Transient-state spectroscopy (Real-time spectroscopy of molecular vibration): Real-time dynamics of vibronic coupling of molecular system, such as polydiacetylene, one-dimensional system of conjugated polyene, isocyanine J-aggregate, phthalocyanine, porphyrin and its metallic compound, was established.