Ultra-short pulse generation and its interaction with matter

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(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.