Generation of Multi-Color Ultimately-short Optical Pulse and Its Application to the-State-of-the-Art Modern Technology

点击翻译按钮获取中文摘要

1.Verification of Phase-Locking in the Process of Two-Color Stimulated Raman ScatteringWe observed four rotational Raman lines using a 100-fs laser pulse as an input beam. The output beam had a duration of 30 fs, indicating that the phases are locked each other among those Raman limes. In, addition, we demonstrated another approach for pulse compression of a near-ultraviolet femtosecond pulse by probing coherent molecular motion in the process of transient stimulated Raman scattering induced by a near-infrared femtosecond laser.2.Generation of a Train of Highly-Repetitive Ultrashort PulsesWe observed continuous-wave (CW) high-order rotational Raman lines from ortho-hydrogen using a pressurized high-finesse optical resonator pumped by a CW Ti : Sapphire laser with an output power of 200 mW. We measured the temporal profile of the output beam using a laboratory-made autocorrelator, which is based on two-photon absorption of an electrode in a photomultiplier tube, showing a beat waveform … More consisting of sinusoidal modulation at a frequency of 17 THz. To our knowledge, this is the fastest light-intensity modulator. For this reason, we named it "molecular optic-modulator".3.Generation of a High-Peak-Power Ultrashort Optical PulseWe demonstrated the generation of a 17-fs optical pulse using two cells sequentially-aligned. We also showed that deuterium cooled by liquid nitrogen was useful as a Raman medium for a high-power pump pulse with a duration large than 100 fs.4.Application of Multi-Color Ultrashort Laser to Education and ResearchIn the design curriculum for students in a freshman course, we conducted a practical training for the students to fabricate the multi-color laser display using a rainbow-color laser, referred to as "Rainbow Stars." In addition, we made a contract with a company to provide the patent and to commercialize this multi-color laser system. For scientific application, we examined X-ray spectroscopy and trace analysis of dioxin compounds in the environment based on multiphoton ionization/mass spectrometry (MPI/MS). We reported that this approach (MPI/MS) had a comparable detection limit (〜0.6 pg) to that determined by JIS. Less