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

1.双色受激拉曼散射过程中锁相的验证我们用100fs的激光脉冲作为入射光束，观察到了四条旋转的拉曼线。输出光束的持续时间为30fS，这表明在这些拉曼光谱中，相位是相互锁定的。此外，我们还展示了另一种通过探测近红外飞秒激光诱导的瞬时受激拉曼散射过程中的相干分子运动来压缩近紫外飞秒脉冲的方法。2.产生高重复频率的超短脉冲串。我们利用加压高精细光学谐振腔观察到了由200 mW的连续钛宝石激光泵浦的正氢高阶旋转拉曼线。我们使用实验室自制的自相关器测量了输出光束的时间分布，该自相关器基于光电倍增管中电极的双光子吸收，显示出拍频波形…更多的是由频率为17太赫兹的正弦调制组成。据我们所知，这是最快的光强度调制器。3.高峰值功率超短光脉冲的产生我们演示了用两个连续排列的单元产生17fs光脉冲。我们还表明，液氮冷却的氘作为高功率泵浦脉冲的拉曼介质是有用的，脉冲宽度超过100秒。4.多色超短激光在教育和研究中的应用在一门新生课程的设计课程中，我们对学生进行了使用彩虹色激光制作多色激光显示器的实践培训，称为“彩虹之星”。此外，我们还与一家公司签订了一项合同，提供专利并将这种多色激光系统商业化。为了科学应用，我们基于多光子电离/质谱仪(MPI/MS)对环境中的二恶英化合物进行了X射线光谱分析和痕量分析。我们报道，这种方法(MPI/MS)具有与JIS测定的类似的检出限(~0.6pg)。较少

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