Nonlinear spatio-temporal photonicswith tera optical pulse

本研究的目的是与Venture Business Laboratory和COE Osaka合作，利用超短激光脉冲建立非线性时空光子学的光学技术。本课题的研究成果如下：自陷折射率变化的诱导利用飞秒激光脉冲（800 nm）聚焦到石英玻璃中形成的细丝，诱导折射率变化。折射率变化区的直径约为2 μ m，长度为几十到几百mm，最大折射率变化为0.01。空洞的光学俘获和梅林利用高NA物镜对超短激光脉冲进行聚焦，在玻璃内部形成空洞。通过重复超短激光脉冲的照射和聚焦透镜的平移，我们成功地使空隙沿光轴沿着移动约5微米。我们还成功地将两个空洞合二为一。光谱层析我们建立了一个非色散和色散相干光谱层析系统，同时测量物体内部的空间和光谱信息。通过对虾类样品的检测，对色散相干层析成像系统进行了评价。我们成功地获得了清晰的光谱层析图像的虾尾。超快时空信息处理我们演示了超快光学路由的基本功能，通过使用超快光学技术的一个基本部分，用于时间到二维空间的转换。初步实验结果表明，该系统可以实现600 Gbytes/s以上的信头信号识别。

The purpose of this research was to establish the optical technology of nonlinear spatio-temporal photonics with ultrashort laser pulses in collaboration with Venture Business Laboratory and COE Osaka. "Development of basic tera optical information technologies" The results obtained in the research term are listed below.Induction of refractive index change by self-trapped filamentsWe induced the refractive index change by using the filaments formed by femtosecond laser pulses (800nm) focused into silica glass. The diameter of the area of refractive index change was approximately 2 microns and the length was several ten toseveral hundred mm. The maximum refractive index change was 0.01.Optical seizing and mering of voidsWe focused the ultrashort laser pulses by high-NA objectives and formed voids inside glass. We succeeded in moving the void by approximately 5 microns along the optical axis by repeating the irradiation of the ultrashort laser pulse and translation of the focusing lens. We also succeeded in merging the two voids into one.SpectrotomographyWe built a non-dispersive and a dispersive coherence spectrotomography systems that measure simultaneously the spatial and spectral information inside the object. The dispersive coherence spectrotomograpy system was evaluated by applying the system to small shrimps. We succeeded in obtaining clear spectrotomography image of the tail of shrimp.Ultrafast spatio-temporal information processingWe demonstrate fundamental functions for ultrafast optical routing by using an elemental part of an ultrafast optical technique for conversion of time to two-dimensional space. A preliminary experimental result shows that recognition of header signals can be achieved at a rate of more than 600 Gbytes/s.