Three-dimensional microphotonic optical systems

三维微光子光学系统

• 批准号: 10450026
• 负责人: ITOH Kazuyoshi
• 金额: $ 9.02万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B).
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450026/
• 关键词: Ultrashort laser pulse; Micromachining; Glass; Photo-induced refractive-index change; Self-trapped filament; Waveguide; Void; Birefringence; シリカガラス; 光損傷; 多光子吸収

The purpose of this research was 1) the investigation of the mechanism of refractive index changes in photorefractive crystal and Ge-doped silica glass that are induced by ultrashort laser pulses and and 2) fabrication and evaluation of microstructures inside glass such as the waveguides, dividers, couplers and small Bragg reflectors. The results obtained in the research term are listed below.1) Induction of refractive index change by self-trapped filamentsWe induced the refractive index change by using the filaments formed by femtosecond laser pulses (800 nm) focused into the silica glass. The diameter of the area of refractive index change was approximately 2μm and the length was several ten to several hundred mm. The maximum refractive index change was 0.01.2) Fabrication of birefringent microphotonic elementsBy mechanically translating the filament formed by the ultrashort laser pulses, we fabricated optical waveguides with negligible loss (core diameter ; 2μm, length ; 2 mm). We f … More ound that the waveguides had birefringence and evaluated the birefringence by making a grating with these waveguides.3) Optical seizing and mering of voidsWe focused the ultrashort laser pulses by high-NA objectives and formed voids inside glass. We cleaved the glass inside which voids are formed and observed the void by scanning electron-beam microscope. We identified the voids as the vacancies inside the glass. We succeeded in moving the void by approximately 5μm 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.These results do not unfortunately lead to the direct elucidation of the mechanism. However, they provide strong clues to the interpretation of the mechanism of refractive index change in silica glass.A part of this work has been published in Optics Letters and is under preparation for publication. Two patents related to the movement and merger of voids and formation of birefringent optical waveguides are under application by the help of Japan Science and Technology Corporation. The results of movement and merger of voids are picked up by the technical magazine, Laser Focus World (Vol.37, Issue 2, 2001). Less

本论文的主要目的是：1）研究超短激光脉冲在光折变晶体和掺锗石英玻璃中引起折射率变化的机理; 2）在玻璃内部制作微结构，如波导、分波器、耦合器和小布拉格反射器。1）自陷效应诱导折射率变化我们利用飞秒激光脉冲（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2μm，长度为几十到几百mm，最大折射率变化为0.01。2）双折射微光子器件的制备通过机械平移超短激光脉冲形成的细丝，制备了损耗可忽略的光波导（芯径2μm，长2 mm）。我们f ...更多信息 发现波导具有双折射，并通过用这些波导制作光栅来评估双折射。3）光学捕获和空洞的形成我们用高NA物镜聚焦超短激光脉冲，并在玻璃中形成空洞。我们将内部形成空隙的玻璃劈开，并通过扫描电子束显微镜观察空隙。我们确定了这些空隙是玻璃内部的空位。通过重复超短激光脉冲的照射和聚焦透镜的平移，我们成功地将空隙沿光轴移动了约5μm沿着。我们还成功地将两个空洞合二为一，但不幸的是，这些结果并不能直接解释其机理。然而，它们为解释石英玻璃中折射率变化的机制提供了强有力的线索。这项工作的一部分已发表在《光学快报》上，并正在准备出版。在日本科学技术公司的帮助下，正在申请与空隙的移动和合并以及双折射光波导的形成有关的两项专利。空洞的移动和合并的结果被技术杂志Laser Focus World（Vol.37，Issue 2，2001）所采用。少

项目成果

Wataru Watanabe et al.: "Optical seizing and merging of voids in silica glass with infrared femtosecond laser pulses"Optics Letters. 25・22. 1669-1671 (2000)

Wataru Watanabe 等人：“利用红外飞秒激光脉冲对石英玻璃中的空隙进行光学捕获和合并”光学快报 25・22（2000 年）。

Kazuhiro Yamada et al.: "In situ observation of photoinduced refractive index changes in filaments formed in glasses"Optics Letters. 26・1. 19-21 (2001)

Kazuhiro Yamada 等：“玻璃中形成的细丝的光诱导折射率变化的原位观察”光学快报 26・1（2001）。

Wataru Watanabe, Tadamasa Toma, Kazuhiro Yamada, Junji Nishii, Ken- ichi Hayashi and Kazuyoshi Itoh: "Optical seizing and merging of voids in silica glass with infrared femtosecond laser pulses"Opt. Lett.. Vol.25,No.22. 1669-1671 (2000)

Wataru Watanabe、Tadamasa Toma、Kazuhiro Yamada、Junji Nishii、Kenichi Hayashi 和 Kazuyoshi Itoh：“用红外飞秒激光脉冲光学捕获和合并石英玻璃中的空隙”Opt。

Wataru Watanabe et al.: "Observation of voids and optical seizing of voids in silica glass with infrared femtosecond laser pulses"Proceedings of SPIE. 4088. 44-47 (2000)

Wataru Watanabe 等人：“用红外飞秒激光脉冲观察石英玻璃中的空隙和光学捕获空隙”SPIE 论文集。

Osamu Matoba et al.: "Photorefractive Optics : Material, Properties, and Applications (Academic Press, San Diego)"Dynamic interconnections using photorefractive crystal. 385-429 (1999)

Osamu Matoba 等人：“光折变光学：材料、特性和应用（学术出版社，圣地亚哥）”使用光折变晶体的动态互连。