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Optical frequency conversion by ultra-fine waveguide and their application to phtonic integration

超细波导光频率转换及其在光子集成中的应用

基本信息

批准号：
17560039
负责人：
NAGANUMA Mitsuru
金额：
$ 1.98万
依托单位：
Teikyo University of Science & Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

The research project concerns characteristics of photonic crystal that has multi-dimensional photonic periodic structures in the material. Especially, nonlinear properties of a photonic crystal fiber were investigated.Site dependent nonlinear optical properties are characterized by pumping 140 fs pulses at independently addressable several small cores formed in a single index-guiding photonic crystal fiber (PCF). The positional assignment of pumping site onto the PCF is achieved based on the reflection method to observe in situ the waveguiding structure of PCF input facet relative to the fixed focal point of the collimated laser beam. Pumping was done by Ti-sapphire laser with the wavelength around 800nm. A series of input peak power dependent spectra at these small cores demonstrate generation of a wide spectrum coherent light (supercontinuum light) from infra-red to visible light down to the violet, which were discussed from the viewpoint of core-size variation. Visible light generat … More ion at smaller core is principally due to an increase of the degree of anomalous dispersion by decreasing the core size.A unique measurement setup has been designed to examine the fiber-length-dependent energy conversion in multi-core-type PCFs. Gradual spectral change of some peaks generating through 5 m-long PCF has been observed by using this system. Those peaks and their shifts have been identified as solitons and soliton self-frequency shift. On the other hand, the origin of peaks in shorter-wavelength regime is neither dispersive waves which are emitted and trapped by solitons nor idler waves generated by four-wave mixing or sum-frequency shift. Wavelength dispersion profiles of 5m-long PCF have been determined by measuring chromatic dispersion using a spectroscopic streak camera and the supercontinuum light, which is generated from a 20-mm-long PCF under illumination of a femto-second Ti-sapphire laser pulse.An air-cladding type small core waveguide structures were fabricated to investigate the shorter length limit of PCF using photolithographic techniques. The 35 micrometer-long SiO2 thin wire on the sharp edge of the Si ridge structure was fabricated. A wavelength converted new spectrum around 795nm was observed with this waveguide under pumping with 810nm light from Ti-sapphire laser. These results are promising for developing photonic integrated functional devices. Less

本研究课题主要研究具有多维光子周期结构的光子晶体的特性。特别是研究了光子晶体光纤的非线性光学特性，通过在单个折射率引导光子晶体光纤（PCF）中形成的多个可独立寻址的小纤芯上泵浦140 fs脉冲，研究了位置相关的非线性光学特性。利用反射法原位观察PCF输入端面相对于准直激光束固定焦点的波导结构，实现了泵浦点在PCF上的位置分配。泵浦采用钛蓝宝石激光器，泵浦波长在800nm左右。一系列的输入峰值功率相关的光谱在这些小的核心证明了一个宽光谱相干光（超连续光）的产生从红外线到可见光下到紫色，这是从核心的大小变化的观点进行了讨论。可见光发生器 ...更多信息较小纤芯的离子主要是由于减小纤芯尺寸而增加了异常色散程度。设计了一种独特的测量装置来研究多纤芯型光子晶体光纤中与光纤长度相关的能量转换。利用该系统观察到了一些通过5 m长光子晶体光纤产生的谱峰的渐变现象。这些峰和它们的位移被确定为孤子和孤子自频移。另一方面，在较短的波长范围内的峰值的起源既不是色散波的发射和捕获的孤子，也不是闲置波产生的四波混频或和频移。利用飞秒钛宝石激光脉冲照射20 mm长的光子晶体光纤产生的超连续谱光，利用光谱条纹相机测量了5 m长的光子晶体光纤的波长色散曲线，并利用光刻技术制作了空气包层型小芯波导结构，研究了光子晶体光纤的短芯极限。在硅脊结构的尖锐边缘上制作了35微米长的SiO2细线。在810nm钛宝石激光器的泵浦下，观察到了795nm附近的波长转换新光谱。这些结果对光子集成功能器件的研制具有重要意义。少