Basic Study of Laser Beam Applications to Space

激光束在空间应用的基础研究

• 批准号: 04452188
• 负责人: TAKANO Tadashi
• 金额: $ 1.6万
• 依托单位: THE INSTITUTE OF SPACE AND ASTRONAUTICAL SCIENCE
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04452188/
• 关键词: Optical antenna; Antenna gain; Mirror shaping; Manufacturing error; Electrooptical constant measurement; photo refractive sentitivity; Machzehnder interferometer; Adaptive coding; 一体形; 電気光学定数; 曲面修整; 支持構造; 金属反射率; 空間ビーム伝送; 連接符号

As for optical antennas, a computer program has been made to shape reflectors. It is shown that the antenna gain can be improved by 1.5dB and the weight can be reduced by 40 percent in comparison with Gaussian optics. Next, the characteristics degradation due to support structures and manufacturing errors is analyzed for the case of dual reflector antennas. It is clarified that, If the manufacturing error amounts to be 5mmu in thickness, the aperture distribution should be tapered from a rectangular pattern at the shoulders, and the F/D value should be larger than 0.5. The reflector curves are typically aspheherical ones.An optical antennas has been manufactured by an NC machine, and measured using the near-field method. The amplitude distribution is close to the desired one. Phase distribution in the near field and the far field patterns should be measured later.In order to measure electrooptical contants which play an important role in the interference phenomena, a simplified and highly accurate measurement facility is realized with amplitude modulation scheme. The electrooptical constant of a proton-exchanged LiNb03 waveguide has been successfully obtained. And the photo refractive sensitivity has been measured quantitatively for the first time.The coding scheme to adapt the coding ratio according to the ratio of optical signal power and the noise power is proposed.

至于光学天线，已经编写了计算机程序来塑造反射器的形状。结果表明，与高斯光学器件相比，天线增益可提高1.5dB，重量可减轻40%。接下来，针对双反射器天线的情况，分析由于支撑结构和制造误差而导致的特性劣化。明确：如果厚度制造误差达到5mmu，则孔径分布应从肩部的矩形图案逐渐变细，且F/D值应大于0.5。反射器曲线通常是非球面曲线。光学天线由数控机床制造，并使用近场方法进行测量。振幅分布接近所需的分布。近场相位分布和远场方向图应稍后测量。为了测量在干涉现象中起重要作用的电光成分，采用幅度调制方案实现了简化且高精度的测量装置。成功获得了质子交换LiNbO 3 波导的电光常数。并首次定量测量了光折射灵敏度。提出了根据光信号功率与噪声功率的比值来调整编码比的编码方案。

项目成果

高野 忠.児島 敦 渡部 雅樹: "光アンテナの基礎検討" 1992年電子情報通信学会秋季大会論文集. 2. 58- (1992)

Tadashi Takano、Atsushi Kojima、Masaki Watanabe：“光学天线的基础研究”1992 年 IEICE 秋季会议记录 2. 58- (1992)。

T.Takano and A.Kojima: "Fundamental Investigation of an Optical Antenna" 1993 IEEE APS/URSI Joing Meeting,Ann Arbor.

T.Takano 和 A.Kojima：“光学天线的基础研究”1993 年 IEEE APS/URSI 联席会议，安娜堡。

Y.Kondo,et al.: "Quantitaively Measured Photorefractive Sensitivity of Proton-Exchanged LN,Proton-Exchanged MgO-doped LN and Ion-Exchanged KTP Waveguides" GRIN. 1992 (171-174)

Y.Kondo 等人：“定量测量质子交换 LN、质子交换 MgO 掺杂 LN 和离子交换 KTP 波导的光折变灵敏度”GRIN。

児島敦、高野忠、: ""衛星間通信用光アンテナの基礎検討"、" 第37回宇宙科学技術連合講演会、. 1B16、. pp.59-60 (1993.)

Atsushi Kojima、Tadashi Takano：“卫星间通信光学天线的基础研究”，第 37 届空间科学技术联盟讲座，1B16，第 59-60 页（1993 年）

"Quantitatively Measured Photorefractive Sensitivity of Proton-Exchanged LN," Proton-Exchanged MaO-Doped Ln and Ion-Exchanged KTP Waveguides. pp.171-174) ((1992,GRIN,)

“质子交换 LN 的光折变灵敏度的定量测量”，质子交换 MaO 掺杂 Ln 和离子交换 KTP 波导。