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Development of Ultrafast Electrooptic Lens Modulator and Application to Ultrashort Optical Pulse Generation.

超快电光透镜调制器的开发及其在超短光脉冲生成中的应用。

基本信息

批准号：
11555096
负责人：
KOBAYASHI Tetsuro
金额：
$ 7.49万
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：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Here, we concentrated our research on the lens modulator which is applicable to the ultra-short light pulse generation. Main results of the research are shown as follows ;1) Establishment of domain inversion technology with high quality :2) Confirmation of the function of lens phase modulation and optimization of its design :The domain-inversion shapes are designed so as to obtain accurate lens effect as well as highly effective phase modulation by using LiTaO_3 electrooptic crystal. The lens modulator was produced based on the above results and confirmed its operation as a good quality lens modulator. Besides this, we succeeded in the development of the lens deflector which accompanies with the deflection function. Driving frequency of the lens modulator and the lens deflector are in the range of 10-20GHz (at present highest speed in the world).3) Experiments of ultra-short optical pulse generation :We succeeded in the generation of 500fs optical pulses with 16GHz repetition without the background light from the CW argon laser by using the lens phase modulator together with diffraction grating and a slit. Moreover, we succeeded in obtaining the 2ps pulse train without return pulses using the deflector with the effect of the lens together with the slit.4) We proposed a new method to decrease the background light by using the single mode optical fiber instead of the slit. In this method we don't need the diffraction grating because the group velocity dispersion of the fiber is utilized. Studies shown in 2)-4) have all been done at the first time in the world.5) The development of the lens modulator of the low insertion loss which could be applied to the Fabry-Perot modulator was not completed.

本文重点研究了适用于超短光脉冲产生的透镜调制器。主要研究结果如下：1)建立高质量的畴反转技术2)确定透镜调相功能并优化其设计：设计畴反转形状，利用LiTaO_3电光晶体获得精确的透镜效果和高效的相位调制。在此基础上研制了透镜调制器，并证实了该调制器是一种质量优良的透镜调制器。除此之外，我们还成功地开发了带有偏转功能的透镜偏转器。透镜调制器和透镜偏转器驱动频率在10-20GHz范围内（目前世界最高速度）。3)超短光脉冲产生实验：利用透镜相位调制器结合衍射光栅和狭缝，在没有背景光的情况下，成功地产生了500fs、重复频率为16GHz的连续氩激光器光脉冲。此外，我们还成功地利用透镜和狭缝作用的偏转板获得了无返回脉冲的2ps脉冲序列。4)提出了用单模光纤代替狭缝减少背景光的新方法。该方法利用光纤的群速色散，不需要衍射光栅。2)-4)所示的研究都是世界上第一次完成的。5)可应用于法布里-珀罗调制器的低插入损耗透镜调制器的研制尚未完成。