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Ultra-Wide (a Few Tens THz) Optical Sideband Generation by Large Amplitude Electrooptic Modulation and Its Applications.

大振幅电光调制产生超宽（几十太赫兹）光边带及其应用。

基本信息

批准号：
02452086
负责人：
KOBAYASHI Tetsuro
金额：
$ 4.16万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1990
资助国家：
日本
起止时间：
1990 至 1991
项目状态：
已结题

项目摘要

We have developed new electrooptical methods which make it possible to generate extremely wide modulation sidebands. In the first year of this research, we developed novel electrooptic modulators which operate in large amplitude in microwave and millimeter wave regions.We overcome the limitation of velocity miss-matching in a high frequency electrooptic modulator with a novel velocity matching scheme, which makes a modulator efficient in millimeter wave and microwave regions. The velocity matching between modulating microwave and light has been achieved by using higher order microwave resonant modes on a micro strip line. We developed the electrooptic modulator/deflector of an LiTaO_3 crystal at 16 GHz. An experiment on large amplitude phase modulation was carried out with the velocity-matched modulator. As the result, we obtained modulation sidebands of 0.7 THz width, which is a record of modulation sideband at the frequency.In the next year, we tried the combination of a Ti : Sapphire laser and the large amplitude modulator to extend the modulation sideband width . For the first step of this study, an experiment of mode locking using an electrooptic phase modulator was tested with a coupled cavity configuration. For this experiment, we prepare another electrooptic phase modulator whose operating frequency was the internal longitudinal mode spacing of the laser. The modulator was placed within the external cavity. We confirmed the mode locking and obtained ultrashort pulses.We estimate after these experiments that the combination of the velocity matched microwave modulator and a Ti : Sapphire laser will extend the modulation sideband width to several tens tera-hertz.

我们已经开发了新的电光方法，使之有可能产生极宽的调制边带。在本研究的第一年，我们研制了一种新型的微波和毫米波大幅度电光调制器，采用一种新的速度匹配方案克服了高频电光调制器中速度失配的限制，使调制器在毫米波和微波波段都有效率。利用微带线上的高阶微波谐振模，实现了调制微波与调制光波的速度匹配。我们研制了16 GHz的LiTaO_3晶体电光调制器/偏转器。利用速度匹配调制器进行了大幅度相位调制实验。结果得到了0.7THz宽的调制边带，这是该频率下调制边带的一个记录，在接下来的一年中，我们尝试了钛宝石激光器和大振幅调制器的组合来扩展调制边带宽度。在本研究的第一步中，利用耦合腔结构进行了电光相位调制器的锁模实验。在这个实验中，我们准备了另一个电光相位调制器，其工作频率是激光器的内部纵模间距。将调制器放置在外腔内。实验证实了微波调制器的锁模效应，并获得了超短脉冲，估计将速度匹配微波调制器与钛宝石激光器相结合，可以将调制边带宽度扩展到几十太赫兹。