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Study of Integnated-Optic Amplifier Using Garnet Crystalline Thin-film Waveguide.

石榴石晶体薄膜波导集成光放大器的研究。

基本信息

批准号：
63550254
负责人：
MIYAZAKI Yasumitsu
金额：
$ 1.47万
依托单位：
Toyohashi University of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1990
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-63550254/
关键词：
Optical amplifier Optical integrated circuits Garnet thin film Optical waveguide ガーネット薄膜

项目摘要

Optical thin film amplifiers can be a basic element in integrated optic circuits for optical communication and signal processing.The thin film of 1.3 at. % Nd doped yttrium gallium garnet( Nd : YGG) were deposited on substrates of yttrium aluminium garnet (YAG) by RF sputtering. The amorphous films deposited at 600^ﾟC were crystallized by annealing at 1000^ﾟC. The minimum optical propagation loss (at 1064nm ) was 2.2dB/cm.The absorption spectrum and the fluorescence spectrum of Nd : YGG were minutely measured. The peak of the absorption spectrum was located at 808nm. The peaks of the fluorescence spectrum were located at 1057.5nm, 1060.0nm and 1061.87nm.To obtain a signal light of 1.06mum band, a tunable Nd : YAG laser pumped by LD was prepared. A thin etaron of thickness of 0.14mm was put in a cavity as the device to choose wavelength for 1064nm and 1061.5nm. A maximum output power of about 0.5mW and 2mW were obtained for 1061.5nm and 1064nm, respectively.The gain and the S/N characteristics measured by using signal at wavelength 1061.5nm. As the results, the gain saturation was confirmed by increasing the signal power. Approximately, linear gain characteristics were obtained for the signal power of 10muW. The maximum gain of 3.7dB was obtained for pumping of about 13mW and the S/N ratio was 5.4dB.The amplification characteristics of TW type amplifier for steady state were analyzed by rate equations for a fourーlevel system. From the numerical analysis, the gain of about 10dB is obtained for the signal power of 10muW with the pumping of lmW, the amplifier length of lcm and the film thickness of 2.5mum.

光学薄膜放大器是光通信和信号处理中集成光路的基本元件。采用射频溅射法在钇铝石榴石（YAG）基片上制备了掺Nd：YGG（Nd：YGG）薄膜。在600 ° C下沉积的非晶薄膜通过在1000 ° C下退火而结晶。最小光传输损耗（1064 nm）为2.2dB/cm。其吸收峰位于808 nm处。荧光光谱的峰值分别位于1057.5nm、1060.0nm和1061.87nm。为了获得1.06 μ m波段的信号光，研制了LD泵浦的可调谐Nd：YAG激光器。在谐振腔内放置了厚度为0.14mm的标准具作为选择1064 nm和1061.5nm波长的器件。在1061.5nm和1064 nm处分别获得了0.5mW和2 mW的最大输出功率，用1061.5nm处的信号测量了增益和信噪比特性。作为结果，通过增加信号功率来确认增益饱和。在信号功率为10 μ W时，获得了近似线性的增益特性。在抽运功率约为13 mW时，获得了3.7dB的最大增益，信噪比为5.4dB。用速率方程分析了TW型四能级系统的稳态放大特性。数值分析表明，当泵浦功率为1 mW，放大器长度为1cm，膜厚为2.5 μ m时，信号功率为10 μ W时，增益约为10 dB。