项目名称： 高功率光纤飞秒激光器用高阶色散补偿镜的研究

项目编号： No.61275161

项目类型： 面上项目

立项/批准年度： 2013

项目学科： 无线电电子学、电信技术

项目作者： 沈伟东

作者单位： 浙江大学

项目金额： 78万元

中文摘要： 具有可靠性、简约性和稳定性的光纤飞秒激光是新一代超快激光技术。受到自相位调制等非线性效应的影响，在高功率光纤飞秒激光中高阶色散补偿成为限制超短脉冲输出的最主要因素。本项目提出了光学多层薄膜实现高阶色散补偿的新方案。理论上研究TOD补偿镜的设计方法，采用带浮点相位优化，并通过把容差加入评价函数，提高设计结果的鲁棒性。基于双离子束溅射，实验上深入研究透反射光学宽波段监控提高厚度精度的方法，探索不同的判停方式、在线快速反演、再优化对制备良率的提高。搭建时-频域白光干涉系统，研究波长-时间-能量三维数据提取TOD的算法，分析光谱分辨率、纳米步进平台重复性对测试精度的影响。随着这些科学和技术问题的解决，将实现高阶色散补偿元件的研制，满足高功率光纤飞秒激光技术的需要。

中文关键词： 光学薄膜；色散补偿镜；超快激光；；

英文摘要： In recent years,femtosecond fiber lasers have attracted much attention as practical alternatives to solid-state lasers,owing to its reliability,compactness and stability.Affected by the nonlinear effect,mainly self-phase modulation(SPM)，the primary limitation to achieving shorter pulses was attributed to uncompensated third-order dispersion(TOD). In this proposal,we present a new TOD compensation technology using multilayer mirrors.The design of TOD mirrors will be theoretical studied with phase optimiztion based on floating constants. Thickness error sensitivity will be considered in the merit function to obtain robust design.A wide-band optical monitoring system in both reflection and transmission will be developed in Dual Ion Beam Sputtering(DIBS) plant.Various methods to determine the critical point during the deposition will be developed to obatin better thickness accuracy. On-line reverse engineering and re-optimization will be utlized to improve the production yield of TOD mirror.A Michelson white-light interferometer in both time and frequency domain will be built up.An algorithm to extract TOD from the measured interferogram will be provided. The effect of spectral resolution and stability of nanomter stepper on the measurement accuracy will be analyzed.As the above issues involving both science and tec

英文关键词： optical coatings；dispersive mirrors；ultrafast laser；；