光学学报, 2016, 36(5): 0505002, 网络出版: 2016-05-01

啁啾光纤光栅的温度调谐特性研究

Research on Temperature Tuning Properties of Chirped Fiber Grating
作者单位

中国科学院西安光学精密机械研究所瞬态光学与光子技术国家重点实验室, 陕西 西安 710119

摘要
根据啁啾光纤光栅的温度可调谐性这一原理,提出通过控制啁啾光纤光栅的温度,改变其色散量,从而获得最小输出脉宽的方案,并通过实验验证了这一想法的可行性。利用啁啾光纤光栅作为啁啾脉冲放大(CPA)系统中的脉冲展宽器,用空间光栅对作为脉冲压缩器,通过压缩器为脉冲提供的负色散来补偿展宽器为脉冲引入的正色散。利用自相关仪测量压缩输出脉冲宽度随温度的变化情况,间接反映啁啾光纤光栅色散量随温度的变化情况。从实验所得数据可以得知,当温度从-7 ℃上升到50 ℃时,脉宽从1057 fs先下降到764 fs后又上升到910 fs,共变化了439 fs。在此过程中,随温度的上升,啁啾光纤光栅的色散由补偿不足变为过补偿。
Abstract
According to the temperature tenability of chirped fiber grating, the minimum output pulse width can be obtained by controlling the fiber grating’s temperature to change the dispersion of the chirped fiber grating, and the feasibility of this idea is demonstrated through experiments. The chirped fiber grating is used as the stretcher in the fiber chirped pulse amplification (CPA) system, and the gratings-pair is used as compressor. The positive dispersion brought by the stretcher is compensated by the negative dispersion provided by the compressor. The output pulse width is measured by the auto-correlation for denoting the dispersion of the chirped fiber Bragg grating indirectly as a function of temperature. It can be seen from the obtained experimental data that, when the temperature rises from -7 ℃ to 50 ℃, the pulse width falls from 1057 fs to 764 fs, and then rises to 910 fs, with a total change of 439 fs achieved. In the experiment, dispersion increases with temperature rising, changing from insufficient dispersion compensation to over dispersion compensation.
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