调制光栅Y分支可调谐激光器高精准波长调谐特性

High Precision and Accuracy Wavelength Tuning Characteristics of Modulated Grating Y-Branch Tunable Lasers

搭建了调制光栅Y分支(MGY)可调谐激光器高精准波长调谐系统,实现了粗扫描结合细扫描的高精度波长扫描标定。在此基础上,对MGY激光器输出波长以及内置法布里-珀罗(F-P)标准具的温度漂移特性进行分析,发现MGY激光器输出波长与温度具有良好的线性关系,且其输出波长曲线的斜率不变,截距随温度线性变化。研究了基于外部气体吸收基准的高精准波长校准方法,并进行实验测试。研究结果表明,在-25～+75℃温度范围内,波长扫描范围为40 nm时,所搭建系统的调谐线性度优于0.9999,调谐波长精度优于0.18 pm,准确度优于0.12 pm。

A high precision and accuracy wavelength tunable system for a modulated grating Y-branch(MGY) tunable laser is built. The high-precision wavelength scanning and calibration are realized by coarse scanning and fine scanning. Based on this, the temperature drift characteristics of the output wavelength and the internal Fabry-Perot(F-P) etalon are tested. It is found that there exists a good linear relationship between the output wavelength of this MGY laser and temperature, whose slope is constant. The intercept varies linearly with temperature. A high precision and accuracy wavelength calibration method based on external gas absorption reference is researched and its experimental test is conducted. The research results show that within the temperature range of-25-+75 ℃ and the wavelength scanning range of 40 nm, the established system possesses a tuning curve linearity better than 0.9999, a tuning wavelength precision better than 0.18 pm, and an accuracy better than 0.12 pm.