基于压电陶瓷的激光频率调谐技术

Laser frequency tuning technology based on piezoelectric ceramics

在充分研究各种激光调谐方法优缺点的基础上,针对其调谐范围、调谐速率、调谐线性等方面存在的不足,提出一种基于压电陶瓷的激光频率调谐技术。该方法将压电陶瓷与光纤光栅激光器的布拉格光栅进行粘结,通过调整压电陶瓷的驱动电压来带动布拉格光栅的伸缩,实现波长(即频率)的调谐。同时,利用虚拟仪器中的计算机软件拟合技术,校正压电陶瓷输入电压与输出位移之间的非线性,使系统呈线性频率调谐,以提高测量精度。实验结果表明,当压电陶瓷的驱动电压变化126V时,可实现0.8nm(即100GHz)的调谐范围。

Based on sufficient investigation of the advantages and disadvantages of several laser tuning methods,aiming at the shortcomings in tuning range,tuning speed,tuning linearity,etc.,we proposed a new laser frequency tuning technology based on piezoelectric ceramic.In this method,the fiber Bragg grating(FBG)was stuck to the piezoelectric ceramics,and the driving voltage of the piezoelectric ceramics was adjusted to driven the Bragg grating telescoping,so as to achieve the wavelength(ie frequency)tuning.Meanwhile,the nonlinearity between piezoelectric ceramics input voltage and output displacement was corrected by using the fitting software in virtual instrument to make the system exhibit a linear frequency tuning,in order to improve the measurement accuracy.Experiment results show,when the drive voltage of piezoelectric ceramics changes to 126 V,the 0.8nm(ie 100GHz)tuning range can be realized.