Laser frequency tuning technology based on piezoelectric ceramics

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 0.8 nm (ie 100 GHz) tuning range can be realized.