Measurement of Deformation and Frequency Response Characteristic of PZT Tube in Tunable Fiber Laser with Short Period based on Coherent Laser Beam

摘要

The parameters of light source in synthetic aperture ladar(SAL) is very important to both the design of system and the signal processing algorithm. As the light source in the SAL, the fiber laser use PZT(piezoelectric ceramics) tube stretching the fiber Bragg grating in order to tune the laser frequency. So it is necessary to obtain the deformation and frequency response of PZT tube driven by sawtooth voltage of different periods. Accordingly, the homodyne detection is used to measure the girth variation of PZT tube. Meanwhile ,the frequency response of PZT tube can be viewed with the homodyne signal. The results from measuring a PZT tube show that the method can work well.