SPIE Proceedings [SPIE Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016) - Suzhou, China (Tuesday 26 April 2016)] 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test, Measurement Technology, and Equipment - Measurement of deformation and frequency response characteristic of PZT tube in tunable fiber laser with short period based on coherent laser beam