The method of remote micro-vibration measurement is studied and presented based on the laser feedback effect in this paper, and the key factors of remote vibration measurement are analyzed. The vibration measurement system is designed and built based on the laser feedback and the research of the remote micro vibration measurement is carried out. The system has ultrahigh measuring sensitivity and the working distance is 25 meters, which can measure the vibration of non-cooperative target. The system has the capability to realize the non-contact measurement of remote micro-vibration at different driving signals，and can fulfill the complex vibration measurement and reproduction of multiple frequencies. It can identify the voice signal，and the voice signal reproduced is clear to hear. The system can meet various requirements of vibration measurement and has great significance in practical application.
A laser-induced plasma in laser-material interaction due to the fact that it is in an extreme state of high-energy concentration is shown to be a powerful tool to perform drilling process to create micro channels in bulk quartz substrates under certain conditions. The plasma was induced by a Q-Switched Nd:YAG laser incident to a quartz substrate after pre-damaged by thermal-induced processing. The channels are of high quality with smooth kerf surface and the dimension of channels can be controlled from around 25 to 140 microns by a software program that interfaces with the laser system. A study of the dependence of drilling rate on the depth of channels provides a straightforward method for controlling the formation of plasma. The process technology, process characterization, and initial test results of the fabricated micro channels are presented in this paper.