Sensing Analysis And Research On Laser Output Characteristics Of Fiber DBR Sensor

With the rapid development of laser technology,the methods which use the various attributes of light as the non-contacted detection means have obtained the great improvement.In addition,the development and application of Q-switched fiber sensing technology is a historic breakthrough in the development of optical fiber laser technology.The energy of the light wave is compressed by a Q switch to form a pulse,which increases the peak power of the laser output by several orders of magnitude.Based on the above background,this paper proposes the sensing analysis and research on laser output characteristics of fiber DBR sensor.This paper firstly introduces the research background and the significance of studying the Q-switched characteristics in time domain,and then elaborates the development process and research status of optical fiber sensing technology in detail.Then,the Q-switched technology based on Er³⁺-doped fiber sensor is introduced.At the same time,the Q-switched principle is introduced from the energy level and the rate equation level.In the simulation experiment,the magnetic-solid coupling model is established in the 3-dimensional space and the deformation of the optical fiber sensor coated with ferromagnetic fluid in the magnetic field is simulated.In the experimental operation,the time-domain Q-switched performance of fiber-optic DBR sensor is described in detail.The composition and design of the experiment platform is introduced and the experimental results were plotting analysis.The results show that as the pump power increases,the pulse duration of the self Q-switching output pulse of DBR sensor is shortened,but its amplitude and pulse repetition rate are getting larger,which is a typical feature of self Q-switching,but also shows the laser absorption effect of the internal saturation.In addition,when the pump power is changed from 80mW to 330mW,the peak power P of the output pulse increases almost linearly from 82.57?W to 1897.2?W,and the pulse energy E of it increases from 0.116nJ to 0.379nJ.In general,the higher pumping power in the laser cavity speeds up the excitation of the gain particles,making it easier to achieve the saturation absorption.