Research On Transmissive Synchronous High-energy Laser Optical Systems

Compared with the traditional foreign body removal methods in transmission network,laser foreign body removal equipment has the characteristics of fast speed,non-contact live operation,high accuracy,and easy assembly.Countries all over the world are competing to develop laser removal technology in the field of transmission lines.However,in fact,long-distance transmission may not achieve the effect of removing foreign matter,but requires continuous high power irradiation.In addition to having a high power and high beam quality light source,the laser foreign body removal equipment must also rely on a high energy laser system which can focus the beam and carry out real-time imaging of the target.The high energy laser system is the core component of the laser foreign body removal device.At the same time,in order to ensure the aiming and tracking accuracy of laser foreign body removal equipment,a set of high energy laser system which can be used in laser foreign body removal equipment is designed by using common aperture design idea combined with practical engineering application.In this thesis,the synchronous high energy laser system is studied as follows:1.Research the current development of the grid foreign body removal methods and the research progress of aperture optical design,summarizes the laser foreign body removal equipment to its core parts of high energy laser system working principle,this thesis design the high-energy laser optical system including laser and optical imaging system,by comparing the transmission type and reflection type and the characteristics of catadioptric system,Finally,the transmission structure was selected.2.In order to ensure the removal effect and aiming accuracy of the high energy laser system for foreign bodies,the common axis error between the visible light imaging and laser emission systems should be eliminated.Therefore,the high energy laser system adopts the design idea of common aperture,and the laser emission system can be focused within a certain distance by focusing.The transmission Galileo system is used in both the two stage beam expanding systems.According to the high power characteristics and index requirements of the high energy laser system,the glass with high temperature resistance should be selected.Moreover,the band range of the laser emission system is narrow and does not need to correct the chromatic aberration,so only a kind of quartz glass is used.The wide spectrum and large chromatic aberration generated in the visible band are compensated by the lens imaging group.According to the actual engineering application conditions,the thermal analysis and reasonable tolerance distribution of the system are carried out.Finally,a synchronous high energy laser optical system that meets the requirements of various indexes is developed,which can realize the laser focusing and synchronous imaging function in the variable range of 100m～2000m.3.The key factor affecting the laser transmission performance is the atmospheric turbulence intensity.The influence of atmospheric turbulence on the laser intensity distribution and the target area is analyzed,and the simulation is carried out according to the corresponding formula.Under the comprehensive effects of moderate atmospheric turbulence,laser beam quality,thermal halo and atmospheric dithering errors,the size of the focusing spot is proportional to the transmission distance,and the spot diameter meets the index requirements of the laser emission system.Finally,the experimental results show that the designed high energy laser system has good focusing ability.