Optical path design for tilted visual field based on HL-2A Tokamak

It is very effective to measure the particle parameters of the high temperature plasma on the HL-2A Tokamak device by means of charge exchange recombination spectroscopy.In order to obtain signals of 480~650 nm in visible spectrum band and larger observing field in the tilted space geometry location,and satisfy the requirement of small fiber numerical aperture,an optical system with one mirror and four pieces of lens was designed with ZEMAX software.The performance of the system was verified by maximum diffusion spot on image surface.