Design of baffle for three-mirror optical system

The main stray light of three-mirror system is the light directly comes from the object to the tertiary mirror without hitting on the primary and secondary mirror. The designing of baffles to suppress the stray light is discussed, the formula is deduced, and an auto-design CodeV macro is programmed. An example of baffle design for a three mirror system is cited, moreover the image performance is analyzed and confirmed by ray tracing simulation and imaging experiments.