Application of a cubic phase plate to a reflecting telescope for extension of depth of field.
APPLIED OPTICS(2020)
摘要
Wavefront coding is an accepted technique to extend the depth of field in incoherent optical systems. We present the design of a reflecting telescope with wavefront coding by employing a cubic phase plate (CPP). We propose a method to reduce the CPP size by changing its position from the aperture stop to a secondary mirror without varying the point-spread function, which is insensitive to defocusing. This change in position reduces the diameter by almost three orders and increases the third-order coefficients of the x y polynomial surface by two orders, thus easing manufacturing. (C) 2020 Optical Society of America
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