Abstract: The design method of large aperture and wide spectrum refracting collimator is introduced. The refracting collimator system of the suitable glass materials, original configuration selection, and power allocation is discussed with the wavelength range of 400nm~1100nm and the focal length of 2000mm and the relative aperture of F0.1. Based on the modified relative partial dispersion P and abbe number V, the apochromatic equations is calculated to solve the initial structure, and then the final design is optimized in the whole spectral range by Zemax software. Finally, the spot diagrams is better than 5μm within the center field of view , central wavelength of wavefront aberration is better than 1/60λ and the maximum focal shift range is less than 0.33mm. The result shows that the remaining aberrations are well revised in the design index.

Key words: optics design, large aperture, wide spectrum, apochromatic, collimator