Fig. 1. Optical path model of the RC system

Fig. 2. Wavefront aberration measurement based on vision ray calibration model

Fig. 3. Wavefront aberration results and error of the RC system. (a) Theoretical calculation result; (b) vision ray calibration calculation result; (c) difference between them

Fig. 4. Actual surf added by the RC primary mirror

Fig. 5. Wavefront aberration results and error after adding the actual surf to the RC system primary mirror. (a) Theoretical calculation result; (b) vision ray calibration calculation result; (c) difference between them; (d) comparison of the Zernike coefficients of them

Fig. 6. Off-axis aberration analysis caused by secondary mirror offset in RC system. (a) X-direction decenter; (b) Y-direction decenter; (c) X-direction tilt; (d) Y-direction tilt

Fig. 7. Wavefront aberration measurement

Fig. 8. Measurement and alignment of RC system. (a) Screws for alignment of secondary mirror; (b) fringe pattern of RC system

Fig. 9. Measurement results of the RC system before and after alignment. (a)‒(c) Measurement result before alignments with the first four、six and seven terms removed of Zernike polynomials; (d)‒(f) measurement result after alignments with the first four, six and seven terms removed of Zernike polynomials.

Fig. 10. Result of the alignments. (a) Result of aberration measurement; (b) coma and astigmatism decrease with alignments

Fig. 11. Measurement and alignment of the plano-convex lens. (a) Five-dimensional alignment base; (b) fringe pattern of the plano-convex lens

Fig. 12. Measurement results of the plano-convex lens before and after alignments. (a)‒(c) Measurement result before alignments with the first three, five and seven terms removed of Zernike polynomials; (d)‒(f) measurement result after alignments with the first three, five and seven terms removed of Zernike polynomials

Fig. 13. Low-order coma and astigmatism decrease with alignment

Fig. 14. Principle of interferometer measurement

Fig. 15. Comparison of wavefront aberration results. (a) Vision ray calibration measurement result; (b) interferometer measurement result