A new method for testing aspheric surfaces by annular subaperture stitching interferometry is introduced. It can test large-aperture and large-relative-aperture aspheric surfaces at high resolution, low cost, and high...A new method for testing aspheric surfaces by annular subaperture stitching interferometry is introduced. It can test large-aperture and large-relative-aperture aspheric surfaces at high resolution, low cost, and high efficiency without auxiliary null optics. The basic principle of the method is described, the synthetical optimization stitching model and effective algorithm are established based on simultaneous least-square fitting. A hyperboloid with an aperture of 350 mm is tested by this method. The obtained peak-to-valley （PV） and root-mean-square （RMS） values of the surface error after stitching are 0.433A and 0.052A （A is 632.8 nm）, respectively. The reconstructed surface map is coincide with the entire surface map from null test, and the difference of PV and RMS errors between them are 0.031A and 0.005A, respectively. This stitching model provides another quantitive method for testing large aspheric surfaces besides null compensation.展开更多
The free surface and unrotational-symmetric surface optical elements have been applied more and more widely along with the development of optical design technology, although they are still difficult for manufacturing....The free surface and unrotational-symmetric surface optical elements have been applied more and more widely along with the development of optical design technology, although they are still difficult for manufacturing. In this letter, a SiC unrotational-symmetric aspheric surface whose surface equation is z =- 3λ（x^a ＋ y^3） （λ= 0.6328μm） has been introduced. The tilt abstraction is adopted to minimize the material removal. The surface figures are peak-to-valley （PV） value of 0.327A and root-mean-square （RMS） value of 0.023A. A non-null testing method based on digital mask is proposed to test this surface. The accuracy of the method is testified by the experiment of standard sphere testing.展开更多
文摘A new method for testing aspheric surfaces by annular subaperture stitching interferometry is introduced. It can test large-aperture and large-relative-aperture aspheric surfaces at high resolution, low cost, and high efficiency without auxiliary null optics. The basic principle of the method is described, the synthetical optimization stitching model and effective algorithm are established based on simultaneous least-square fitting. A hyperboloid with an aperture of 350 mm is tested by this method. The obtained peak-to-valley （PV） and root-mean-square （RMS） values of the surface error after stitching are 0.433A and 0.052A （A is 632.8 nm）, respectively. The reconstructed surface map is coincide with the entire surface map from null test, and the difference of PV and RMS errors between them are 0.031A and 0.005A, respectively. This stitching model provides another quantitive method for testing large aspheric surfaces besides null compensation.
基金supported by the National Fund of Out-standing Talent (No.69925512)
文摘The free surface and unrotational-symmetric surface optical elements have been applied more and more widely along with the development of optical design technology, although they are still difficult for manufacturing. In this letter, a SiC unrotational-symmetric aspheric surface whose surface equation is z =- 3λ（x^a ＋ y^3） （λ= 0.6328μm） has been introduced. The tilt abstraction is adopted to minimize the material removal. The surface figures are peak-to-valley （PV） value of 0.327A and root-mean-square （RMS） value of 0.023A. A non-null testing method based on digital mask is proposed to test this surface. The accuracy of the method is testified by the experiment of standard sphere testing.
