• Chinese Optics Letters
  • Vol. 14, Issue 10, 100801 (2016)
Tong Yang, Jun Zhu*, and Guofan Jin
Author Affiliations
  • State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
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    DOI: 10.3788/COL201614.100801 Cite this Article Set citation alerts
    Tong Yang, Jun Zhu, Guofan Jin, "Design of a freeform, dual fields-of-view, dual focal lengths, off-axis three-mirror imaging system with a point-by-point construction-iteration process," Chin. Opt. Lett. 14, 100801 (2016) Copy Citation Text show less

    Abstract

    In this Letter, we propose a novel configuration and design method of freeform, dual fields-of-view (FOVs), dual focal lengths, off-axis three-mirror zoom imaging systems. The switch of the two zooms is achieved by rotating a single mirror element. The design of a freeform, dual focal lengths zoom system is realized by a point-by-point design approach for the first time to our knowledge. This method enables the direct design of freeform surfaces from initial planes using given system specifications and configuration, and the designed system can be taken as a good starting point for further optimization. A freeform, dual FOVs, dual focal lengths, off-axis three-mirror zoom system is demonstrated. The F-numbers of the two zooms are 2 and 2.4. The dual FOVs are 3°×3° and 2.5°×2.5°. After final optimization, both of the zooms achieve high performances.
    l3ϕ=12d1c12d2c2+2d2c1+4d1d2c1c2,(1)

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    ϕ=2c3l3ϕ+2c12c2+4d1c1c2,(2)

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    l3ϕz1=12d1,z1c12d2,z1c2,z1+2d2,z1c1+4d1,z1d2,z1c1c2,z1,(3)

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    ϕz1=2c3l3ϕz1+2c12c2,z1+4d1,z1c1c2,z1,(4)

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    l3ϕz2=12d1,z2c12d2,z2c2,z2+2d2,z2c1+4d1,z2d2,z2c1c2,z2,(5)

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    ϕz2=2c3l3ϕz2+2c12c2,z2+4d1,z2c1c2,z2.(6)

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    d1,z1=d1,z2Δandd2,z1=d2,z2+Δ.(7)

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    Tong Yang, Jun Zhu, Guofan Jin, "Design of a freeform, dual fields-of-view, dual focal lengths, off-axis three-mirror imaging system with a point-by-point construction-iteration process," Chin. Opt. Lett. 14, 100801 (2016)
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