Acta Photonica Sinica, Volume. 52, Issue 5, 0552216(2023)

Analysis of Collimation Errors in Off-axis Parabolic Reflective Fiber Collimators

Liang TANG1...2,*, Huiqi YE1,2, Zhibo HAO1,2, and Dong XIAO1,23 |Show fewer author(s)
Author Affiliations
  • 1National Astronomical Observatories/Nanjing Institute of Astronomical Optics & Technology, Chinese Academy of Sciences, Nanjing 210042, China
  • 2CAS Key Laboratory of Astronomical Optics & Technology, Nanjing Institute of Astronomical Optics & Technology, Nanjing 210042, China
  • 3University of Chinese Academy of Sciences, Beijing 100049, China
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    Figures & Tables(19)
    The ideal(dotted line)and realistic(solid line)transmission peak of an FP Etalon
    Spectral images taken by the 2.16-HRS spectrograph of the same FP etalon under different illumination
    Illustration of the off-axis parabolic reflective collimator
    Illustration of fiber position
    Flow chart of the simulation process
    Angular energy distribution of the output beam without any fiber positioning error(OAP collimators with 16.5 mm PFL)
    Angular energy distribution of the output beam without any fiber positioning error(OAP collimators with the same off-axis angle and different PFL,or different off-axis angle and the same RFL)
    Influence of ±10 mrad rotation fiber positioning error around the yf-axis(pitch)on the angular energy distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of ±10 mrad rotation fiber positioning error around the xf-axis(roll)on the angular energy distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of ±10 μm shift fiber positioning error along the xf-axis(Δx)on the angular energy distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of ±10 μm shift fiber positioning error along the yf-axis(Δy)on the angular energy distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of ±10 μm shift fiber positioning error along the zf-axis(Δz)on the angular energy distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of rotation + Δx shift fiber positioning errors on the angular distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of rotation + Δy shift fiber positioning errors on the angular distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    Influence of rotation + Δz shift fiber positioning errors on the angular distribution of the output beam(OAP collimator with 90o off-axis angle,16.5 mm PFL)
    • Table 1. Fiber output parameters used in the simulation

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      Table 1. Fiber output parameters used in the simulation

      Fiber typeNear-field distribution(F/4 input)Far-field distribution(F/4 input)
      MMF(200 μm core diameter,NA~0.22)MeasuredMeasured
      MMF(100 μm core diameter,NA~0.22)MeasuredMeasured
      SMF(4.2 μm mode diameter,NA~0.12)MeasuredMeasured
    • Table 2. Off-axis parabolic mirror parameters used in the simulation

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      Table 2. Off-axis parabolic mirror parameters used in the simulation

      Off-axis angle θ/(°)Parental focal length fP/mmReflective focal length fR/mm
      9016.533.000
      4516.519.330
      1516.516.786
      9025.450.800
      4543.450.846
      907.515.000
    • Table 3. Fiber positioning error parameters used in the simulation

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      Table 3. Fiber positioning error parameters used in the simulation

      Rotation error(yaw/zf -axis,pitch/yf -axis,roll/xf -axis)Shift error(Δx,Δy,Δz
      (0,0,0)(0,0,0)
      (0,0~±10 mrad,0)(0~±10 μm,0,0)
      (0,0,0~ ±10 mrad)(0,0~±10 μm,0)
      (0,0,0~±10 μm)
    • Table 4. Angular energy distribution variation under different combinations of fiber positioning errors for OAP collimators with the same RFL,different off-axis angle and PFL

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      Table 4. Angular energy distribution variation under different combinations of fiber positioning errors for OAP collimators with the same RFL,different off-axis angle and PFL

      Fiber typeFiber positioning errors(in mrad or μm)OAPDistributionBarycenter
      Off-axis angle/oPFL/mm(RFL/mm)Mean/mradStandard deviation/mradx/mradz/mrad
      200 μm MMF

      rot(0,0,0)

      sh(0,0,0)

      9025.4(50.8)1.2994.675×10-1~01.890×10-3
      4543.4(50.8)1.2954.596×10-1~09.182×10-4

      rot(0,0,10)

      sh(-10,0,0)

      9025.4(50.8)

      1.322

      (+2.300×10-2

      4.857×10-1

      (+1.820×10-2

      1.487×10-1

      (+1.487×10-1

      1.943×10-3

      (+5.3×10-5

      4543.4(50.8)

      1.310

      (+1.500×10-2

      4.751×10-1

      (+1.55×10-2

      1.823×10-1

      (+1.823×10-1

      9.281×10-4

      (+9.9×10-6

      rot(0,0,-10)

      sh(0,0,0)

      9025.4(50.8)

      1.286

      (-1.300×10-2

      4.630×10-1

      (-4.5×10-3

      ~0(-0)

      1.866×10-3

      (-2.4×10-5

      4543.4(50.8)

      1.290

      (-5.000×10-3

      4.577×10-1

      (-1.9×10-3

      ~0(+0)

      9.227×10-4

      (+4.5×10-6

      rot(0,10,0)

      sh(0,0,10)

      9025.4(50.8)1.299(+0)

      4.676×10-1

      (+1×10-4

      1.466×10-3

      (+1.466×10-3

      3.087×10-4

      (-1.581×10-3

      4543.4(50.8)1.295(+0)

      4.597×10-1

      (+1×10-4

      1.813×10-3

      (+1.813×10-3

      1.457×10-4

      (-7.725×10-4

      rot(0,10,0)

      sh(0,0,-10)

      9025.4(50.8)1.299(+0)

      4.676×10-1

      (+1.000×10-4

      -1.428×10-3

      (-1.428×10-3

      3.472×10-3

      (+1.582×10-3

      4543.4(50.8)1.295(+0)

      4.597×10-1

      (+1.000×10-4

      -1.787×10-3

      (-1.787×10-3

      1.691×10-3

      (+7.728×10-4

      SMF

      rot(0,0,0)

      sh(0,0,0)

      9025.4(50.8)2.067×10-28.878×10-3~05.040×10-7
      4543.4(50.8)2.064×10-28.807×10-3~02.453×10-7

      rot(0,0,10)

      sh(-10,0,0)

      9025.4(50.8)

      1.992×10-1

      (+1.785×10-1

      1.864×10-2

      (+9.762×10-3

      1.490×10-1

      (+1.490×10-1

      2.976×10-5

      (+2.926×10-5

      4543.4(50.8)

      1.977×10-1

      (+1.771×10-1

      1.638×10-2

      (+7.573×10-3

      1.827×10-1

      (+1.827×10-1

      1.490×10-5

      (+1.465×10-5

      rot(0,0,-10)

      sh(0,0,0)

      9025.4(50.8)

      2.047×10-2

      (-2.000×10-4

      8.791×10-3

      (-8.700×10-5

      ~0(+0)

      4.977×10-7

      (-6.300×10-9

      4543.4(50.8)

      2.055×10-2

      (-9.000×10-5

      8.771×10-3

      (-3.6×10-5

      ~0(+0)

      2.465×10-7

      (+1.200×10-9

      rot(0,10,0)

      sh(0,0,10)

      9025.4(50.8)

      2.367×10-2

      (+3.000×10-3

      1.140×10-2

      (+2.522×10-3

      1.456×10-3

      (+1.456×10-3

      -9.240×10-4

      (-9.245×10-4

      4543.4(50.8)

      2.362×10-2

      (+2.980×10-3

      1.130×10-2

      (+2.493×10-3

      1.809×10-3

      (+1.809×10-3

      -4.515×10-4

      (-4.517×10-4

      rot(0,10,0)

      sh(0,0,-10)

      9025.4(50.8)

      2.367×10-2

      (+3.000×10-3

      1.140×10-2

      (+2.522×10-3

      -1.456×10-3

      (-1.456×10-3

      9.254×10-4

      (+9.249×10-4

      4543.4(50.8)

      2.362×10-2

      (+2.980×10-3

      1.130×10-2

      (+2.493×10-3

      -1.809×10-3

      (-1.809×10-3

      4.522×10-4

      (+4.520×10-4

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    Liang TANG, Huiqi YE, Zhibo HAO, Dong XIAO. Analysis of Collimation Errors in Off-axis Parabolic Reflective Fiber Collimators[J]. Acta Photonica Sinica, 2023, 52(5): 0552216

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    Paper Information

    Category: Special Issue for Advanced Science and Technology of Astronomical Optics

    Received: Dec. 27, 2022

    Accepted: Feb. 2, 2023

    Published Online: Jul. 19, 2023

    The Author Email: TANG Liang (ltang@niaot.ac.cn)

    DOI:10.3788/gzxb20235205.0552216

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