Defocus Study of a Novel Optical Antenna Illuminated by a Radial Radiation Fiber Laser

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  • ABSTRACT

    A novel antenna with ellipsoid-paraboloid surfaces configuration is designed for matching the incident radial radiation fiber laser distribution for maximum transmission efficiency. The on-axial and off-axial defocus effects on the optical antenna system, resulting in energy loss, are analyzed in detail. Knowledge of the effects of those defocuses on beam divergence, aberration and antenna transmission efficiency is of great importance to the long range communication systems.


  • KEYWORD

    Radial radiation fiber laser , Ellipsoid-paraboloid surfaces , On-axial defocus , Off-axial defocus , Receiving efficiency

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  • [FIG. 1.] Model of Cassegrain antenna and energy distributions. (a) The schematic illustration of central reflection caused by the secondary mirror, (b) energy distribution of the input Gaussian beam, (c) energy distribution of the truncated Gaussian beam emits from antenna.
    Model of Cassegrain antenna and energy distributions. (a) The schematic illustration of central reflection caused by the secondary mirror, (b) energy distribution of the input Gaussian beam, (c) energy distribution of the truncated Gaussian beam emits from antenna.
  • [Fig. 2.] Schematic illustration of novel optical emitting antenna illuminated by a radial radiation fiber laser. (a) Configuration of emitting antenna with ellipsoid-paraboloid mirror surfaces and (b) the cross section of the emitting laser beam.
    Schematic illustration of novel optical emitting antenna illuminated by a radial radiation fiber laser. (a) Configuration of emitting antenna with ellipsoid-paraboloid mirror surfaces and (b) the cross section of the emitting laser beam.
  • [FIG. 3.] Two-dimensional structure of the ellipsoid mirror.
    Two-dimensional structure of the ellipsoid mirror.
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  • [FIG. 4.] Two-dimensional structure of the ellipsoid-paraboloid mirrors.
    Two-dimensional structure of the ellipsoid-paraboloid mirrors.
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  • [FIG. 5.] Simulation results of the confocal optical emitting antenna, the coordinate of the parabola apex is , p=375 cm, a=75 cm, b=50 cm, and the azimuthal angle of the edge light emitted from the radial radiation fiber laser is θ=30°. (a) Two-dimensional ray tracing of the confocal optical emitting antenna. (b) The curves of the divergence angles of inner and outer edge laser beam emitted from confocal optical emitting antenna change with radial radiation azimuthal angle θ, the observation plane is at position of x=100 cm.
    Simulation results of the confocal optical emitting antenna, the coordinate of the parabola apex is , p=375 cm, a=75 cm, b=50 cm, and the azimuthal angle of the edge light emitted from the radial radiation fiber laser is θ=30°. (a) Two-dimensional ray tracing of the confocal optical emitting antenna. (b) The curves of the divergence angles of inner and outer edge laser beam emitted from confocal optical emitting antenna change with radial radiation azimuthal angle θ, the observation plane is at position of x=100 cm.
  • [FIG. 6.] Two-dimensional ray tracing simulation results and curves of the divergence angles of the edge emitting ray from emitting antenna models vs. different on-axial defocusing amounts. The observation plane is at position of x = 100 cm. (a) Two-dimensional ray tracing simulation result of on-axial defocusing amount s = ?25 cm and (b) on-axial defocusing amount s = 25 cm, (c) the curves of the divergence angles of the edge emitting light vs. on-axial defocusing amount s changes from ?50 cm to 50 cm.
    Two-dimensional ray tracing simulation results and curves of the divergence angles of the edge emitting ray from emitting antenna models vs. different on-axial defocusing amounts. The observation plane is at position of x = 100 cm. (a) Two-dimensional ray tracing simulation result of on-axial defocusing amount s = ?25 cm and (b) on-axial defocusing amount s = 25 cm, (c) the curves of the divergence angles of the edge emitting light vs. on-axial defocusing amount s changes from ?50 cm to 50 cm.
  • [FIG. 7.] Two-dimensional ray tracing simulation results and curves of the deviation angles of the edge emitting light of emitting antenna models vs. different off-axial defocusing amounts. (a) Two-dimensional ray tracing simulation result of off-axial defocusing amount t = ?17 cm and (b) off-axial defocusing amount t = 17 cm, (c) the curves of the deviation angles of the edge emitting light vs. off-axial defocusing amount t change from ?50 cm to 50 cm.
    Two-dimensional ray tracing simulation results and curves of the deviation angles of the edge emitting light of emitting antenna models vs. different off-axial defocusing amounts. (a) Two-dimensional ray tracing simulation result of off-axial defocusing amount t = ?17 cm and (b) off-axial defocusing amount t = 17 cm, (c) the curves of the deviation angles of the edge emitting light vs. off-axial defocusing amount t change from ?50 cm to 50 cm.
  • [Fig. 8.] Curves for defocusing amounts vs. emission efficiency of emitting antenna. (a) Curves of negative defocusing amounts vs. emission efficiency. (b) Curves of positive defocusing amounts vs. emission efficiency.
    Curves for defocusing amounts vs. emission efficiency of emitting antenna. (a) Curves of negative defocusing amounts vs. emission efficiency. (b) Curves of positive defocusing amounts vs. emission efficiency.
  • [FIG. 9.] Spot diagrams with different defocusing amounts. (a) On-axial defocusing amount is s = 0, (b) s = ?28 cm, (c) s = ?50 cm. (d) Off-axial defocusing amount is t = ?17.5 cm, (e) t = ?28 cm, (f) t = ?50 cm.
    Spot diagrams with different defocusing amounts. (a) On-axial defocusing amount is s = 0, (b) s = ?28 cm, (c) s = ?50 cm. (d) Off-axial defocusing amount is t = ?17.5 cm, (e) t = ?28 cm, (f) t = ?50 cm.
  • [FIG. 10.] Simulation results of emitting antenna aberration. (a) Spot diagram at the Gaussian plane for the confocal case and (b) coma aberration of emitting antenna with off-axial defocusing amount is t = 1 cm, (c) coma and astigmatism aberrations of emitting antenna with off-axial defocusing amount is t = 17 cm.
    Simulation results of emitting antenna aberration. (a) Spot diagram at the Gaussian plane for the confocal case and (b) coma aberration of emitting antenna with off-axial defocusing amount is t = 1 cm, (c) coma and astigmatism aberrations of emitting antenna with off-axial defocusing amount is t = 17 cm.
  • [FIG. 11.] Schematic diagram of Cassegrain antenna and effective receiving plane. (a) Structure of receiving antenna and (b) effective receiving plane.
    Schematic diagram of Cassegrain antenna and effective receiving plane. (a) Structure of receiving antenna and (b) effective receiving plane.
  • [FIG. 12.] Spot diagram on the effective receiving plane at x = 5000 m with different defocusing amounts, (a) s = ?0. 5 mm (b) s = 0 mm, (c) s = 0.2 mm, (d) t = 0.1 mm, (e) t = 0.2 mm, (f) t = 0.3 mm.
    Spot diagram on the effective receiving plane at x = 5000 m with different defocusing amounts, (a) s = ?0. 5 mm (b) s = 0 mm, (c) s = 0.2 mm, (d) t = 0.1 mm, (e) t = 0.2 mm, (f) t = 0.3 mm.
  • [Fig. 13] Relationship between receiving efficiency and transmission distance L. (a) Curves of receiving efficiency vs. transmission distance L with different on-axial defocusing s, (b) curves of receiving efficiency vs. transmission distance L with different off-axial defocusing t.
    Relationship between receiving efficiency and transmission distance L. (a) Curves of receiving efficiency vs. transmission distance L with different on-axial defocusing s, (b) curves of receiving efficiency vs. transmission distance L with different off-axial defocusing t.
  • [FIG. 14.] Curves of off-axial defocusing t vs. receiving efficiency at different transmission distance L in long range optical communication, (a) three-dimensional distribution (b) two-dimensional distribution.
    Curves of off-axial defocusing t vs. receiving efficiency at different transmission distance L in long range optical communication, (a) three-dimensional distribution (b) two-dimensional distribution.