Influence of Misalignment on Properties of Focused Laser Beam by Large Aperture Off-Axis Parabolic Mirror

Fig. 2. Three-dimensional propagation of a parallel light focused by OAP without misalignment. (a) Field intensity distribution in the $x^{'} - y^{'}$ plane at different axial positions $z^{'} = - 40 λ$ , $- 20 λ$ , $0 λ$ , $20 λ$ , and $40 λ$ ; (b) longitudinal transmission of light in the sagittal plane $- 120 λ \leq z^{'} \leq 120 λ$ and $- 10 λ \leq y^{'} \leq 10 λ$ after the light is reflected and focused by the OAP; (c) longitudinal transmission of light in the meridian plane $- 120 λ \leq z^{'} \leq 120 λ$ ， $- 10 λ \leq x^{'} \leq 10 λ$ after the light is reflected and focused by the OAP

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Fig. 3. Propagation of a parallel light focused by OAP with translational motion of 20λ along $x^{″}$ - or $y^{″}$ -axis. (a) $x^{″}$ -axis； (b) $y^{″}$ -axis

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Fig. 4. Propagation of a parallel light focused by OAP with rotation of 10 $°$ around $z^{″}$ axis

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Fig. 5. Propagation of a parallel light focused by OAP with rotation of 0.016° around $y^{″}$ axis

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Fig. 6. Field intensity distribution in geometric focal plane with different OAP offsets, aperture sizes， and rotation angles. (a) $h = 960 m m$ , $R = 160 m m$ , $α = 0.016 °$ ; (b) $h = 295 m m$ , $R = 160 m m$ , $α = 0.016 °$ ; (c) $h = 295 m m$ , $R = 260 m m$ , $α = 0.016 °$ ; (d) $h = 295 m m$ , $R = 160 m m$ , $α = 0.040 °$

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$Field intensity distribution of parallel light in meridian diffraction focal plane (MP), geometric focal plane （GP）, and sagittal diffraction focal plane (SP) after passing OAP with different offsets and rotation of 0.016° around y″ axis, and curve of light intensity distribution in corresponding planes. (a1)‒(a5) Off-axis height h=1600 mm of parallel light polarized along x direction; (b1)‒(b5) off-axis height h=960 mm of parallel light polarized along x direction; (c1)‒(c5) off-axis height h=295 mm of parallel light polarized along x direction; (d1)‒(d5) off-axis height h=295 mm of parallel light polarized along y direction$

Fig. 7. Field intensity distribution of parallel light in meridian diffraction focal plane (MP), geometric focal plane （GP）, and sagittal diffraction focal plane (SP) after passing OAP with different offsets and rotation of 0.016° around $y^{″}$ axis, and curve of light intensity distribution in corresponding planes. (a1)‒(a5) Off-axis height $h = 1600 m m$ of parallel light polarized along $x$ direction; (b1)‒(b5) off-axis height $h = 960 m m$ of parallel light polarized along $x$ direction; (c1)‒(c5) off-axis height $h = 295 m m$ of parallel light polarized along $x$ direction; (d1)‒(d5) off-axis height $h = 295 m m$ of parallel light polarized along $y$ direction

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$Field intensity distributions of parallel light in geometric focal plane and diffraction focal planes after passing OAP with different offsets and rotation of 0.016° around x″ axis$

Fig. 8. Field intensity distributions of parallel light in geometric focal plane and diffraction focal planes after passing OAP with different offsets and rotation of 0.016° around $x^{″}$ axis

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Fig. 9. When peak light intensity decreases by 10%, the corresponding maximum rotation angle around the axis. Relationship between (a) $α_{m a x}$ , (b) $β_{m a x}$ and OAP off-axis angle and the parabolic f number

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Fig. 10. Propagation of a parallel light focused by OAP with translational motion of 20λ along y" axis, and rotation of 0.016° around x" and y" axis, and rotation of 10^o around $z^{″}$ axis

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Fig. 11. Propagation of a parallel light focused by circle OAP with rotation of 0.016° around $y^{″}$ axis

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Xiahui Zeng. Influence of Misalignment on Properties of Focused Laser Beam by Large Aperture Off-Axis Parabolic Mirror[J]. Laser & Optoelectronics Progress, 2021, 58(11): 1114006

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Paper Information

Category: Lasers and Laser Optics

Received: Oct. 15, 2020

Accepted: Dec. 2, 2020

Published Online: Jun. 7, 2021

The Author Email: Xiahui Zeng (xiahuiz@126.com)

DOI:10.3788/LOP202158.1114006

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology