Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence

doi:10.1088/1674-1056/ab683e

中国物理B ›› 2020, Vol. 29 ›› Issue (3): 34202-034202.doi: 10.1088/1674-1056/ab683e

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇下一篇

Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence

Xia-Hui Zeng(曾夏辉), Xi-Yao Chen(陈曦曜)

Department of Physics&Electronic Information Engineering, Minjiang University, Fuzhou 350108, China

收稿日期:2019-10-17 修回日期:2019-12-03 出版日期:2020-03-05 发布日期:2020-03-05
通讯作者: Xia-Hui Zeng E-mail:xiahuiz@126.com
基金资助:
Project supported by the Science Foundation for Youth Scholars of Minjiang University, China (Grant No. Mj9n201602) and the National Science and Technology Major Project of the Ministry of Science and Technology of China.

Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence

Xia-Hui Zeng(曾夏辉), Xi-Yao Chen(陈曦曜)

Department of Physics&Electronic Information Engineering, Minjiang University, Fuzhou 350108, China

Received:2019-10-17 Revised:2019-12-03 Online:2020-03-05 Published:2020-03-05
Contact: Xia-Hui Zeng E-mail:xiahuiz@126.com
Supported by:
Project supported by the Science Foundation for Youth Scholars of Minjiang University, China (Grant No. Mj9n201602) and the National Science and Technology Major Project of the Ministry of Science and Technology of China.

摘要/Abstract

摘要： Based on a full vector-diffraction theory, a detailed theoretical study is carried out, aiming at providing a clear insight into the effects of different focusing and off-axis parabola parameters on far-field vector-diffraction properties of an off-axis parabolic mirror in the presence of misalignments of the incoming beam. The physical origin of these effects is also explored. The results show that the far-field intensity profile is altered by the distortion-, coma-, and astigmatism-like aberrations, which are caused by oblique incidence rather than inherent aberrations for the off-axis configuration. The radius of 90% encircled energy also increases but does not change monotonically with incident beam size increasing, or rather, it first decreases and then increases. The focal shift strongly depends on the effective focal length and oblique incidence angle, but it is almost independent of the beam size, which affects the focusing spot patterns. The intensity distribution produces a higher astigmatic image with off-axis angle increasing. Coma-like aberration starts to become dominant with beam size increasing and results in larger curved propagation trajectory. The incident polarization also affects the intensity distribution. The variation in the Strehl ratio with oblique incidence angle strongly depends on the misalignment direction and beam size as well. In addition, we find that the difference in locus between the catacaustic and the diffraction focus in the meridian is small. But the locus of the sagittal foci is obviously different from the locus of the meridian foci and the catacaustic focus. Moreover, the peak intensity of the sagittal focus is maximum, and the ratio of the peak intensity to that in the meridian plane is approximately 1.5. Understanding these effects is valuable for assessing a practical focused intensity and describing the motion of charged particles under a strong electric field in ultraintense laser-matter interaction.

关键词: laser beam focusing, off-axis parabolic mirror, vector-diffraction theory, oblique incidence

Abstract: Based on a full vector-diffraction theory, a detailed theoretical study is carried out, aiming at providing a clear insight into the effects of different focusing and off-axis parabola parameters on far-field vector-diffraction properties of an off-axis parabolic mirror in the presence of misalignments of the incoming beam. The physical origin of these effects is also explored. The results show that the far-field intensity profile is altered by the distortion-, coma-, and astigmatism-like aberrations, which are caused by oblique incidence rather than inherent aberrations for the off-axis configuration. The radius of 90% encircled energy also increases but does not change monotonically with incident beam size increasing, or rather, it first decreases and then increases. The focal shift strongly depends on the effective focal length and oblique incidence angle, but it is almost independent of the beam size, which affects the focusing spot patterns. The intensity distribution produces a higher astigmatic image with off-axis angle increasing. Coma-like aberration starts to become dominant with beam size increasing and results in larger curved propagation trajectory. The incident polarization also affects the intensity distribution. The variation in the Strehl ratio with oblique incidence angle strongly depends on the misalignment direction and beam size as well. In addition, we find that the difference in locus between the catacaustic and the diffraction focus in the meridian is small. But the locus of the sagittal foci is obviously different from the locus of the meridian foci and the catacaustic focus. Moreover, the peak intensity of the sagittal focus is maximum, and the ratio of the peak intensity to that in the meridian plane is approximately 1.5. Understanding these effects is valuable for assessing a practical focused intensity and describing the motion of charged particles under a strong electric field in ultraintense laser-matter interaction.

Key words: laser beam focusing, off-axis parabolic mirror, vector-diffraction theory, oblique incidence

中图分类号: (Wave optics)

42.25.-p

42.25.Fx (Diffraction and scattering) 42.60.Jf (Beam characteristics: profile, intensity, and power; spatial pattern formation)

曾夏辉, 陈曦曜. Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence[J]. 中国物理B, 2020, 29(3): 34202-034202.

Xia-Hui Zeng(曾夏辉), Xi-Yao Chen(陈曦曜). Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence[J]. Chin. Phys. B, 2020, 29(3): 34202-034202.

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Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence

Far-field vector-diffraction of off-axis parabolic mirror under oblique incidence

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