Configuration optimization of off-axis parabolic mirror for enhancing the focusability of a laser beam

Xiahui Zeng

doi:10.3788/COL202119.032601

Journals >Chinese Optics Letters >Volume 19 >Issue 3 >Page 032601 > Article

Chinese Optics Letters
Vol. 19, Issue 3, 032601 (2021)

Configuration optimization of off-axis parabolic mirror for enhancing the focusability of a laser beam

Xiahui Zeng^*

Author Affiliations

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

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DOI: 10.3788/COL202119.032601 Cite this Article Set citation alerts

Xiahui Zeng. Configuration optimization of off-axis parabolic mirror for enhancing the focusability of a laser beam[J]. Chinese Optics Letters, 2021, 19(3): 032601 Copy Citation Text

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Schematic illustration of reflection of the OAP and sketch of the Cartesian coordinate systems S (x, y, z) and S′(x′,y′,z′). Focus F of the OAP coincides with origins of the Cartesian coordinate systems. Inset shows beam propagation in the vicinity of focus F.

Fig. 1. Schematic illustration of reflection of the OAP and sketch of the Cartesian coordinate systems S (x, y, z) and S′(x′,y′,z′). Focus F of the OAP coincides with origins of the Cartesian coordinate systems. Inset shows beam propagation in the vicinity of focus F.

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Electromagnetic field intensity distributions focused by f/0.5 OAPs with h = 0 for (a1) |Ex′|2, (a2) |Ey′|2, (a3) |Ez′|2, (a4) |E′|2, (a5) |Hx′|2, (a6) |Hy′|2, (a7) |Hz′|2, (a8) |H′|2, and h = 360 mm for (b1)–(b8) with corresponding electromagnetic field components and the total field to (a1)–(a8).

Fig. 2. Electromagnetic field intensity distributions focused by f/0.5 OAPs with h = 0 for (a1)

{| E_{x}^{'} |}^{2}

, (a2)

{| E_{y}^{'} |}^{2}

, (a3)

{| E_{z}^{'} |}^{2}

, (a4)

{| E^{'} |}^{2}

, (a5)

{| H_{x}^{'} |}^{2}

, (a6)

{| H_{y}^{'} |}^{2}

, (a7)

{| H_{z}^{'} |}^{2}

, (a8)

{| H^{'} |}^{2}

, and h = 360 mm for (b1)–(b8) with corresponding electromagnetic field components and the total field to (a1)–(a8).

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Fig. 3. Focused electric field intensity transverse distributions of (a)

{| E_{x}^{'} |}^{2}

, (b)

{| E_{z}^{'} |}^{2}

, (c)

{| E_{y}^{'} |}^{2}

, (d)

{| E^{'} |}^{2}

, and (e) peak intensity as functions of offset h, and (f) total field

{| E^{'} |}^{2}

for different h of 0 mm, 150 mm, 234 mm, and 360 mm. (g)(h) Intensity profiles for h = 0 and 234 mm in the lateral position between −3λ and 3λ.

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Fig. 4. Peak intensity of electric total field focused by OAPs with different f as a function of offset h for various aperture sizes R of (a) 80 mm, (b) 120 mm, and (c) 160 mm. The dotted line represents the position of h = 1.25R.

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Fig. 5. Offset of OAP in the optimum configuration, resulting in achievement of the maximum peak intensity, as a function of the parabola f-number.

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Fig. 6. Tolerances of (a) OAP offset and (b) off-axis angle to a 5% decrease of the maximum focused peak intensity as functions of the parabola f-number.

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Xiahui Zeng. Configuration optimization of off-axis parabolic mirror for enhancing the focusability of a laser beam[J]. Chinese Optics Letters, 2021, 19(3): 032601

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