Study on Beam Width Narrowing of Blue Structured Light in Long Distance

Zhao-wen CAO; Zi-wei XU; Kuai-sheng ZOU

doi:10.3788/gzxb20204908.0814002

Journals >Acta Photonica Sinica >Volume 49 >Issue 8 >Page 0814002 > Article

Acta Photonica Sinica
Vol. 49, Issue 8, 0814002 (2020)

Study on Beam Width Narrowing of Blue Structured Light in Long Distance

Zhao-wen CAO^1、2, Zi-wei XU^1、2, and Kuai-sheng ZOU^1、2

Author Affiliations

¹School of Optoelectronic Science and Engineering, Soochow University, Suzhou, Jiangsu 215006, China

²Key Lab of Advanced Optical Manufacturing Technologies of Jinangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, Jiangsu 215006, China

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DOI: 10.3788/gzxb20204908.0814002 Cite this Article

Zhao-wen CAO, Zi-wei XU, Kuai-sheng ZOU. Study on Beam Width Narrowing of Blue Structured Light in Long Distance[J]. Acta Photonica Sinica, 2020, 49(8): 0814002 Copy Citation Text

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Abstract

A gradient-index lens with a diameter of 1.8 mm, a cylindrical lens with a diameter of 2.5 mm and a volume Bragg grating are designed and fabricated as an optical system for a commercial blue single-tube semiconductor laser with a fast axis full width at half maxima of 23°. The experimental results show that this scheme can achieve a beam width of 0.48 mm at a distance of 5.5 m from the system, and the beam width is less than 0.60 mm in 5.5±0.5 m nearly, which can provide a new solution for the selection of the measurement scheme of line structured light.

Keywords

Beam shaping Blue semiconductor laser diode Cylindrical lens Gradient-index Lens Volume Bragg Grating

$ {r_{\rm{p}}} = \sqrt {\frac{{{d_{\rm{s}}}^2{\rm{N}}{{\rm{A}}_{\rm{m}}}^2{a^2}}}{{{d_{\rm{s}}}^2{\rm{N}}{{\rm{A}}_{\rm{m}}}^2 + {a^2}}}} $

(1)

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$ z = \frac{1}{{\sqrt A }}\arctan \left[ {\frac{1}{{n(0)\sqrt A {d_{\rm{s}}}}}} \right] + \frac{{s{\rm \pi} }}{{\sqrt A }},s = 0,1, \cdots $

(2)

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$ {n^2}(r) = {n^2}(0)(1 - 0.115{r^2} + 0.013{r^4} + \cdots ) $

(3)

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(4)

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$ \left\{ \begin{array}{l} {q_1} = \frac{{{A_{\rm{m}}}{q_0} + {B_{\rm{m}}}}}{{{C_{\rm{m}}}{q_0} + {D_{\rm{m}}}}}\\ {q_0} = {\rm{j}}\frac{{{\rm \pi} \omega _0^2}}{\lambda }\\ \frac{1}{{{q_1}}} = \frac{1}{{{R_1}}} - {\rm{j}}\frac{\lambda }{{{\rm \pi} \omega _1^2}} \end{array} \right. $

(5)

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$ {\theta _{{\rm{out}}}} = {\theta _{{\rm{in}}}} + 2\arctan \frac{{({d_{\rm{s}}} + R)\sin {\theta _{{\rm{in}}}}}}{{R{n_{\rm{c}}}}} - 2\arctan \frac{{({d_{\rm{s}}} + R)\sin {\theta _{{\rm{in}}}}}}{R} $

(6)

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Zhao-wen CAO, Zi-wei XU, Kuai-sheng ZOU. Study on Beam Width Narrowing of Blue Structured Light in Long Distance[J]. Acta Photonica Sinica, 2020, 49(8): 0814002

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