Beam Smoothing Scheme for Multi-Color Laser Quad Based on a Combination of Hybrid Gratings

Jian Wang; Zheqiang Zhong; Bin Zhang; Nianchun Sun

doi:10.3788/AOS201838.0814001

Journals >Acta Optica Sinica >Volume 38 >Issue 8 >Page 0814001 > Article

Acta Optica Sinica
Vol. 38, Issue 8, 0814001 (2018)

Beam Smoothing Scheme for Multi-Color Laser Quad Based on a Combination of Hybrid Gratings

Jian Wang^*, Zheqiang Zhong, Bin Zhang^*, and Nianchun Sun

Author Affiliations

College of Electronics and Information Engineering, Sichuan University, Chengdu, Sichuan 610064, China

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DOI: 10.3788/AOS201838.0814001 Cite this Article Set citation alerts

Jian Wang, Zheqiang Zhong, Bin Zhang, Nianchun Sun. Beam Smoothing Scheme for Multi-Color Laser Quad Based on a Combination of Hybrid Gratings[J]. Acta Optica Sinica, 2018, 38(8): 0814001 Copy Citation Text

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Fig. 1. (a) Beam smoothing scheme for multi-color laser quad based on a combination of hybrid gratings; (b) structure of hybrid grating

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Fig. 2. (a) Model of transverse moving speed of the speckles on target plane; (b) combined speed of the speckles on the target plane

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Fig. 3. Transverse moving speed of the speckles on target plane. (a) v1 and v2; (b) combined speed v

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Fig. 4. Smoothing effect of different combinations of hybrid gratings. (a) Variation of luminous flux contrast with integration time; (b) FOPAI curves

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Fig. 5. Focused intensity distributions and related FOPAI curves. (a) Scheme 1, C=0.76; (b) scheme 2, C=0.58; (c) scheme 3, C=0.60; (d) FOPAI curves

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Fig. 6. Intensity distributions of the propagation of longitudinal laser quad and related longitudinal PSD curves. (a) Scheme 1; (b) scheme 2; (b) scheme 3; (d) longitudinal PSD curves

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Combination	$\begin{matrix} \frac{d θ_{1}}{d λ_{1}} \end{matrix}$	$\begin{matrix} \frac{d θ_{2}}{d λ_{2}} \end{matrix}$	$\begin{matrix} \frac{d θ_{3}}{d λ_{3}} \end{matrix}$	$\begin{matrix} \frac{d θ_{4}}{d λ_{4}} \end{matrix}$
a	558 (M=20000)	558(M=20000)	558(M=20000)	558(M=20000)
b	558(M=20000)	840(M=40000)	558(M=20000)	840(M=40000)
c	840(M=40000)	1120(M=60000)	840(M=40000)	1120(M=60000)
d	1120(M=60000)	1400(M=80000)	1120(M=60000)	1400(M=80000)
e	558	558	698	698

Table 1. Parameters of each grating in different combinations of hybrid gratingsμrad·nm-1

Scheme	$\begin{matrix} \frac{d θ_{1}}{d λ_{1}} \end{matrix}$ /(μrad·nm^-1)	$\begin{matrix} \frac{d θ_{2}}{d λ_{2}} \end{matrix}$ /(μrad·nm^-1)	$\begin{matrix} \frac{d θ_{3}}{d λ_{3}} \end{matrix}$ /(μrad·nm^-1)	$\begin{matrix} \frac{d θ_{4}}{d λ_{4}} \end{matrix}$ /(μrad·nm^-1)	Dispersion direction
1	558	558	558	558	Same
2	558	558	698	698	Orthogonal
3	840(M=40000)	1120(M=60000)	840(M=40000)	1120(M=60000)	Orthogonal

Table 2. Parameters of each grating in three typical schemes of sub grating element

Jian Wang, Zheqiang Zhong, Bin Zhang, Nianchun Sun. Beam Smoothing Scheme for Multi-Color Laser Quad Based on a Combination of Hybrid Gratings[J]. Acta Optica Sinica, 2018, 38(8): 0814001

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