Design of Integrated Lens Array Beam Shaping System

Fig. 2. Light intensity distribution of a single light emitting unit. (a) Far-field three-dimensional light intensity distribution; (b) two-dimensional projections of x-y surface

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Fig. 3. Structure diagram of integrated collimated beam expanding lens array shaping system

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Fig. 4. Structure diagram of integrated lens array

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Fig. 5. Schematic of aspheric lens collimation in fast axis direction

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Fig. 6. Schematic of aspheric lens beam expansion in slow axis direction

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Fig. 7. Structure diagram of beam collimation beam expansion system in Zemax

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Fig. 8. Result maps of integrated lens array shaping. (a) Normalized light intensity distribution map of incident beam; (b) normalized light intensity distribution map of outgoing beam; (c) optimized lens structure map

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Fig. 9. Relative light intensity distributions of LAOSL before and after shaping. Relative light intensity distribution in (a) fast axis direction of incident beam; (b) fast axis direction of outgoing beam; (c) slow axis direction of incident beam; (d) slow axis direction of outgoing beam

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Table 1. Design parameters of shaping system
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Table 1. Design parameters of shaping system
Parameter Value
Wavelength /nm 850
Field of view /（°） 45
Projection distance /mm 1000
Line width /mm <3
Energy utilization /% >80
Energy uniformity /% >90

Table 2. Initial structural parameters of LAOSL and aspheric lens

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Table 2. Initial structural parameters of LAOSL and aspheric lens

Laser diode array		Aspheric lens initial structure
Parameter	Value	Parameter	Value
$λ$ /nm	850	Object type	Biconic lens
Power /W	1	x-radius /µm	12
$θ_{S}$ /（°）	38	y-radius /µm	12
$θ_{F}$ /（°）	13.8	Thickness /µm	35
G_x	0.85	R_y₁	5.34
G_x	1	K_y₁	$-$ 2.301
x-width /µm	1	R_x₂	$-$ 3.55
y-width /µm	4	K_x₂	$-$ 2.301

Table 3. Parameters after optimization of aspheric collimation beam expanding lens arrays
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Table 3. Parameters after optimization of aspheric collimation beam expanding lens arrays
Parameter $x$ direction $y$ direction
Aperture of lens /µm 16 18
Thickness /µm 12 12
Radius of front surface $-$ 5.353
Radius of back surface -1.20 $-$
Conic of front surface $-$ -2.345
Conic of back surface -1.95 $-$

Table 4. Raw data for line beam sampling

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Table 4. Raw data for line beam sampling

Position /mm	Intensity	Position /mm	Intensity	Position /mm	Intensity	Position /mm	Intensity
-400	0.05213	-200	0.04141	10	0.03863	210	0.04939
-390	0.05147	-190	0.03924	20	0.03768	220	0.04054
-380	0.04820	-180	0.04126	30	0.03874	230	0.04114
…		…		…		…
-230	0.04184	-30	0.03766	180	0.03979	380	0.04887
-220	0.04096	-20	0.03795	190	0.04189	390	0.05252
-210	0.04126	-10	0.03852	200	0.04054	400	0.05102

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Pangyue Li, Shun Zhou, Jin Cheng, Yibo Zhao, Jiahao Liu, Weiguo Liu. Design of Integrated Lens Array Beam Shaping System[J]. Laser & Optoelectronics Progress, 2023, 60(15): 1514011

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