Design of Variable Spot and Zoom Optical System for Laser Cutting

Jiaqi Ge; Yingxiong Qin; Xiaodong Liu; Xiahui Tang

doi:10.3788/AOS201939.0222001

Acta Optica Sinica, Volume. 39, Issue 2, 0222001(2019)

Design of Variable Spot and Zoom Optical System for Laser Cutting

Jiaqi Ge^1,2、*, Yingxiong Qin^1,2、*, Xiaodong Liu^1,2, and Xiahui Tang^1,2

¹ National Engineering Research Center for Laser Processing, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, Hubei 430074, China

² Research Institute of Huazhong University of Science and Technology in Shenzhen, Shenzhen, Guangdong 518057, China

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Figures & Tables(19)

Fig. 1. Laser cutting system with two lens

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Fig. 2. Zoom beam expander system

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Fig. 3. Variable spot and zoom laser system with five lens

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Fig. 4. Variable spot and zoom laser system with four lens

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Fig. 5. Principle of beam expander system

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Fig. 6. Geometric locus of zoom group and compensated group

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Fig. 7. Simulation results with MATLAB software

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Fig. 8. Amplification diagram of focal spot

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Fig. 9. Change of focal movement distance with the movement distance of compensated group

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Fig. 10. Optical system, focusing surface spot, and wavefront aberration with different magnifications

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Table 1. Change of all items when zoom group is moved
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Table 1. Change of all items when zoom group is moved
d₁ d₂ f'₁₂ M
0<d₁<f'₁+f'₂,d₁↑ d₂<f'₃,d₂↓ f'₁₂<0, |f'₁₂|↑ ↓
f'₁+ $f_{2}^{'}$ <d₁<f'₁,d₁↑ d₂>f'₃,d₂↓ f'₁₂>0,|f'₁₂|↓ ↑
d₁=f'₁ d₂=f'₃ f'₁₂=f'₁ M=|f'₃/f'₁|
f'₁+f'₂-d₁<f'₂ ,d₁↑ d₂<f'₃,d₂↓ f'₁₂>0 ,|f'₁₂|↓ ↑

Table 2. Values of d1 and d2 with different magnifications
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Table 2. Values of d1 and d2 with different magnifications
M k d₁ /mm d₂ /mm
0.4 3.750 64.53 17.00
0.6 2.500 60.80 52.00
0.8 1.875 57.07 69.00
1.0 1.500 53.33 80.07
1.2 1.250 49.60 87.00
1.4 1.070 45.87 92.00
1.5 1.000 44.00 94.00

Table 3. Coordinate positions of zoom group and compensated group with different magnifications
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Table 3. Coordinate positions of zoom group and compensated group with different magnifications
M k Coordinate position /mm
Zoom group Compensated group
0.4 3.750 164.53 181.53
0.6 2.500 160.80 212.80
0.8 1.875 157.07 226.07
1.0 1.500 153.33 233.40
1.2 1.250 149.60 236.60
1.4 1.070 145.87 237.87
1.5 1.000 144.00 238.00

Table 4. Parameters of fixed group calculated by Zemax software

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Table 4. Parameters of fixed group calculated by Zemax software

Item	Surface type	Radius /mm	Thickness /mm	Glass material	Conic coefficient
OBJ	Standard	Infinity	Infinity		0
STO	Standard	107.35	3.00	Silica	0
2	Standard	-85.81	1.00		0
3	Standard	39.17	3.00	Silica	-0.94
4	Standard	518.98	47.33		0
IMA	Standard	Infinity			0

Table 5. Parameters of zoom group calculated by Zemax magnification
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Table 5. Parameters of zoom group calculated by Zemax magnification
Item Surface type Radius /mm Thickness /mm Glass material Conic coefficient
OBJ Standard Infinity Infinity 0
STO Standard 2.94×10⁷ 2.00 Silica 0
2 Standard 13.04 -29.00 -2.10
IMA Standard Infinity 0

Table 6. Parameters of compensated group and focusing lens calculated by Zemax magnification

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Table 6. Parameters of compensated group and focusing lens calculated by Zemax magnification

Item	Surface type	Radius /mm	Thickness /mm	Glass material	Conic coefficient
OBJ	Standard	Infinity	Infinity		0
STO	Standard	98.94	5	Silica	0
2	Standard	58.34	2		1.86
3	Standard	38.68	5	Silica	0
4	Standard	240.66	144		0
IMA	Standard	Infinity			0

Table 7. Parameters of system after optimization

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Table 7. Parameters of system after optimization

Item	Surface type	Radius /mm	Thickness /mm	Glass material	Conic coefficient
OBJ	Standard	Infinity	Infinity		0
STO	Standard	107.35	3.00	Silica	0
2	Standard	-85.81	1.00		0
3	Standard	39.17	3.00	Silica	-0.94
4	Standard	518.98	39.38		0
5	Standard	-45.68	2.00	Silica	-22.44
6	Standard	17.43	87.12		0
7	Standard	703.05	5.00	Silica	0
8	Standard	95.62	2.00		0
9	Standard	76.59	5.00	Silica	0
10	Standard	-94.75	25.00		0
11	Standard	98.94	5.00	Silica	0
12	Standard	58.39	2.00		1.86
13	Standard	38.68	5.00	Silica	0
14	Standard	240.66	144.01		0
IMA	Standard	Infinity			0

Table 8. Values of d1 and d2 calculated at different magnification after optimization
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Table 8. Values of d1 and d2 calculated at different magnification after optimization
M k d₁/mm d₂/mm
0.4 3.750 60.27 11.17
0.6 2.500 55.75 50.26
0.8 1.875 50.28 70.42
1.0 1.500 45.34 80.07
1.2 1.250 42.10 84.33
1.4 1.070 40.08 86.45
1.5 1.000 39.38 87.12

Table 9. Tolerance parameters of this system
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Table 9. Tolerance parameters of this system
Front R /mm Back R /mm Thickness /mm Decenter X /mm Decenter Y /mm Tilt X Tilt Y
±0.15 ±0.15 ±0.15 ±0.15 ±0.15 ±0.1 ±0.1

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Jiaqi Ge, Yingxiong Qin, Xiaodong Liu, Xiahui Tang. Design of Variable Spot and Zoom Optical System for Laser Cutting[J]. Acta Optica Sinica, 2019, 39(2): 0222001

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Paper Information

Category: Optical Design and Fabrication

Received: Aug. 30, 2018

Accepted: Oct. 8, 2018

Published Online: May. 10, 2019

The Author Email:

DOI:10.3788/AOS201939.0222001

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Change of all items when zoom group is moved

Table 1. Change of all items when zoom group is moved

Table 2. Values of d1 and d2 with different magnifications

Table 2. Values of d1 and d2 with different magnifications

Table 3. Coordinate positions of zoom group and compensated group with different magnifications

Table 3. Coordinate positions of zoom group and compensated group with different magnifications

Table 4. Parameters of fixed group calculated by Zemax software

Table 4. Parameters of fixed group calculated by Zemax software

Table 5. Parameters of zoom group calculated by Zemax magnification

Table 5. Parameters of zoom group calculated by Zemax magnification

Table 6. Parameters of compensated group and focusing lens calculated by Zemax magnification

Table 6. Parameters of compensated group and focusing lens calculated by Zemax magnification

Table 7. Parameters of system after optimization

Table 7. Parameters of system after optimization

Table 8. Values of d1 and d2 calculated at different magnification after optimization

Table 8. Values of d1 and d2 calculated at different magnification after optimization

Table 9. Tolerance parameters of this system

Table 9. Tolerance parameters of this system