Large Relative Aperture Receiving Optical System and Stray Light Suppression for Laser Ranging

Xingyu Zhou; Liang Sun; Qiao Pan; Shaolong Wu; Guoyang Cao; Xiaofeng Li

doi:10.3788/LOP230451

Laser & Optoelectronics Progress, Volume. 61, Issue 5, 0528001(2024)

Large Relative Aperture Receiving Optical System and Stray Light Suppression for Laser Ranging

Xingyu Zhou^1,2,3,4, Liang Sun^1,2,3,4, Qiao Pan^1,2,3,4, Shaolong Wu^1,2,3,4, Guoyang Cao^1,2,3,4、*, and Xiaofeng Li^1,2,3,4、**

Author Affiliations

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

²Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou 215006, China

³Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province, Soochow University, Suzhou 215006, China

⁴Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou 215006, China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(17)

Fig. 1. Light trace of receiving optical system for laser ranging

Download full size

Fig. 2. Galileo and Kepler type receiving optical systems

Download full size

Fig. 3. Initial structure of the receiving optical system for laser ranging

Download full size

Fig. 4. Final optimized structure of the receiving optical system for laser ranging

Download full size

Fig. 5. Final optimization performance of receiving optical system. (a) Spot diagrams; (b) footprint diagram of APD detecting surface in the view field; (c) enclosed energy curves

Download full size

Fig. 6. Schematic diagrams of the stray light suppression structure. (a) Schematic diagram of the light shield; (b) schematic diagram of the light fence in the lens barrel

Download full size

Fig. 7. Design of optical mechanical system. (a) Lens tube structure 1; (b) lens tube structure 2 (including light shield and inner fence)

Download full size

Fig. 8. R_PST of lens tube structure 1 and lens tube structure 2 (including light shield and inner fence) in 5°‒85° stray light tracing

Download full size

Fig. 9. Test system and target. (a) Total system; (b) ranging target

Download full size

Fig. 10. Echo signal amplitude of laser ranging system at various distances under different conditions

Download full size

Table 1. Recent advances in receiving optical systems for laser ranging

View table

Table 1. Recent advances in receiving optical systems for laser ranging

Parameter	Value
Optical type	T	T	T	T	R	T
Number of lenses	3	3	4	5	7	4
Diameter of entrance pupil D /mm	38	32	22	35	92	120
Field 2ω /mrad	10	5	6	7	4	1
Lagrange invariant J /（mrad·mm）	95	40	33	61.25	92	30
Relative aperture	1∶1.4	1∶2.2	1∶3.8	1∶1.8	1∶1.7	1∶0.6
Total length L /mm	76.7	86.6	94.1	143.5	170	108
Focus spot size Ф₀ /mm	0.3	0.019	0.006	0.005	0.005	0.001
Diameter of detecting surface Ф /mm	0.5		0.5	0.5		0.075
Reference	［3］	［4］	［5］	［6］	［7］	［8］

Table 2. Design target of receiving optical system for laser ranging

View table

Table 2. Design target of receiving optical system for laser ranging

Parameter	Value
Operating wavelength /nm	905
Focal length /mm	<50.3
Diameter of entrance pupil /mm	50
Field of view /mrad	10
Diameter of APD detecting surface /mm	0.5
Total length /mm	<120
Rear working distance /mm	>0.8

Table 3. Initial performance of laser ranging receiving optical system
View table
Table 3. Initial performance of laser ranging receiving optical system
Root mean square spot radius /µm Enclosed energy radius in 100% /µm
400 900

Table 4. Performance of receiving optical system for laser ranging after optimization
View table
Table 4. Performance of receiving optical system for laser ranging after optimization
Parameter Value
Diameter of entrance pupil D /mm 50
Lagrange invariant J /（mrad·mm） 125
Relative aperture 1∶0.9
Total length L /mm 114.9
Focus spot radius /mm 0.01
Diameter of detecting surface Ф /mm 0.5

Table 5. Parameter settings for tolerance analysis

View table

Table 5. Parameter settings for tolerance analysis

Tolerance type	Value
Refractive index	0.0008
Thickness /mm	±0.05
Surface irregularity per fringe	±0.5
Abbe number /%	0.5
Surface tilt /（°）	±0.2
Element tilt /（°）	±0.2
Element decenter /mm	±0.05
Test wavelength /nm	905

Table 6. Results of Monte Carlo tolerance analysis
View table
Table 6. Results of Monte Carlo tolerance analysis
Sampling probability /% Spot radius /µm
90 11.02894
80 10.38780
50 9.43328
10 8.50426

Table 7. Parameter settings of stray light simulation tracking

View table

Table 7. Parameter settings of stray light simulation tracking

Parameter	Value
Surface parameter	Transmissivity	Absorptivity	A	B	g
Lens surface	0.95	0.002	0.00765	0.0001	1
Structure surface	0	0.8	0.00077	0.001	5
Test wavelength /nm	905
Off-axis angle range /（°）	5‒85
Ray tracing threshold	1×10^-9
Ray tracing number	2×10⁶

Tools

Get Citation

Copy Citation Text

Xingyu Zhou, Liang Sun, Qiao Pan, Shaolong Wu, Guoyang Cao, Xiaofeng Li. Large Relative Aperture Receiving Optical System and Stray Light Suppression for Laser Ranging[J]. Laser & Optoelectronics Progress, 2024, 61(5): 0528001

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites