Acta Photonica Sinica, Volume. 52, Issue 11, 1111002(2023)
Synthetic Aperture Imaging Lidar Tran-receiver Optical System Based on Microlens Array
Figures & Tables(13)
Fig. 4. Effects of the single mode fiber coupling efficiency for different cases
Fig. 6. Measurement results of the coupling efficiency for the 4×4 fiber micro-lens array
Fig. 8. Spot of the focus surface for the transmitter and receiver
Table 1. Parameters of the fiber micro-lens array
View tableView in ArticleTable 1. Parameters of the fiber micro-lens array
No. Index name Parameters 1 Array size 4×4 2 Wavelength 1 520~1 620 nm 3 Material K-PG375 4 Transmittance ratio ≥99.5%（1 550 nm±5 nm） 5 Micro-lens array size 7 mm×7 mm 6 Focal length 4.8 mm 7 Center thickness 1 mm 8 Curvature 2.53 mm 9 Conic coefficient -0.57 10 Effective aperture 1.2 mm 11 Center space 1.24 mm×1.24 mm 12 Alignment accuracy ±0.001 mm 13 Surface flatness λ/30（@632.8 nm） 14 Fiber type PMF 15 Mode field diameter 10.5 μm 16 Number aperture 0.125 17 Coupled efficiency ≥70% 18 Uniformity ±3° 19 Distribution accuracy ±0.001 mm 20 Beam quality Gaussian mode
Table 2. Coupling efficiency of the different field of view
View tableView in ArticleTable 2. Coupling efficiency of the different field of view
No. Half field of view/（°） Efficiency 1 0 0.813 291 499 2 0.000 143 239 0.812 361 066 3 0.000 286 479 0.809 572 275 4 0.000 429 718 0.804 893 894 5 0.000 572 958 0.798 404 888 6 0.000 716 197 0.790 100 782 7 0.000 859 437 0.780 012 488 8 0.001 002 676 0.768 093 323 9 0.001 145 916 0.754 564 001 10 0.001 289 155 0.739 416 596 11 0.001 432 394 0.722 734 353 12 0.001 575 634 0.704 483 210 13 0.001 718 873 0.685 027 978 14 0.001 862 113 0.664 368 936 15 0.002 005 352 0.642 637 232 16 0.002 148 592 0.619 808 799 17 0.002 291 831 0.596 342 261 18 0.002 435 071 0.572 223 412 19 0.002 578 310 0.547 591 409 20 0.002 721 550 0.522 405 366 21 0.002 864 789 0.497 145 235
Table 3. Calculation results of the coupling efficiency for the whole field of view
View tableView in ArticleTable 3. Calculation results of the coupling efficiency for the whole field of view
No. Field of view/μrad Area Weight ratio Weight ratio×efficiency 1 0 1.963 5×10-11 0.002 5 0.002 033 229 2 2.5×10-6 5.890 49×10-11 0.007 5 0.006 092 708 3 5×10-6 9.817 48×10-11 0.012 5 0.010 119 653 4 7.5×10-6 1.374 45×10-10 0.017 5 0.014 085 643 5 1×10-5 1.767 15×10-10 0.022 5 0.017 964 11 6 1.25×10-5 2.159 84×10-10 0.027 5 0.021 727 771 7 1.5×10-5 2.552 54×10-10 0.032 5 0.025 350 406 8 1.75×10-5 2.945 24×10-10 0.037 5 0.028 803 5 9 2×10-5 3.337 94×10-10 0.042 5 0.032 068 97 10 2.25×10-5 3.730 64×10-10 0.047 5 0.0351 222 88 11 2.5×10-5 4.123 34×10-10 0.052 5 0.037 943 554 12 2.75×10-5 4.516 04×10-10 0.057 5 0.040 507 785 13 3×10-5 4.908 74×10-10 0.062 5 0.042 814 249 14 3.25×10-5 5.301 44×10-10 0.067 5 0.044 844 903 15 3.5×10-5 5.694 14×10-10 0.072 5 0.046 591 199 16 3.75×10-5 6.086 84×10-10 0.077 5 0.048 035 182 17 4×10-5 6.479 53×10-10 0.082 5 0.049 198 237 18 4.25×10-5 6.872 23×10-10 0.087 5 0.050 069 549 19 4.5×10-5 7.264 93×10-10 0.092 5 0.050 652 205 20 4.75×10-5 7.657 63×10-10 0.097 5 0.050 934 523
Table 4. Test results of the coupling efficiency for the 4×4 fiber micro-lens array
View tableView in ArticleTable 4. Test results of the coupling efficiency for the 4×4 fiber micro-lens array
No. Output/mW Input/mW Transmittance ratio No. Output/mW Input/mW Transmittance ratio 1 1.128 1.56 72% 9 1.123 1.56 72% 2 1.124 72% 10 1.14 73% 3 1.145 73% 11 1.14 73% 4 1.14 73% 12 1.141 73% 5 1.126 72% 13 1.147 74% 6 1.148 74% 14 1.147 74% 7 1.157 74% 15 1.149 74% 8 1.143 73% 16 1.163 75% Average transmittance 73.1%
Table 5. Axis misalignment between the transmitter and receiver
View tableView in ArticleTable 5. Axis misalignment between the transmitter and receiver
Item X/mm Y/mm Misaligment/（″） Transmitter 6 6 0 Receiver channel 1 6.096 6.239 4.4 Receiver channel 2 6.148 6.076 2.9 Receiver channel 3 6.143 5.982 2.5 Receiver channel 4 6.302 5.832 5.9 Receiver channel 5 6.301 6.171 6.0 Receiver channel 6 6.348 5.922 6.1 Receiver channel 7 6.454 5.916 7.9 Receiver channel 8 6.547 5.841 9.8 Receiver channel 9 5.893 6.162 3.3 Receiver channel 10 6.189 5.91 3.6 Receiver channel 11 6.307 5.916 5.5 Receiver channel 12 6.374 5.78 7.5 Receiver channel 13 5.919 6.068 1.8 Receiver channel 14 6.001 5.846 2.6 Receiver channel 15 6.1 5.765 4.4 Receiver channel 16 5.949 5.687 5.5
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Long GAO, Xianjie LI, Chao AN, Zongyao OU, Peisi WANG, Ziqi SONG, Yuliang TAO, Jin WU. Synthetic Aperture Imaging Lidar Tran-receiver Optical System Based on Microlens Array[J]. Acta Photonica Sinica, 2023, 52(11): 1111002
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Received: Mar. 6, 2023
Accepted: May. 22, 2023
Published Online: Dec. 22, 2023
The Author Email: GAO Long (gaolongc508@163.com)
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