Infrared and Laser Engineering, Volume. 54, Issue 3, 20240506(2025)
Design of emission optical system with common optical path for projection and scanning based on liquid lens
Figures & Tables(19)
Fig. 1. Working principle diagram of the emission optical system with common optical path for projection and scanning
Fig. 5. Structural diagram of the co-optical path transmitting optical system
Fig. 10. Irradiance diagram of light spot cross-section of 520 nm laser at different distances under physical optics propagation
Fig. 11. Irradiance diagram of light spot cross-section of 638 nm laser at different distances under physical optics propagation
Table 1. Structural parameters of liquid lens at optical power of –6 dpt, 0 dpt, 10 dpt
View tableView in ArticleTable 1. Structural parameters of liquid lens at optical power of –6 dpt, 0 dpt, 10 dpt
Surface Radius/mm Thickness/mm Material 1 (Cover glass) Infinity 0.5 H-K9L 2 (Air) Infinity 2.563 (−6 dpt), 2.41 (0 dpt), 2.155 (10 dpt) - 3 (Membrane) −75.443 (−6 dpt), Infinity (0 dpt), 45.262 (10 dpt) 0.1 1.41, 49.9 4 (Liquid) −75.443 (−6 dpt), Infinity (0 dpt), 45.262 (10 dpt) 0.547 (−6 dpt), 0.7 (0 dpt), 0.955 (10 dpt) 1.45, 55.5 5 (Container mem) Infinity 0 1.41, 49.9 6 (Container glass) Infinity 1 H-K9L 7 (Air) Infinity 1 -
Table 2. Optical system design parameters
View tableView in ArticleTable 2. Optical system design parameters
Parameter Specification Input beam diameter/mm 3 Work wavelength/nm 515-525，633-643 Beam expansion ratio in scanning state 3-4.5 Divergence angle in scanning state/mrad ≤0.75 Focusing range in projection state/m 5-30 Focus spot size in projection state/mm ≤1 mm@10 m， ≤2 mm@20 m， ≤3 mm@30 m Optical length/mm ≤135
Table 3. The first set of structural parameters
View tableView in ArticleTable 3. The first set of structural parameters
Surface Radius/mm Thickness/mm Material 1 −20.552 2.608 H-FK95N 2 37.535 37.043 3 163.000 4.681 D-ZLAF81 4 79.697 1.219 5 127.265 4.220 H-FK95N 6 −29.150 - -
Table 4. The second set of structural parameters
View tableView in ArticleTable 4. The second set of structural parameters
Surface Radius/mm Thickness/mm Material 1 Infinity 3.515 H-F4 2 49.325 32.729 3 −817.451 2.597 D-ZK2L-25 4 1818.272 1.401 5 −215.758 4.975 H-ZK3 6 −49.206 - -
Table 5. The corresponding focal lengths
Table 5. The corresponding focal lengths
Beam expansion ratio ${f_{\text{f}}}$ ${f_{\text{s}}}$ 3× 169.384 −803.664 3.75× Infinity − 14120.000 4.5× −168.397 1355.130
Table 6. Input tolerance
View tableView in ArticleTable 6. Input tolerance
Items Tolerance Surface tolerances Radius/fringes 3 Thickness/mm 0.05 Decent/mm 0.02 Tilt/(°) 0.033 S+A irregular/fringes 0.5 Element tolerances Decent/mm 0.02 Tilt/(°) 0.033 Index 0.001 Abbe 1%
Table 7. Tolerance analysis results of optical system in scanning state
View tableView in ArticleTable 7. Tolerance analysis results of optical system in scanning state
Yield rate RMS angular radius/mrad 3× 3.75× 4.5× 90% <0.162 <0.151 <0.149 80% <0.123 <0.124 <0.119 50% <0.079 <0.065 <0.071 20% <0.037 <0.024 <0.032 10% <0.022 <0.016 <0.021
Table 8. Tolerance analysis results of optical system in projection state
View tableView in ArticleTable 8. Tolerance analysis results of optical system in projection state
Yield rate RMS spot radius/mm 5 m 10 m 20 m 30 m 90% <0.090 <0.202 <0.425 <0.636 80% <0.079 <0.166 <0.366 <0.552 50% <0.057 <0.131 <0.287 <0.431 20% <0.042 <0.101 <0.230 <0.346 10% <0.036 <0.089 <0.211 <0.303
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Yulei XING, Jinsong WANG, Yunchuan ZHANG, Xin XU. Design of emission optical system with common optical path for projection and scanning based on liquid lens[J]. Infrared and Laser Engineering, 2025, 54(3): 20240506
Paper Information
Category: Optical design and fabrication
Received: Nov. 5, 2024
Accepted: --
Published Online: Apr. 8, 2025
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