Infrared and Laser Engineering, Volume. 54, Issue 6, 20240591(2025)
Design of optical system for laser target imaging echo simulator based on LCOS
Figures & Tables(32)
Fig. 1. Schematic diagram of laser target imaging echo simulator system
Fig. 3. Schematic diagram of area segmentation of fiber array illumination on LCOS
Fig. 7. Sub-channel illumination and collimation optical path diagram
Fig. 8. (a) Pseudo-color illumination diagram; (b) Geometric energy distribution diagram
Fig. 10. (a) Pseudo-color illumination diagram; (b) Column cross-section illumination distribution diagram; (c) Row cross-section illumination distribution diagram
Fig. 11. Principle diagram of multi wavefront superposition imaging in relay system
Fig. 14. Optical system field curvature (a) and distortion (b) evaluation diagram
Fig. 15. (a) Projection light path diagram when the focal length is 397 mm; (b) Projection light path diagram when the focal length is 264 mm
Fig. 16. (a) Optical path diagram of imaging system with focal length of 397 mm; (b) Optical path diagram of imaging system with focal length of 264 mm
Fig. 17. (a) MTF curve at focal length 397 mm; (b) MTF curve at focal length of 264 mm; (c) Standard spot diagram at focal length 397 mm; (d) Standard spot diagram at focal length 264 mm
Fig. 19. Schematic diagram of stray light suppression method for optical system
Fig. 21. (a) Light path diagram before adding stray light diaphragm; (b) Light path diagram after adding stray light diaphragm
Fig. 22. The overall optical path diagram when the focal lengths are 264 mm (a) and 397 mm (b)
Fig. 23. (a) Total energy of the optical system before unsuppression; (b) Total energy of the optical system after suppression; (c) Unsuppressed stray light energy from the front optical system; (d) Suppresses stray light energy from rear optical system
Fig. 24. Energy evaluation chart when the focal length is 397 mm; (b) Energy evaluation chart when the focal length is 264 mm; (c) Schematic diagram of sub-channel energy evaluation; (d) Schematic diagram of energy distribution curve of exit pupil
Table 1. LCOS parameters
View tableView in ArticleTable 1. LCOS parameters
Parameter Value Resolution 1920 ×1200 Pixel size, $\varepsilon $ 8 Refresh rate/Hz 60 Modulation mode Phase type Wavelength, $\lambda $ 1064
Table 2. Requirements for design indicators of illumination system
View tableView in ArticleTable 2. Requirements for design indicators of illumination system
Parameter Value Numerical aperture, $NA$ 0.12 Wavelength, $\lambda $ 1064 Illumination diameter, D/mm 2 Beam divergence, $\theta $ 1.2 Illumination uniformity ≥90% Subchannel pixels, $a \times b $ ≥128×128
Table 3. Requirements for design indicators of relay system
View tableView in ArticleTable 3. Requirements for design indicators of relay system
Parameter Value Collimating lens focal length, ${f_1} $ 15 Wavelength, $\lambda $ 1064 LCOS pixel size/μm 8 Multi-wavefront stack imaging lens set focal length, ${f_2} $ 142 Magnification, $\beta $ 9.5 Telecentricity/(°) ≤0.01 Subchannel pixels, $a \times b $ 128×128 Image height, y/mm 13.86
Table 4. Design specifications requirements for projection system
View tableView in ArticleTable 4. Design specifications requirements for projection system
Parameter Value Wavelength, $\lambda $ 1064 Lens diameter/mm ≥95 Exit pupil diameter, d/mm ≥50 Exit pupil distance, L/mm ≥500 Telecentricity/(°) ≤0.01 Focal length, $ {f_3} $ 264, 397 Field of view, $\theta $ 2, 3
Table 5. Evaluation table for energy uniformity of each sub channel
View tableView in ArticleTable 5. Evaluation table for energy uniformity of each sub channel
Number of sub channel Energy uniformity Focal length=397 mm Focal length=264 mm 1 91.38% 91.34% 2 91.42% 91.4% 3 91.47% 91.47% 4 91.36% 91.32% 5 91.41% 91.34% 6 91.44% 91.38%
Table 6. Lighting system tolerance allocation
View tableView in ArticleTable 6. Lighting system tolerance allocation
Type Tolerances Parameter Value Element tolerances Tilt X/(°) 0.008 Tilt Y/(°) 0.008 Tilt Z/(°) 0.008 Decenter X/mm 0.005 Decenter Y/mm 0.005 Decenter Z/mm 0.005 Lens tolerances Material index 0.001 Material abbe 0.1% Thickness/mm 0.01
Table 7. Imaging optical system tolerance assignment data
View tableView in ArticleTable 7. Imaging optical system tolerance assignment data
Type Tolerances Parameter Value Surface tolerances Radius/fringes 2 Thickness/mm 0.04 Decenter X/mm 0.01 Decenter Y/mm 0.01 Tilt X/(°) 0.017 Tilt Y/(°) 0.017 Material S+A irregularity/fringes 0.5 Index 0.001 Abbe 0.1% Element tolerances Decenter X/mm 0.01 Decenter Y/mm 0.01 Tilt X/(°) 0.017 Tilt Y/(°) 0.017
Table 8. Probability after Monte Carlo calculation
View tableView in ArticleTable 8. Probability after Monte Carlo calculation
Monte Carlo analysis Value of MTF >90% 0.416 >80% 0.433 >50% 0.454 >20% 0.471 >10% 0.484
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Hanyang XIE, Yan AN, Wenbin XU, Jiaxuan LIU, Xinhang LI, Lei ZHANG, Yansong SONG, Keyan DONG. Design of optical system for laser target imaging echo simulator based on LCOS[J]. Infrared and Laser Engineering, 2025, 54(6): 20240591
Paper Information
Category: Optical design and fabrication
Received: Dec. 19, 2024
Accepted: --
Published Online: Jul. 1, 2025
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