Infrared and Laser Engineering, Volume. 53, Issue 8, 20240187(2024)
Study of optical antenna image quality under high-power laser irradiation
Figures & Tables(16)
Fig. 1. Structure diagram of an off-axis two-mirror optical antenna
Fig. 3. Coordinate system setup for analytical modeling of off-axis two-mirror optical antenna
Fig. 4. Temperature field distribution of primary and secondary mirrors
Fig. 5. Primary and secondary mirrors and displacement clouds of the system
Fig. 6. The displacement value of the primary and secondary mirror. (a) The displacement value of the primary mirror; (b) The displacement value of the secondary mirror
Fig. 7. Comparison plot of the Zernike polynomial coefficient values before and after removing the displacement of the primary and secondary mirrors
Fig. 8. The curves of Zernike coefficient values and wavefront. (a) Zernike factor of the primary mirror；(b) Zernike factor of the secondary mirror； (c) Zernike factor of the antenna；(d) The wavefront RMS and PV of antenna
Fig. 9. Wavefront aberration diagram of an off-axis dual-reflector optical antenna under the action of a 10 W laser for 30 minutes
Fig. 10. Field diagram of equivalence experiment. (a) Measurement of antenna wavefront aberration at room temperature of 19 ℃; (b) Measurement of antenna wavefront aberration after loading a 10 W laser
Fig. 12. Comparison of wavefront aberrations in the antenna before and after loading with a 10 W laser. (a) Wavefront aberration of the antenna measured before laser loading； (b) Wavefront aberration of the measured antenna after loading a 10 W laser for 30 minutes
Table 1. Physical parameters of some materials
View tableView in ArticleTable 1. Physical parameters of some materials
Parameters Titanium alloy Aluminum alloy H-K9L Zerodur Fused silica Density/g·mm3 4.40 2.77 2.52 3.21 2.19 Young's modulus/GPa 114.00 68.10 79.20 91.00 73.00 Linear expansion coefficient/℃ 8.80×10−6 23.60×10−6 7.60×10−6 0.05×10−6 0.50×10−6 Thermal conductivity/W·m−1·℃−1 7.30 121.00 1.50 1.64 1.40 Poisson's ratio 0.31 0.33 0.21 0.24 0.17 Specific heat capacity/J·kg−1·℃−1 522.30 960.00 649.00 821.00 750.00 Extinction coefficient(λ= 1055 nm)- - 1.34E-08 3.36E-09 6.72E-09
Table 2. The
Z -axis (optical axis) displacement value of the lens surface under a transient thermal load of 1 000 WView tableView in ArticleTable 2. The
Z -axis (optical axis) displacement value of the lens surface under a transient thermal load of 1 000 WTime/s 0 50 100 150 200 250 300 Primary mirror/mm −8.40E-5 −1.26E-4 −3.92E-4 −6.2E-4 −8.4E-4 −1.78E-3 −3.06E-3 Secondary mirror/mm −8.40E-5 −6.33E-4 −9.52E-4 −1.43E-3 −3.91E-3 −6.78E-3 −8.20E-3 Antenna/mm 1.68E-4 7.59E-4 1.34E-3 2.02E-3 4.75E-3 8.56E-3 1.13E-2
Table 3. Correlations between Fringe Zernike polynomials and Sediel aberrations
View tableView in ArticleTable 3. Correlations between Fringe Zernike polynomials and Sediel aberrations
Zernike coefficient ai Polynomial zi Physical meaning a1 1 Translate a2 $\rho \cos \theta $ Tilt x a3 $\rho \sin \theta $ Tilt y a4 $2{\rho ^2} - 1$ Defoucus a5 ${\rho ^2}\cos 2\theta $ 0° or 90° astigmatism a6 ${\rho ^2}\sin 2\theta $ ±45° astigmatism a7 $\left( {3{\rho ^2} - 2} \right)\rho \cos \theta $ Coma x a8 $\left( {3{\rho ^2} - 2} \right)\rho \sin \theta $ Coma y a9 $6{\rho ^4} - 6{\rho ^2} + 1$ Primary spherical
Table 4. The changes in wavefront aberrations of the experimental antenna over time
View tableView in ArticleTable 4. The changes in wavefront aberrations of the experimental antenna over time
Time/min Measurement RMS (λ=632.8 nm) Simulation RMS (λ=632.8 nm) Error 3 0.051λ 0.047λ 5.88% 6 0.051λ 0.047λ 7.84% 9 0.052λ 0.049λ 5.76% 12 0.053λ 0.051λ 3.77% 15 0.054λ 0.053λ 1.85% 18 0.056λ 0.054λ 3.57% 21 0.057λ 0.055λ 3.50% 24 0.058λ 0.056λ 3.44% 27 0.060λ 0.057λ 5.00% 30 0.063λ 0.058λ 7.93%
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Xiang LI, Dongyu WU, Ziting SUN, Liang GAO, Yan AN, Yansong SONG, Keyan DONG. Study of optical antenna image quality under high-power laser irradiation[J]. Infrared and Laser Engineering, 2024, 53(8): 20240187
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Received: Apr. 28, 2024
Accepted: --
Published Online: Oct. 29, 2024
The Author Email: WU Dongyu (wudongyu1111@163.com)
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