Acta Photonica Sinica, Volume. 52, Issue 12, 1212002(2023)
Optical Design of a Self-calibrated Low Light Radiance Meter Based on Correlated Photons
Figures & Tables(27)
Fig. 2. Schematic diagram of noncollinear angles of correlated photons pumped by BBO crystals under different phase matching angles
Fig. 4. Schematic diagram of absolute quantum efficiency calibration of single photon detectors based on SPDC
Fig. 8. Structure of the first and second channel coupled lens set
Fig. 9. Full field of view spot diagram of image surface light spot in first channel
Fig. 10. Full field of view spot diagram of image surface light spot in channel 2
Fig. 14. Full field of view spot diagram of image surface light spot in channel 3
Table 1. Functions of some components of radiance meter
View tableView in ArticleTable 1. Functions of some components of radiance meter
Element Main function Glantler prism Adjust the pump laser polarization state to linear polarization Half-wave plate Enables/disables parametric downconversion Off-axis parabolic mirror Reduce the influence of color difference and uncertainty and improve the equivalence Filter module Filter pump light and improve the signal-to-noise ratio of correlated photon measurement
Table 2. Estimation of observed radiance range of low light radiance meter
View tableView in ArticleTable 2. Estimation of observed radiance range of low light radiance meter
Parameter Technical index Wavelength range 460 ~1 550 nm Observation bandwidth <12 nm Observed field of view ±1° Field aperture 100 μm Transmittance of optical system 0.15 Si APD Dark count rate <500/s Saturation count rate 20 M/s Quantum efficiency 69%@685 nm InGaAs APD Dark count rate <1 000/s Saturation count rate 1 M/s Quantum efficiency 10%@1 550 nm Target radiance 1×10-9~1×10-6 W/（cm2·sr·nm）
Table 3. Main performance parameters of low light radiance meter
View tableView in ArticleTable 3. Main performance parameters of low light radiance meter
Main parameter Index requirement Operating wavelength range 460~1 550 nm Pump laser wavelength 355 nm Crystal type BBO Coincidence band 460 nm/1550 nm，580 nm/910 nm，
610 nm/850 nm，685 nm/737 nm
Working mode Self-calibration model and radiation observation model Observation field of view ±1° Spectral radiance measurement range 1×10-9~1×10-6 W/（cm2·sr·nm） Measurement uncertainty 8%（k=2）
Table 4. H-ZF52A glass transmission
View tableView in ArticleTable 4. H-ZF52A glass transmission
Wavelength/nm Transmission Thickness/mm 460 0.953 10 480 0.966 10 550 0.989 10 600 0.993 10 700 0.996 10 850 0.998 10 900 0.998 10 1000 0.998 10 1400 0.998 10 1600 0.998 10
Table 5. H-ZF88 glass transmission
View tableView in ArticleTable 5. H-ZF88 glass transmission
Wavelength/nm Transmission Thickness/mm 460 0.886 10 480 0.921 10 550 0.979 10 600 0.989 10 700 0.993 10 850 0.995 10 900 0.996 10 1000 0.998 10 1400 0.998 10 1600 0.996 10
Table 6. First channel focusing optical path parameter
View tableView in ArticleTable 6. First channel focusing optical path parameter
Surface number Surface type Radius of curvature/mm Surface thickness/mm Material Half-height of aperture/mm 1 Sphere INFINITY 4.3 H-ZPK1A 12 2 Sphere -31.947 4 AIR 12 3 Sphere 18.000 11 H-ZPK1A 11 4 Sphere 18.000 3 H-ZF52A 11 5 Sphere 49.304 11.175 AIR 6
Table 7. Second channel focusing optical path parameter
View tableView in ArticleTable 7. Second channel focusing optical path parameter
Surface number Surface type Radius of curvature/mm Surface thickness/mm Material Half-height of aperture/mm 1 Sphere INFINITY 4.3 H-LAF52 12 2 Sphere -31.344 4 AIR 12 3 Sphere 18.000 11 H-ZPK1A 11 4 Sphere 18.000 3 H-ZF52A 11 5 Sphere 20.927 17.175 AIR 6
Table 8. Tolerance setting parameters table
View tableView in ArticleTable 8. Tolerance setting parameters table
Tolerance parameter Set value Radius of curvature
Surface thickness
2 aperture
0.02 mm
S+A irregularity 0.2 aperture Surface/component eccentricity 0.02 mm Surface/element tilt 0.02° Refractive index 0.001% Abbe 0.05%
Table 9. Tolerance analysis results of first channel
View tableView in ArticleTable 9. Tolerance analysis results of first channel
Percentage RMS radius/μm 98%> 7.20 90%> 6.27 80%> 5.79 50%> 5.07 20%> 4.57 10%> 4.41 2%> 4.14
Table 10. Tolerance analysis results of channel 2
View tableView in ArticleTable 10. Tolerance analysis results of channel 2
Percentage RMS radius /μm 98%> 8.91 90%> 7.08 80%> 6.17 50%> 4.79 20%> 3.70 10%> 3.37 2%> 2.92
Table 11. Third channel focusing optical path parameter table
View tableView in ArticleTable 11. Third channel focusing optical path parameter table
Surface number Surface type Radius of curvature/mm Surface thickness/mm Material Half-height of aperture/mm 1
2
Sphere
Sphere
179.703
-24.030
11
4.5
H-ZPK1A
H-ZF52A
16
16
3 Sphere INFINITY 1 AIR 18 4 Sphere 35.021 10 H-ZPK1A 16 5 Sphere -35.820 4.5 H-ZF52A 16 6 Sphere -81.006 55.889 AIR 18
Table 12. Tolerance analysis results of channel 3
View tableView in ArticleTable 12. Tolerance analysis results of channel 3
Percentage RMS radius/μm 98%> 3.44 90%> 2.60 80%> 2.20 50%> 1.64 20%> 1.35 10%> 1.25 2%> 1.15
Table 13. Extreme spot diameters in the image plane of three channels
View tableView in ArticleTable 13. Extreme spot diameters in the image plane of three channels
Channel Observation band/nm Optimal value of light spot in image plane/μm Worst value of light spot in image surface/μm Design index/μm 1 460~685 59.94 97.34 300 2
3
737~910
1 550
51.44
42.64
90.64
52.12
300
62.5
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Jiaqing SHI, Bing YU, Junwei CHU, Jihong FAN, Youbo HU, Jianjun LI. Optical Design of a Self-calibrated Low Light Radiance Meter Based on Correlated Photons[J]. Acta Photonica Sinica, 2023, 52(12): 1212002
Paper Information
Category: Instrumentation, Measurement and Metrology
Received: Apr. 23, 2023
Accepted: Jun. 9, 2023
Published Online: Feb. 19, 2024
The Author Email: LI Jianjun (jjli@aiofm.ac.cn)
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