Acta Photonica Sinica, Volume. 52, Issue 11, 1122001(2023)
Stable Structure of a Near-infrared Doppler Asymmetric Spatial Heterodyne Interferometer
Figures & Tables(17)
Fig. 6. Schematic illustration of the bonding surface bowing effect
Fig. 7. Surface shape cloud picture of the DASH interferometer assembly in near-infrared
Fig. 8. Vibration tesing of the DASH interferometer assembly in near-infrared
Table 1. DASH interferometer design parameters
View tableView in ArticleTable 1. DASH interferometer design parameters
Element Material Design parameters Value Beam Splitter（BS1&BS2） Fused silica Size 60 mm×60 mm×50 mm Wedged Spacers（S1） Fused silica Thickness @center 4.73 mm Wedged Spacers（S2） CaF2 Thickness @center 15.66 mm Prism（P1） N-SF57 Thickness @center 10.14 mm Prism（P2） N-SF57 Thickness @center 29.72 mm Parallel Spacers（PPS） Fused silica Thickness @center 6 mm Grating（G1&G2） Fused silica Size 60 mm×60 mm×8 mm
Table 2. Natural frequencies in three directions.
View tableView in ArticleTable 2. Natural frequencies in three directions.
Parameter Value fx 666.65 Hz fy 681.61 Hz fz 1 007.72 Hz
Table 3. Material properties
View tableView in ArticleTable 3. Material properties
Material Density/（kg·m-3） Yong's modulus/GPa Possion ratio Coefficient of thermal expansion/℃-1 Thermal conductivity/（W·m-1·℃-1） TC4 4 400 109 0.28 9.1×10-6 7.4 Invar 8 100 145 0.25 0.6×10-6 13.9 Fused silica 2 200 73.1 0.2 0.5×10-6 1.31 CaF2 3 180 75.8 0.28 1.876×10-5 9.71 N-SF57 3 500 96 0.26 8.48×10-6 0.99
Table 4. Natural frequencies of FEM in three directions
View tableView in ArticleTable 4. Natural frequencies of FEM in three directions
Direction Natural frequency/Hz X 634 Y 686 Z 942
Table 5. Random vibration test conditions
View tableView in ArticleTable 5. Random vibration test conditions
Frequency range/Hz Acceleration power spectral density /（g2·Hz-1） Direction 20~190 0.003 35 X， Y，Z 190~500 0.015 500~750 0.011 25 750~2 000 0.000 5
Table 6. Stress of FEM
View tableView in ArticleTable 6. Stress of FEM
Direction Maximum shear stress between the structure and optical elements /MPa Maximum shear stress between optical elements /MPa Maximum mechanical stress of structure/MPa Maximum mechanical stress of optical elements/MPa X 2.8 0.16 31.26 0.4 Y 2.6 0.15 31.04 0.38 Z 3.4 0.2 35.56 0.56
Table 7. PV and RMS
View tableView in ArticleTable 7. PV and RMS
Optical component RMS PV Long arm 1.55 nm 6.467 nm Short arm 1.671 nm 7.850 nm
Table 8. Comparison of natural frequencies of modal analysis and test
View tableView in ArticleTable 8. Comparison of natural frequencies of modal analysis and test
Direction Natural frequency/Hz Error FEM Test X 634 649.7 2.4% Y 686 669.8 2.4% Z 942 979.2 3.8%
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Jian SUN, Yutao FENG, Chenguang CHANG, Wei WANG, Juan LI, Bingliang HU. Stable Structure of a Near-infrared Doppler Asymmetric Spatial Heterodyne Interferometer[J]. Acta Photonica Sinica, 2023, 52(11): 1122001
Paper Information
Category: Optical Design and Fabrication
Received: May. 18, 2023
Accepted: Jun. 18, 2023
Published Online: Dec. 22, 2023
The Author Email: Yutao FENG (fytciom@opt.ac.cn)
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