Chenhui Hu, Lei Chen, Chen Huang, Zhiyao Ma, Yue Qian, Zhe Zhang, Ruokun Li, Donghui Zheng. Extended Light Source of Multimode Fibers for Suppressing Coherent Noise in Phase-Shift Interferometer[J]. Acta Optica Sinica, 2022, 42(19): 1906001
- Acta Optica Sinica
- Vol. 42, Issue 19, 1906001 (2022)
Fig. 1. Interference system model of multimode fiber extended light source
Fig. 2. Mode interference in MMF. (a) Ray propagation in MMF; (b) mode interference pattern at fiber end
Fig. 3. Interferogram contrast varying with spot size under different cavity lengths
Fig. 4. Effect of rotating ground glass speed on speckle contrast under different pupil apertures
Fig. 5. Effect of core diameter of multimode fiber on speckle contrast under different CCD exposure time
Fig. 6. Effect of core diameter of multimode fiber on speckle contrast under different NAs
Fig. 7. Speckle patterns of output light from multimode fibers with different core diameters collected in experiment (without ground glass). (a) 62.50 μm; (b) 0.25 mm; (c) 0.50 mm; (d) 0.75 mm; (e) 1.00 mm; (f) 1.50 mm; (g) 2.00 mm; (h) 3.00 mm
Fig. 8. Experimental interferograms of multimode fibers with different core diameters. (a) 62.50 μm; (b) 0.25 mm; (c) 0.50 mm; (d) 0.75 mm; (e) 1.00 mm; (f) 1.50 mm; (g) 2.00 mm; (h) 3.00 mm
Fig. 9. Experimental results. (a) Phase result measured by single-mode fiber light source with large numerical aperture; (b) phase result measured by multimode fiber extended source; (c) relative residual
Fig. 10. Relationship between actual speckle contrast and core diameter of multimode fiber
Fig. 11. Actual minimum boundary curve of core diameter of multimode fiber
Fig. 12. Relationship between actual fringe contrast and core diameter of fiber
Fig. 13. Background image speckle contrast curve of plastic multimode fiber extended light source interferometer with different core diameters collected by experiment
Fig. 14. Interferogram SNRs of light sources with different core diameters
Fig. 15. Normalized uniform distribution of interferometer background
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Table 1. Speckle contrast of output light from multimode fibers with different core diameters collected in experiment
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Table 2. Interferogram contrast under different multimode fiber light source systems
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