Wenkang Zou, Chunyong Yang, Jin Hou, Hao Long, Shaoping Chen. Measurement of Topological Charges for Vortex Beams using Gradually-Changing-Period Annular Gratings[J]. Laser & Optoelectronics Progress, 2019, 56(14): 140501
- Laser & Optoelectronics Progress
- Vol. 56, Issue 14, 140501 (2019)
Fig. 1. Principle diagram of mode measuring for vortex beam. (a) Gaussian beam; (b) vortex beam; (c) diffraction pattern
Fig. 2. Structural patterns of gradually-changing-period gratings. (a) Grating with gradually-changing-period amplitude; (b) grating with gradually-changing-period phase; (c) vortex beams
Fig. 3. Simulation patterns of mode measuring for vortex beams. (a) Diffraction results of vortex beam measurement with amplitude grating when l=±1, ±2, ±3, ±4; (b) partially magnified diffraction pattern
Fig. 4. Diffraction results of vortex beam measurement with phase grating when l=±10, ±20, ±30
Fig. 5. Experimental link diagram of generation and mode measurement of vortex beam
Fig. 6. Simulation and experimental results of vortex beam generation when l=+1, -2, -3, +8
Fig. 7. Simulation and experimental results of mode measurement for vortex beams using phase grating when l=+1, -2, -3, +8
Fig. 8. Diffraction experimental results of mode measurement for vortex beam using phase grating when l=+16,+20,+30
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