Jingbo Ma, Peng Li, Ziheng Zhou, Xianwei Han, Zhenkun Wu, Shuxi Dai, Yuzong Gu. Theoretical and Experimental Study on the Measurement of Laguerre-Gaussian Vortex Spot Size Using Knife-Edge Method[J]. Laser & Optoelectronics Progress, 2021, 58(19): 1912004
- Laser & Optoelectronics Progress
- Vol. 58, Issue 19, 1912004 (2021)
Fig. 1. Intensity and phase distributions under different radial index p and topological charge l
Fig. 2. Intensity distributions of LG0lvortex beams along x (y)-direction with different TCs. (a) w00=1 mm; (b) w0l=1 mm
Fig. 3. Schematic diagram of measuring spot radius of LG0l vortex beam by knife-edge method. (a) Blade moves in x-direction; (b) blade moves in y-direction
Fig. 4. Curves of normalized power of LG0l vortex beam versus the shifted position in x(y)-direction
Fig. 5. Experimental setup of measuring spot radius of LG0l vortex beam by knife-edge method
Fig. 6. Spot images of different beams. (a)
Fig. 7. Intensity distribution curve of fundamental Gaussian beam (l=0). (a)(b) Distribution curves in x- and y-directions at z=0, respectively; (c)(d) distribution curves in x- and y-directions at z=100 mm, respectively.
Fig. 8. Intensity distribution curve of LG01 vortex beam (l=1). (a) (b) Distribution curves in x-direction and y-direction at z=0, respectively; (c) (d) distribution curves in x-direction and y-direction at z=100 mm, respectively.
Fig. 9. Intensity distribution curve of LG02 vortex beam (l=2). (a)(b) Distribution curves in x-direction and y-direction at z=0, respectively; (c)(d) distribution curves in x-direction and y-direction at z=100 mm, respectively.
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Table 1. Spot radii in theoretical fitting of different beams
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