chen youjie, duan kailiang, zhao wei, et al. Paraxial propagation properties of waveguide modes in single-mode fiber[J]. High Power Laser and Particle Beams, 2010, 22.
Citation:
chen youjie, duan kailiang, zhao wei, et al. Paraxial propagation properties of waveguide modes in single-mode fiber[J]. High Power Laser and Particle Beams, 2010, 22.
chen youjie, duan kailiang, zhao wei, et al. Paraxial propagation properties of waveguide modes in single-mode fiber[J]. High Power Laser and Particle Beams, 2010, 22.
Citation:
chen youjie, duan kailiang, zhao wei, et al. Paraxial propagation properties of waveguide modes in single-mode fiber[J]. High Power Laser and Particle Beams, 2010, 22.
Institute of Laser Physics and Chemistry,Sichuan University,Chengdu 610064,China;
2.
State Key Laboratory of Transient Optics and Photonics,Xi’an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi’an 030001,China
By expanding the LP01 mode into a linear superposition of Laguerre-Gaussian modes and using Collins formula, the analytical propagation equation of wave-guide modes in a single-mode fiber through paraxial ABCD optical systems is derived. The free-space propagation and focusing properties of the LP01 mode are studied and compared with those of the fundamental Gaussian mode. It is shown that the Gaussian mode in place of the LP01 mode may introduce some errors. In the focused field of the LP01 mode there exists the focal shift which increases with decreasing Fresnel number. By a suitable choice of the Fresnel number, a long focusing depth may appear for the LP01 mode which is quite different from that of the focused Gaussian mode.
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