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Proceedings Paper

Polarizing 50µm core Yb-doped photonic bandgap fiber
Author(s): Fanting Kong; Guancheng Gu; Thomas W. Hawkins; Joshua Parsons; Maxwell Jones; Christopher Dunn; Monica T. Kalichevsky-Dong; Benjamin Pulford; Iyad Dajani; Kunimasa Saitoh; Stephen P. Palese; Eric Cheung; Liang Dong
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Paper Abstract

Polarizing optical fibers are important components for building compact fiber lasers with linearly polarized laser output. Conventional single-mode optical fibers with birefringence can only preserve the polarization when the incident beam is launched properly. Recent reports demonstrate that the birefringence in photonic bandgap fibers (PBFs) can provide single-polarization operation near the edge of transmission band by shifting the transmission band for the light with orthogonal polarizations. Here, we demonstrate a 50μm core Yb-doped polarizing photonic bandgap fiber (PBF) for single-polarization operation throughout the entire transmission band from 1010nm to 1170nm with a polarization extinction ratio (PER) of >5dB/m, which is >15dB/m near the short wavelength edge of the transmission band. The polarizing effect is due to the differential polarization transmission loss presented in this fiber, which is benefited from the fiber birefringence of 3.2x10-4, obtained by incorporating low-index boron-doped rods on either side of the core. The achievement is based on the fact that light at fast axis has lower effective mode index which is closer to the modes in the photonic cladding and thus to be easily coupled into cladding. A 2.6m long straight fiber was tested in a laser configuration without any polarizers to achieve single polarized laser output with a PER value of 21dB at 1026nm lasing wavelength.

Paper Details

Date Published: 4 March 2015
PDF: 6 pages
Proc. SPIE 9344, Fiber Lasers XII: Technology, Systems, and Applications, 934403 (4 March 2015); doi: 10.1117/12.2076605
Show Author Affiliations
Fanting Kong, Clemson Univ. (United States)
Guancheng Gu, Clemson Univ. (United States)
Thomas W. Hawkins, Clemson Univ. (United States)
Joshua Parsons, Clemson Univ. (United States)
Maxwell Jones, Clemson Univ. (United States)
Christopher Dunn, Clemson Univ. (United States)
Monica T. Kalichevsky-Dong, Clemson Univ. (United States)
Benjamin Pulford, Kirtland Air Force Base (United States)
Iyad Dajani, Kirtland Air Force Base (United States)
Kunimasa Saitoh, Hokkaido Univ. (Japan)
Stephen P. Palese, Northrop Grumman Aerospace Systems (United States)
Eric Cheung, Northrop Grumman Aerospace Systems (United States)
Liang Dong, Clemson Univ. (United States)

Published in SPIE Proceedings Vol. 9344:
Fiber Lasers XII: Technology, Systems, and Applications
L. Brandon Shaw, Editor(s)

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