New method for side pumping of double-clad fiber lasers using planar grating written into the inner cladding

Xingchun Chu; Shanghong Zhao; Zhouliang Wu; Lei Shi; Shengbao Zhan; Yunxia Li; Lihua Ma

doi:10.1117/12.834164

28 August 2009 New method for side pumping of double-clad fiber lasers using planar grating written into the inner cladding

Xingchun Chu, Shanghong Zhao, Zhouliang Wu, Lei Shi, Shengbao Zhan, Yunxia Li, Lihua Ma

Author Affiliations +

Proceedings Volume 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging; 73820X (2009) https://doi.org/10.1117/12.834164
Event: International Symposium on Photoelectronic Detection and Imaging 2009, 2009, Beijing, China

Abstract

A new side pumping method based on the diffractive properties of a planar grating which is directly written into the inner cladding of a double-clad fiber (DCF) is proposed. This technique assumes that the inner cladding of the DCF is highly photosensitive and its diameter is large enough. Then a planar grating with a proper thickness can be written into the inner cladding. The principles, characteristics and coupling efficiencies of the proposed scheme are described and simulated by coupled wave theory. The simulating results show that the coupling efficiencies can achieve over 98% for TE-, TM- and un-polarized incident pump lights simultaneously. And the average coupling efficiencies can still achieve 80% regardless of TE or TM polarization even when the pump wavelength ranges from 974 to 978nm and the incident angle ranges from −0.8° to 0.8°. The fabrication tolerances of the planar grating and the leakage of pump powers for multi-point side-pumping are also analyzed. The advantages of the proposed scheme include: (1) no risk of damaging the DCF; (2) no index-matching optical adhesive; (3) high temperature sustainability; (4) simple, stable and compact. It provides an effective way to scale the output power of DCF lasers or amplifiers to a high level.

Citation Download Citation

Xingchun Chu, Shanghong Zhao, Zhouliang Wu, Lei Shi, Shengbao Zhan, Yunxia Li, and Lihua Ma "New method for side pumping of double-clad fiber lasers using planar grating written into the inner cladding", Proc. SPIE 7382, International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging, 73820X (28 August 2009); https://doi.org/10.1117/12.834164

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KEYWORDS

Cladding

Optical pumping

Diffraction gratings

Diffraction

Adhesives

Fiber lasers

Tolerancing

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