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Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers

Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers
Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers
In this paper, we report the mode area scaling of a rare-earth doped step index fiber by using low numerical aperture. Numerical simulations show the possibility of achieving an effective area of ~700µm2 (including bend induced effective area reduction) at a bend diameter of 32cm from a 35µm core fiber with a numerical aperture of 0.038. An effective single mode operation is ensured following the criterion of the fundamental mode loss to be lower than 0.1dB/m while ensuring the higher order modes loss to be higher than 10dB/m at a wavelength of 1060nm. Our optimized modified chemical vapor deposition process in conjunction with solution doping process allows fabrication of an Yb-doped step index fiber having an ultra-low numerical aperture of ~0.038. Experimental results confirm a Gaussian output beam from a 35µm core fiber validating our simulation results. Fiber shows an excellent laser efficiency of ~81% and a M2 less than 1.1.
1094-4087
7407-7415
Jain, Deepak
787e5045-8862-46ba-b15e-82c2fe60495f
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Alam, Shaif-ul
2b6bdbe5-ddcc-4a88-9057-299360b93435
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2
Jain, Deepak
787e5045-8862-46ba-b15e-82c2fe60495f
Jung, Yongmin
6685e51e-be47-4c96-8c4b-65aee3b5126d
Barua, Pranabesh
ab53bdd9-e00f-46b0-b4f4-5ab6534fe8a6
Alam, Shaif-ul
2b6bdbe5-ddcc-4a88-9057-299360b93435
Sahu, Jayanta K.
009f5fb3-6555-411a-9a0c-9a1b5a29ceb2

Jain, Deepak, Jung, Yongmin, Barua, Pranabesh, Alam, Shaif-ul and Sahu, Jayanta K. (2015) Demonstration of ultra-low NA rare-earth doped step index fiber for applications in high power fiber lasers. Optics Express, 23 (6), 7407-7415. (doi:10.1364/OE.23.007407).

Record type: Article

Abstract

In this paper, we report the mode area scaling of a rare-earth doped step index fiber by using low numerical aperture. Numerical simulations show the possibility of achieving an effective area of ~700µm2 (including bend induced effective area reduction) at a bend diameter of 32cm from a 35µm core fiber with a numerical aperture of 0.038. An effective single mode operation is ensured following the criterion of the fundamental mode loss to be lower than 0.1dB/m while ensuring the higher order modes loss to be higher than 10dB/m at a wavelength of 1060nm. Our optimized modified chemical vapor deposition process in conjunction with solution doping process allows fabrication of an Yb-doped step index fiber having an ultra-low numerical aperture of ~0.038. Experimental results confirm a Gaussian output beam from a 35µm core fiber validating our simulation results. Fiber shows an excellent laser efficiency of ~81% and a M2 less than 1.1.

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Accepted/In Press date: 6 March 2015
Published date: 12 March 2015
Organisations: Optoelectronics Research Centre

Identifiers

Local EPrints ID: 375781
URI: https://eprints.soton.ac.uk/id/eprint/375781
ISSN: 1094-4087
PURE UUID: dce0f584-2690-4845-8b2d-ad21e2ff3165

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Date deposited: 14 Apr 2015 09:45
Last modified: 02 Dec 2019 20:37

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