Numerical analysis of lasing characteristics in highly bend-compensated large-mode-area ytterbium-doped double-clad leakage channel fibers

G. Thavasi Raja; Raktim Halder; S. K. Varshney

doi:10.1364/AO.54.010314

Applied Optics
Vol. 54,
Issue 35,
pp. 10314-10320
(2015)
•https://doi.org/10.1364/AO.54.010314

Numerical analysis of lasing characteristics in highly bend-compensated large-mode-area ytterbium-doped double-clad leakage channel fibers

G. Thavasi Raja, Raktim Halder, and S. K. Varshney

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G. Thavasi Raja, Raktim Halder, and S. K. Varshney, "Numerical analysis of lasing characteristics in highly bend-compensated large-mode-area ytterbium-doped double-clad leakage channel fibers," Appl. Opt. 54, 10314-10320 (2015)

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Table of Contents Category
- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: September 7, 2015
- Revised Manuscript: November 10, 2015
- Manuscript Accepted: November 11, 2015
- Published: December 9, 2015

Abstract

The bend-induced mode-area reduction and thermal effects are vital factors that affect the power scaling of fiber lasers. Recently, bend-compensated large-mode-area double-clad modified hybrid leakage channel fiber (M-HLCF) has been reported with a mode area greater than $1000 {μm}^{2}$ , while sustaining the single-mode behavior at 1064 nm for high-temperature environments. In this work, the lasing characteristics of a newly designed ytterbium-doped double-clad M-HLCF (YDMHLCF) have been numerically investigated for strongly pumped conditions. The doped region size is optimally found through simulations, equivalent to the size of core diameter $\sim 38 μm$ in order to achieve maximum conversion efficiency for the bent and straight cases. Numerical simulations further confirm that a 2 m long YDMHLCF exhibits slope efficiency of 78% and conversion efficiency of 79% for the straight case and also almost the same for the practical bending radius of 7.5 cm when pumped with a 975 nm laser source.

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Parameter	Value
Meta-stable level lifetime, $τ$	$8.4 \times 10^{- 4} s$
Pump wavelength, $λ_{p}$	975 nm
Signal wavelength, $λ_{s}$	1064 nm
${Yb}^{3 +}$ ions density, $N$	$4 \times 10^{25} ions / m^{3}$
Absorption cross section at pump, $σ_{ap}$	$2.35 \times 10^{- 24} m^{2}$
Emission cross section at pump, $σ_{ep}$	$2.17 \times 10^{- 24} m^{2}$
Absorption cross section at signal, $σ_{as}$	$2.95 \times 10^{- 27} m^{2}$
Emission cross section at signal, $σ_{es}$	$2.5 \times 10^{- 25} m^{2}$
Scattering losses for pump, $α_{p}$	$0.006 m^{- 1}$
Scattering losses for signal, $α_{s}$	$0.005 m^{- 1}$
Pump overlap factor, $Γ_{p}$	$\sim 0.02$
Core diameter of YDMHLCF	$\sim 38 μm$
Input reflectivity, $R_{1}$ at 1064 nm	0.98
Output reflectivity, $R_{2}$ at 1064 nm	0.04

	Slope Efficiencies [%]
	$r_{d} = 10 μm$			$r_{d} = 19 μm$
Fiber Length L [m]	No bend	$R_{b} = 15 cm$	$R_{b} = 7.5 cm$	No bend	$R_{b} = 15 cm$	$R_{b} = 7.5 cm$
1.5	59	50	39	69	68	67
2	73	70	65	78	78	77

Parameter	Value
Meta-stable level lifetime, $τ$	$8.4 \times 10^{- 4} s$
Pump wavelength, $λ_{p}$	975 nm
Signal wavelength, $λ_{s}$	1064 nm
${Yb}^{3 +}$ ions density, $N$	$4 \times 10^{25} ions / m^{3}$
Absorption cross section at pump, $σ_{ap}$	$2.35 \times 10^{- 24} m^{2}$
Emission cross section at pump, $σ_{ep}$	$2.17 \times 10^{- 24} m^{2}$
Absorption cross section at signal, $σ_{as}$	$2.95 \times 10^{- 27} m^{2}$
Emission cross section at signal, $σ_{es}$	$2.5 \times 10^{- 25} m^{2}$
Scattering losses for pump, $α_{p}$	$0.006 m^{- 1}$
Scattering losses for signal, $α_{s}$	$0.005 m^{- 1}$
Pump overlap factor, $Γ_{p}$	$\sim 0.02$
Core diameter of YDMHLCF	$\sim 38 μm$
Input reflectivity, $R_{1}$ at 1064 nm	0.98
Output reflectivity, $R_{2}$ at 1064 nm	0.04

	Slope Efficiencies [%]
	$r_{d} = 10 μm$			$r_{d} = 19 μm$
Fiber Length L [m]	No bend	$R_{b} = 15 cm$	$R_{b} = 7.5 cm$	No bend	$R_{b} = 15 cm$	$R_{b} = 7.5 cm$
1.5	59	50	39	69	68	67
2	73	70	65	78	78	77

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Applied Optics