Theoretical investigation on mid-infrared cascaded Raman fiber laser based on tellurite fiber

Chenquan Ni; Weiqing Gao; Xiangcai Chen; Li Chen; Yong Zhou; Wei Zhang; Jigang Hu; Meisong Liao; Takenobu Suzuki; Yasutake Ohishi

doi:10.1364/AO.56.009171

Applied Optics
Vol. 56,
Issue 33,
pp. 9171-9178
(2017)
•https://doi.org/10.1364/AO.56.009171

Theoretical investigation on mid-infrared cascaded Raman fiber laser based on tellurite fiber

Chenquan Ni, Weiqing Gao, Xiangcai Chen, Li Chen, Yong Zhou, Wei Zhang, Jigang Hu, Meisong Liao, Takenobu Suzuki, and Yasutake Ohishi

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Chenquan Ni, Weiqing Gao, Xiangcai Chen, Li Chen, Yong Zhou, Wei Zhang, Jigang Hu, Meisong Liao, Takenobu Suzuki, and Yasutake Ohishi, "Theoretical investigation on mid-infrared cascaded Raman fiber laser based on tellurite fiber," Appl. Opt. 56, 9171-9178 (2017)

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Abstract

A numerical simulation of third-order cascaded Raman fiber laser based on tellurite fiber at the 2–5 μm waveband is presented. The Raman fiber laser can be optimized with the most suitable tellurite fiber length of 0.5–1.0 m and the most reasonable reflectivity of the third-order Stokes output FBG32 of 10%–20%. We demonstrate numerically that the third-order Stokes wave can reach the maximum average power of 45.2 W and the maximum optical conversion efficiency of 45.2%, corresponding to the FBG32 reflectivity of 10% and the tellurite fiber length of 0.3 m with the attenuation of 0.85 dB/m, when pumped by 2 μm light with the average power of 100 W. Our simulated results provide valuable theoretical guidance for the design and experiment of tellurite Raman fiber laser at a mid-infrared waveband.

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Properties	Tellurite	Fluoride	Chalcogenide
Max. phonon energy ( ${cm}^{- 1}$ )	700	560	300–450
Transparency (μm)	0.5–5	0.4–6	1–16
Refractive index at 1.55 μm	2–2.2	$\sim 1.5$	2.3–3
Nonlinear refractive index ( $\times 10^{- 20} m^{2} / W$ )	59	2–3	300–500
Gain coefficient at 1.5 μm ( $\times 10^{- 12} m / W$ )	4.52–6.82	$3.25 \times 10^{- 2}$	4.3–5.7
Raman shift ( ${cm}^{- 1}$ )	750	550	250–350
ZDW (μm)	$\sim 2$	$\sim 1.7$	$> 5$
Reported lowest loss (dB/m)	0.02	$0.45 \times 10^{- 3}$	0.023
Melting point (°C)	500	265	250
Durability	Good	Poor	Good
Toxicity	Safe	High	High

Properties	Parameters
Gain coefficient at 1.5 μm ( $\times 10^{- 12} m / W$ )	5.67
Raman shift ( ${cm}^{- 1}$ )	750
Fiber length (m)	0.1–5
Core diameter (μm)	6
Attenuation (dB/m)	0–1

Properties	Tellurite	Fluoride	Chalcogenide
Max. phonon energy ( ${cm}^{- 1}$ )	700	560	300–450
Transparency (μm)	0.5–5	0.4–6	1–16
Refractive index at 1.55 μm	2–2.2	$\sim 1.5$	2.3–3
Nonlinear refractive index ( $\times 10^{- 20} m^{2} / W$ )	59	2–3	300–500
Gain coefficient at 1.5 μm ( $\times 10^{- 12} m / W$ )	4.52–6.82	$3.25 \times 10^{- 2}$	4.3–5.7
Raman shift ( ${cm}^{- 1}$ )	750	550	250–350
ZDW (μm)	$\sim 2$	$\sim 1.7$	$> 5$
Reported lowest loss (dB/m)	0.02	$0.45 \times 10^{- 3}$	0.023
Melting point (°C)	500	265	250
Durability	Good	Poor	Good
Toxicity	Safe	High	High

Properties	Parameters
Gain coefficient at 1.5 μm ( $\times 10^{- 12} m / W$ )	5.67
Raman shift ( ${cm}^{- 1}$ )	750
Fiber length (m)	0.1–5
Core diameter (μm)	6
Attenuation (dB/m)	0–1

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Applied Optics