High-power 1018 nm Yb<sup>3+</sup> doped fiber lasers with different YDF core and coiling diameters: theoretical and experimental study

Hassan Sarabi; Hamid Latifi; Hamid Latifi; Majid Lafouti; Hossein Fathi; Mohammad Rabiei; Saeed Sarikhani

doi:10.1364/AO.488252

Applied Optics
Vol. 62,
Issue 21,
pp. 5619-5626
(2023)
•https://doi.org/10.1364/AO.488252

High-power 1018 nm Yb³⁺ doped fiber lasers with different YDF core and coiling diameters: theoretical and experimental study

Hassan Sarabi, Hamid Latifi, Majid Lafouti, Hossein Fathi, Mohammad Rabiei, and Saeed Sarikhani

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Hassan Sarabi, Hamid Latifi, Majid Lafouti, Hossein Fathi, Mohammad Rabiei, and Saeed Sarikhani, "High-power 1018 nm Yb³⁺ doped fiber lasers with different YDF core and coiling diameters: theoretical and experimental study," Appl. Opt. 62, 5619-5626 (2023)

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Abstract

In this paper, the effect of the active fiber’s core/cladding area ratio on the output parameters of 1018 nm fiber lasers has been investigated. In this regard, we conducted a comprehensive study of two fiber lasers that utilized 25/400 and 30/250 µm ytterbium-doped fibers (YDFs), both theoretically and experimentally. The optimum length of YDFs required for 40 dB of amplified spontaneous emission suppression was calculated. Theoretical studies also identified the YDF breaking zone for lengths greater than the optimum. The experimental results showed that selecting the proper dimensions and coiling diameter for the active fiber significantly increased the power and efficiency of the YDF laser. We obtained an output power of 943 W with a 75.5% slope efficiency for the co-pumped 30/250 µm YDFL which, to the best of our knowledge, is the highest reported value for the 1018 nm co-pumped fiber laser. An analysis of the experimental and theoretical results revealed that YDFs with a core/cladding area ratio greater than 1% are more suitable for realizing a high-power 1018 nm fiber laser. The findings of this study are crucial for the development of high-power 1018 nm fiber lasers with improved performance.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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Output Power (W)	$M^{2}$ Factor	Slope Efficiency $η$ (%)	YDF Length (m)	Core/Clad Diameter (µm)	Area Ratio^a (%)	Publication Date	Reference
7.5	–	16	2.6	20/400	0.25	2011	[3]
85	$< 1.3$	71	4	15/130	1.33	2012	[4]
22.8	1.72	53	7	15/130	1.33	2012	[5]
309	–	71	4	30/250	1.44	2013	[6]
154	–	71	5	15/130	1.33	2015	[7]
476	–	78.2	3.5	30/250	1.44	2015	[8]
200^b	–	75	2	10/130	0.59	2015	[9]
107.5^b	$< 1.1$	63	3.7	15/130	1.33	2015	[10]
403	1.51	68	3.1	25/250	1.00	2015	[11]
43.6	–	–	2.6	10/130	0.59	2016	[12]
230^b	1.17	75	4.2	10/125	0.64	2016	[13]
126	–	75	3.5	25/250	1.00	2016	[14]
805	1.80	64.9	3	30/250	1.44	2017	[15]
112	–	69.3	3	30/250	1.44	2017	[16]
100^b	1.06	53	2.5	10/130	0.59	2017	[17]
307	1.17	75.9	1.1	15/130	1.33	2017	[18]
1150	1.96	82.9	3.2	30/250	1.44	2018	[19]
407	1.5	39.9	2.2	20/400	0.25	2018	[20]
472^b	1.17	49.4	2.8	20/400	0.25	2019	[21]
300	1.19	79.3	2.6	20/130	2.37	2019	[22]
557	1.97	57.5	2.8	25/400	0.39	This work
943	2.76	75.5	3.2	30/250	1.44

YDF (µm)	Area Ratio (%)	L (m)	Pump (W)	$Φ$ (cm)	Output (W)	H (%)	$M^{2}$	Reference
20/400	0.25	2.8	1020	12	472	49	1.17	[21]
				12	459	46.4	1.82	This work
25/400	0.39	3.0	1020	9	520	53.8	1.41
				20	557	57.5	1.97
				20	803	66.4	2.35
30/250	1.44	3.2	1250	30	856	67.7	2.52
				40	943	75.5	2.76

Output Power (W)	$M^{2}$ Factor	Slope Efficiency $η$ (%)	YDF Length (m)	Core/Clad Diameter (µm)	Area Ratio^a (%)	Publication Date	Reference
7.5	–	16	2.6	20/400	0.25	2011	[3]
85	$< 1.3$	71	4	15/130	1.33	2012	[4]
22.8	1.72	53	7	15/130	1.33	2012	[5]
309	–	71	4	30/250	1.44	2013	[6]
154	–	71	5	15/130	1.33	2015	[7]
476	–	78.2	3.5	30/250	1.44	2015	[8]
200^b	–	75	2	10/130	0.59	2015	[9]
107.5^b	$< 1.1$	63	3.7	15/130	1.33	2015	[10]
403	1.51	68	3.1	25/250	1.00	2015	[11]
43.6	–	–	2.6	10/130	0.59	2016	[12]
230^b	1.17	75	4.2	10/125	0.64	2016	[13]
126	–	75	3.5	25/250	1.00	2016	[14]
805	1.80	64.9	3	30/250	1.44	2017	[15]
112	–	69.3	3	30/250	1.44	2017	[16]
100^b	1.06	53	2.5	10/130	0.59	2017	[17]
307	1.17	75.9	1.1	15/130	1.33	2017	[18]
1150	1.96	82.9	3.2	30/250	1.44	2018	[19]
407	1.5	39.9	2.2	20/400	0.25	2018	[20]
472^b	1.17	49.4	2.8	20/400	0.25	2019	[21]
300	1.19	79.3	2.6	20/130	2.37	2019	[22]
557	1.97	57.5	2.8	25/400	0.39	This work
943	2.76	75.5	3.2	30/250	1.44

YDF (µm)	Area Ratio (%)	L (m)	Pump (W)	$Φ$ (cm)	Output (W)	H (%)	$M^{2}$	Reference
20/400	0.25	2.8	1020	12	472	49	1.17	[21]
				12	459	46.4	1.82	This work
25/400	0.39	3.0	1020	9	520	53.8	1.41
				20	557	57.5	1.97
				20	803	66.4	2.35
30/250	1.44	3.2	1250	30	856	67.7	2.52
				40	943	75.5	2.76

Abstract

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Equations (4)

Applied Optics