Narrow-linewidth high-efficiency single-frequency ytterbium-doped fiber laser with highly linear polarization at 1064 nm

Zhangni Qi; Zhangni Qi; Taoce Yin; Taoce Yin; Xiaogang Jiang; Xiaogang Jiang; Xiaogang Jiang; Feihong Chen; Feihong Chen; Sailing He; Sailing He

doi:10.1364/AO.420430

Applied Optics
Vol. 60,
Issue 10,
pp. 2833-2838
(2021)
•https://doi.org/10.1364/AO.420430

Narrow-linewidth high-efficiency single-frequency ytterbium-doped fiber laser with highly linear polarization at 1064 nm

Zhangni Qi, Taoce Yin, Xiaogang Jiang, Feihong Chen, and Sailing He

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Zhangni Qi, Taoce Yin, Xiaogang Jiang, Feihong Chen, and Sailing He, "Narrow-linewidth high-efficiency single-frequency ytterbium-doped fiber laser with highly linear polarization at 1064 nm," Appl. Opt. 60, 2833-2838 (2021)

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Abstract

We present a linearly polarized single-longitudinal-mode (SLM) ytterbium-doped fiber laser with a polarization extinction ratio (PER) of over 35 dB and a narrow linewidth of less than 4.5 kHz. The very high PER is obtained by utilizing the polarization evolution effect at the optical fiber and the high-performance polarizing beam splitter. The SLM is achieved by using a segment of polarization-maintaining ytterbium-doped fiber as a narrowband filter. In addition, a high optical signal-to-noise ratio of 50 dB and a good slope efficiency of 60.5% are achieved. Using an ytterbium-doped fiber amplifier, a linearly polarized SLM laser system with a high power of over 2.5 W is demonstrated at 1064 nm.

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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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Structures [References]	$λ_{l a s e r}$ (nm)	PER (dB)	Linewidth
Intra-cavity polarizer [8]	1064	16.7	0.175 nm
Intra-cavity Brewster-angle glass windows [9]	$\sim 1100$	16	$\sim 10 n m$
Based on polarization-depend bending loss [10]	1070	21.7	$> 0.4 n m$
Based on polarization-depend bending loss [11]	1085	$< 20$	1.9 nm
Polarization selection by FBGs [12]	1120	15	0.21 nm
Polarization selection by FBGs [13]	1064	23	52 pm
Polarization selection by FBGs [14]	1064	18	20 pm
Our structure (with intra-cavity PBS)	1064	$> 35$	$< 4.5 k H z$ (0.017 fm)

Structures [References]	$λ_{l a s e r}$ (nm)	Slope Efficiency	Linewidth (kHz)
Distributed feedback (DFB) laser [15]	1542.2	0.4%	6 kHz
Distributed Bragg reflector (DBR) laser [16]	1030	27%	6 kHz
Distributed Bragg reflector (DBR) laser [17]	1120	17.2%	5.7 kHz
Based on a saturable absorber filter [18]	1070	10.2%	$< 4.3 k H z$
Based on a saturable absorber filter [19]	1079.68	45.6%	6 kHz
Our structure (ultra-narrow bandwidth FBG)	1064	60.5%	$< 4.5 k H z$

Structures [References]	$λ_{l a s e r}$ (nm)	PER (dB)	Linewidth
Intra-cavity polarizer [8]	1064	16.7	0.175 nm
Intra-cavity Brewster-angle glass windows [9]	$\sim 1100$	16	$\sim 10 n m$
Based on polarization-depend bending loss [10]	1070	21.7	$> 0.4 n m$
Based on polarization-depend bending loss [11]	1085	$< 20$	1.9 nm
Polarization selection by FBGs [12]	1120	15	0.21 nm
Polarization selection by FBGs [13]	1064	23	52 pm
Polarization selection by FBGs [14]	1064	18	20 pm
Our structure (with intra-cavity PBS)	1064	$> 35$	$< 4.5 k H z$ (0.017 fm)

Structures [References]	$λ_{l a s e r}$ (nm)	Slope Efficiency	Linewidth (kHz)
Distributed feedback (DFB) laser [15]	1542.2	0.4%	6 kHz
Distributed Bragg reflector (DBR) laser [16]	1030	27%	6 kHz
Distributed Bragg reflector (DBR) laser [17]	1120	17.2%	5.7 kHz
Based on a saturable absorber filter [18]	1070	10.2%	$< 4.3 k H z$
Based on a saturable absorber filter [19]	1079.68	45.6%	6 kHz
Our structure (ultra-narrow bandwidth FBG)	1064	60.5%	$< 4.5 k H z$

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Applied Optics