Effects of background spectral noise in the phase-modulated single-frequency seed laser on high-power narrow-linewidth fiber amplifiers

Wei Liu; Jiaxin Song; Pengfei Ma; Hu Xiao; Pu Zhou

doi:10.1364/PRJ.414223

Journals >Photonics Research >Volume 9 >Issue 4 >Page 424 > Article

Photonics Research
Vol. 9, Issue 4, 424 (2021)

Effects of background spectral noise in the phase-modulated single-frequency seed laser on high-power narrow-linewidth fiber amplifiers

Wei Liu¹, Jiaxin Song¹, Pengfei Ma^1、2、*, Hu Xiao¹, and Pu Zhou^1、3、*

Author Affiliations

¹College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China

²e-mail: shandapengfei@126.com

³e-mail: zhoupu203@163.com

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DOI: 10.1364/PRJ.414223 Cite this Article Set citation alerts

Wei Liu, Jiaxin Song, Pengfei Ma, Hu Xiao, Pu Zhou. Effects of background spectral noise in the phase-modulated single-frequency seed laser on high-power narrow-linewidth fiber amplifiers[J]. Photonics Research, 2021, 9(4): 424 Copy Citation Text

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Normalized temporal and spectral intensity of the constructed phase-modulated single-frequency part (first line) and background spectral noise (second line): (a), (c) normalized temporal intensity; (b), (d) normalized spectral intensity.

Fig. 1. Normalized temporal and spectral intensity of the constructed phase-modulated single-frequency part (first line) and background spectral noise (second line): (a), (c) normalized temporal intensity; (b), (d) normalized spectral intensity.

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Fig. 2. Output powers and spectra of the total signal laser at different pump powers: (a) output power; (b) output spectra.

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Fig. 3. Power-ratio spectral linewidths of total signal laser at different output powers.

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Fig. 4. Power evolutions of the two spectral components along the fiber amplifier.

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Fig. 5. Normalized spectral evolutions along the fiber amplifier: (a) the phase-modulated single-frequency part; (b) the background spectral noise.

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Fig. 6. Output spectrum of the total signal laser at a pump power of 2 kW when ignoring FWM terms in the simulation.

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Fig. 7. Power-ratio spectral linewidths of the total signal laser at a pump power of 2 kW when the power ratio or the bandwidth of the background spectral noise is different: (a) the power ratio is different; (b) the bandwidth is different.

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Fig. 8. Power-ratio spectral linewidths of the total signal laser at a pump power of 2 kW when the power ratio of the backward pump power is different.

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Fig. 9. Experimental setup of the fiber amplifier.

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Fig. 10. Normalized measured and simulated spectra of the fiber amplifier at different output powers: (a) seed laser; (b) 0.48 kW; (c) 0.99 kW; (d) 1.51 kW.

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Fig. 11. Ninety-nine percent power-ratio spectral linewidths of the total signal laser at different output powers when the experimental setups are different.

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Parameter	Value	Parameter	Value
$λ_{p}$	976 nm	$λ_{s}$	1080 nm
$α$	1.5 dB/km	$γ$	$0.5 W^{- 1} / km$
$Γ_{p}$	0.0025	$Γ_{s}$	0.85
$L_{act}$	15 m	$L_{pas}$	1 m
$τ$	0.84 ms	$N$	$7.8 \times 10^{25}$
$σ_{p}^{a}$	$1.77 \times 10^{- 24} m^{2}$	$σ_{p}^{e}$	$1.71 \times 10^{- 24} m^{2}$
$σ_{s}^{a}$	$2.29 \times 10^{- 27} m^{2}$	$σ_{s}^{e}$	$2.82 \times 10^{- 25} m^{2}$
$β_{2}$	$12 {ps}^{2} / km$	$P_{seed}$	50 W
$d t$	$1 \times 10^{- 13} s$	$T_{\max}$	$5 \times 10^{- 8} s$