Transverse mode propagation studies in a thulium-doped fiber laser

Hu, Zhenyue; Yan, Ping; Liu, Qiang; Ji, Encai; Gong, Mali

doi:10.1364/josab.31.003181

Cited by 3 publications

(1 citation statement)

References 26 publications

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“…[19,20] We have proven the effectiveness of Jackson's model in previous work under different approximation conditions. [12,21,22] Similarly, we neglected the effects from ASE, excited state absorption (ESA), and energy transfer up-conversion (ETU), and assumed that the length of cavity was the same as that of the gain fiber. But here in the present paper, the expression of cross relaxation is the same as that from Frith's model, [20] and we only consider the spontaneous lifetimes to simplify the equations.…”

Section: Theoretical Analyses 21 Gain Distribution In Tdflmentioning

confidence: 99%

Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system

Ji¹,

Liu²,

Hu³

et al. 2015

Chinese Phys. B

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The steady-state gain distribution in cladding pumped thulium-doped fiber laser (TDFL) is analytically and numerically solved based on the rate equations including loss coefficients and cross relaxation effect. With the gain curve, a problem, which is named optical feedback inhibition (OFI) and always occurs in tandem TDFL-Ho:YAG laser system, is analyzed quantitatively. The actual characteristics of output spectra and power basically prove the conclusion of theoretical analysis. Then a simple mirror-deflected L-shaped cavity is employed to restrain the external feedback and simplify the structure of fiber-bulk Ho:YAG laser. Finally, 25 W of 2097-nm laser power and 51.2% of optical-to-optical conversion efficiency are obtained, and the beam quality factor is less than 1.43 obtained by knife-edge method.

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Section: Theoretical Analyses 21 Gain Distribution In Tdflmentioning

confidence: 99%

Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system

Ji¹,

Liu²,

Hu³

et al. 2015

Chinese Phys. B

Self Cite

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Universal Output Characteristics of Single-Mode Operation in Low-Loss Large- V -Number Multimode Waveguide Lasers with Transverse Spatial Hole Burning

2020

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Numerical modeling of an ASE suppression and power scalable approach in 1908 nm LMA-TDFO

Ren,

Qi,

et al. 2024

Opt. Express

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High-power Tm-doped fiber lasers operating at short wavelengths (< 1940 nm) are widely used in biomedical engineering, remote sensing, and pumping Ho-doped solid-state lasers. However, it is challenging to increase their output power. Amplified spontaneous emission (ASE) is a major bottleneck in scaling the power of Tm-doped fiber lasers operating at short wavelengths. This paper presents what we believe to be a novel approach for suppressing ASE and increasing output power in large-mode-area Tm-doped fiber oscillators (LMA-TDFOs) operating at short wavelengths. By designing a core with some particular doping profiles in LMA fibers, most ASE can be concentrated in the LP11 mode and suppressed by bending the fiber to a suitable radius. At the same time, the signal laser can be wholly coupled to the LP01 mode in the oscillator. A model describing the transverse mode competition and ASE is developed. A novel nested-ring doping scheme for LMA fibers is designed, and the output characteristics of a 1908 nm oscillator based on this scheme are numerically investigated. Theoretical analysis confirmed that this sophisticated doping design can effectively achieve the intended ASE suppression effect. Further simulations show that this method is expected to increase the output power of the 1908 nm LMA-TDFO to the kW level and has also demonstrated good practicability across a broader signal spectrum range (1848–1940 nm).

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Transverse mode propagation studies in a thulium-doped fiber laser

Cited by 3 publications

References 26 publications

Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system

Analysis of gain distribution in cladding-pumped thulium-doped fiber laser and optical feedback inhibition problem in fiber-bulk laser system

Universal Output Characteristics of Single-Mode Operation in Low-Loss Large- V -Number Multimode Waveguide Lasers with Transverse Spatial Hole Burning

Numerical modeling of an ASE suppression and power scalable approach in 1908 nm LMA-TDFO

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