Thermal modeling of resonantly pumped high power Tm-doped fiber amplifiers

Tao, Mengmeng; Ye, Jingfeng; Ye, Xisheng; Gao, Feng; Wang, Yamin; Yu, Ting; Qi, Yunfeng; Zhao, Qian; Chen, Weibiao

doi:10.1016/j.rinp.2022.105407

Cited by 8 publications

(4 citation statements)

References 48 publications

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“…[5][6][7] Even in the case of resonant pumping of Tm-doped fiber lasers, a high efficiency was demonstrated, 1, 8, 9 but some complex sources (like fiber Raman laser), whose performance and efficiency are limited, were usually used for pumping. At the same time, the model presented by Tao et al 10 suggests that resonant pumping of Tm-fibers is the way to achieve power far exceeding 1 kW. In this context it is also important to mention that spectroscopic investigations show that Tm 3+ absorption within the resonant-pumping transition band is comparably strong to the 0.8 µm pumping case, both for solid-state laser media but also for Tm 3+ -doped fused silica fibers.…”

Section: Introductionmentioning

confidence: 98%

Tm-fiber laser resonantly pumped by 1.7 um laser diode

Šulc,

Němec,

Kratochvíl

et al. 2024

Fiber Lasers XXI: Technology and Systems

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Thulium-doped double-clad fiber (Nufern, LMA-TDF-25/250, 3 m long) based laser was tested under resonant excitation. As a source of pumping radiation at 1.7 µm a fiber-coupled laser diode was used (fiber diameter 400 µm, maximum power 25 W). Fiber laser resonator consisted of dichroic (high reflectivity at 2 µm, high transparency at 1.7 µm) free-space plane mirror, placed between lenses used to collimate and to focus the pumping radiation, and Fresnell reflection of active fiber end which serves as an output coupler. Under CW pumping this Tm-laser generated laser radiation at wavelength 1972 nm with power up to 4.5 W for absorbed pumping power 11 W. The laser efficiency in respect to absorbed pumping power was 63 % in this simple configuration. The goal of our work is to attract attention to the possibility of pumping thulium fiber lasers resonantly using laser diodes that are already readily available today. Thanks to resonance pumping, compared to cross-relaxation pumping at 0.8 µm, it can be achieved higher efficiency and lower heat generation, which can help to reach high mean powers from thulium fiber lasers. An important fact is that both the generated laser radiation and pumping radiation belong to the eye-safe spectral region, which reduces the risk of vision damage.

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Section: Introductionmentioning

confidence: 98%

Tm-fiber laser resonantly pumped by 1.7 um laser diode

Šulc,

Němec,

Kratochvíl

et al. 2024

Fiber Lasers XXI: Technology and Systems

View full text Add to dashboard Cite

show abstract

“…Even in the case of resonant pumping of Tm-doped fiber lasers, a high efficiency was demonstrated, [3,20,21] but some complex sources (like fiber Raman laser), whose performance and efficiency are limited, were usually used for pumping. At the same time, the model presented by Tao et al [22] suggests that resonant pumping of Tm-fibers is the way to achieve power far exceeding current limits. In this context it is also important to mention that spectroscopic investigations show that Tm 3+ absorption within the resonant-pumping transition band is comparably strong to the 0.8 𝜇m pumping case, both for numerous solid-state laser media but also for Tm 3+ -doped fused silica fibers.…”

Section: Introductionmentioning

confidence: 99%

Highly-efficient Tm-fiber Laser Resonantly Pumped by 1.7 μm Laser Diode

Sulc,

Nemec,

Kratochvíl

et al. 2024

Preprint

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CW laser diode emitting at 1.7 μm was used to unidirectionally pump a thulium-doped fiber laser. Cladding-pumped fiber laser resonator consisted of dichroic (high reflectivity at 2 μm, high transparency at 1.7 μm) free-space plane mirror, placed between two lenses used to collimate and to focus the pumping radiation, and Fresnell reflection of active fiber end which serves as an output coupler. For absorbed power 11.5 W output power 5.2 W was reached at wavelength 1950 nm with slope efficiency 70 %. The goal of our work is to attract attention to the possibility of pumping thulium fiber lasers resonantly using laser diodes that are already readily available today. Thanks to resonant pumping, compared to cross-relaxation-assisted pumping at 0.8 μm, higher efficiency and lower heat generation can be achieved, which can help to reach high mean powers from thulium fiber lasers. An important fact is that both the generated laser radiation and pumping radiation belong to the eye-safe spectral region, which reduces the risk of vision damage.

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“…In high power lasers, it is very important to estimate heat distribution in fiber and predict the temperature impact on fiber laser system due to temperature induced changes of TDF spectroscopic properties and design an effective cooling method. Surprisingly, low attention was devoted to the temperature effects on laser operation due to the temperature dependence of cross sections and only in a few models 5,6,7 approximate core-temperature dependence was considered. Recently, measurement of silica TDF emission and absorption cross sections for temperature range −196 °C to 300 °C was done and a temperature-dependent multi-gaussian empirical approximation for the cross sections was presented 4 .…”

Section: Introductionmentioning

confidence: 99%

The effect of temperature dependence of thulium cross sections on thulium-doped fiber laser operation

Schreiber¹,

Jirickova²,

Aubrecht³

et al. 2023

Fiber Lasers XX: Technology and Systems

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We report on the first measurement of the temperature dependent silica thulium-doped fiber absorption and emission cross-sections in the spectral range 700–2200 nm for a temperature range −196–300 °C. Using this data, we simulated the effect of temperature-induced shift of cross-sections on high power thulium-doped fiber laser (TDFL) performance when clad-pumped at 790 nm. The simulations show considerable impact on TDFL threshold and efficiency for shorter fiber length. The effect is most apparent for amplifier setup, especially with strong amplified spontaneous emission.

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Thermal modeling of resonantly pumped high power Tm-doped fiber amplifiers

Cited by 8 publications

References 48 publications

Tm-fiber laser resonantly pumped by 1.7 um laser diode

Tm-fiber laser resonantly pumped by 1.7 um laser diode

Highly-efficient Tm-fiber Laser Resonantly Pumped by 1.7 μm Laser Diode

The effect of temperature dependence of thulium cross sections on thulium-doped fiber laser operation

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