Monolithic thulium fiber laser with 567  W output power at 1970  nm

Walbaum, Till; Heinzig, Matthias; Thomas, Sabu; Eberhardt, Ramona; Tünnermann, Andreas

doi:10.1364/ol.41.002632

Cited by 50 publications

(18 citation statements)

References 7 publications

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“…High-power solid-state lasers in the 2 µm spectral region are actively investigated due to their widespread applications in various fields such as eye-safe coherent laser radar for longrange hard-target measurement [1] , hard or soft tissue ablation owing to strong laser absorption by water molecules [2,3] , high-sensitivity global wind and active atmospheric remote sensing [4] , and pumping optical parametric oscillators for the development of mid-IR sources [5] . Current concepts for the power scaling of such 2 µm laser sources tend to use Tmor Ho-doped glass fibers [6,7] . However, stimulated Brillouin scattering, stimulated Raman scattering, optical damage and photo-darkening present serious limiting factors [8] .…”

Section: Introductionmentioning

confidence: 99%

35 W continuous-wave Ho:YAG single-crystal fiber laser

Zhao

Wang

Chen

et al. 2020

High Pow Laser Sci Eng

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We report on a high-power Ho:YAG single-crystal fiber (SCF) laser inband pumped by a high-brightness Tm-fiber laser at 1908 nm. The Ho:YAG SCF grown by the micro-pulling-down technique exhibits a propagation loss of $0.05\pm 0.005~\text{cm}^{-1}$ at $2.09~\unicode[STIX]{x03BC}\text{m}$ . A continuous-wave output power of 35.2 W is achieved with a slope efficiency of 42.7%, which is to the best of our knowledge the highest power ever reported from an SCF-based laser in the 2 $\unicode[STIX]{x03BC}\text{m}$ spectral range.

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Section: Introductionmentioning

confidence: 99%

35 W continuous-wave Ho:YAG single-crystal fiber laser

Zhao

Wang

Chen

et al. 2020

High Pow Laser Sci Eng

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“…It can effectively reduce the core's NA, which helps to reduce the number of guided modes in the core. Power levels of ~170 W with M 2 value of 1.02/1.03 from a 20 µm core with 65 µm pedestal with an estimated efficiency of ~58% [20], and ~567 W with a high M 2 value of ~2.6 from a 25 µm core with 40 µm pedestal with an efficiency of ~50% [21] have been demonstrated. Both fibers have nearly the same core Dn ~0.004 with respect to the pedestal and the pedestal Dn ~0.017 with respect to the cladding [22].…”

Section: Introductionmentioning

confidence: 93%

Breaking the Stringent Trade-Off Between Mode Area and NA for Efficient High-Power Fiber Lasers Around 2 μm

Jain

Sahu

Fleming

2020

J. Lightwave Technol.

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We propose a novel approach of exploiting the LP02 mode in ultra-high NA confined-doped M-type fibers to ensure effective single-mode operation, thereby breaking the trade-off between mode-area scaling and ultra-high NA. This novel approach opens the door to highly rare-earth doped fibers suitable for power scaling applications. Therefore enabling, simultaneously scaling of power and slope efficiency of fiber lasers.

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“…In particular the lower efficiency leads to a significantly enhanced heat-load upon amplification in comparison to YDFLs, which is the primary obstacle for average-power scaling. Thus, the average power demonstrated with TDFLs has been limited to the 1 kW-level in continuous wave operation [20,22,23] and to the 100 W-level in ultrafast systems [24,25]. Only recently we demonstrated an ultrafast TDFL with an average output power of more than 1 kW with near diffraction-limited beam quality [26].…”

Section: Introductionmentioning

confidence: 99%

Transverse mode instability and thermal effects in thulium-doped fiber amplifiers under high thermal loads

et al. 2021

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We experimentally analyze the average-power-scaling capabilities of ultrafast, thulium-doped fiber amplifiers. It has been theoretically predicted that thulium-doped fiber laser systems, with an emission wavelength around 2 µm, should be able to withstand much higher heat-loads than their Yb-doped counterparts before the onset of transverse mode instability (TMI) is observed. In this work we experimentally verify this theoretical prediction by operating thulium doped fibers at very high heat-load. In separate experiments we analyze the performance of two different large-core, thulium-doped fiber amplifiers. The first experiment aims at operating a short, very-large core, thulium-doped fiber amplifier at extreme heat-load levels of more than 300 W/m. Even at this extreme heat-load level, the onset of TMI is not observed. The second experiment maximizes the extractable average-output power from a large-core, thulium-doped, fiber amplifier. We have achieved a pump-limited average output power of 1.15 kW without the onset of TMI. However, during a longer period of operation at this power level the amplifier performance steadily degraded and TMI could be observed for average powers in excess of 847 W thereafter. This is the first time, to the best of our knowledge, that TMI has been reported in a thulium-doped fiber amplifier.

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Monolithic thulium fiber laser with 567 W output power at 1970 nm

Cited by 50 publications

References 7 publications

35 W continuous-wave Ho:YAG single-crystal fiber laser

35 W continuous-wave Ho:YAG single-crystal fiber laser

Breaking the Stringent Trade-Off Between Mode Area and NA for Efficient High-Power Fiber Lasers Around 2 μm

Transverse mode instability and thermal effects in thulium-doped fiber amplifiers under high thermal loads

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