Holmium fiber laser based on the heavily doped active fiber

Kurkov, Andrei S; Шолохов, Е.М.; Medvedkov, O.I.; Dvoyrin, Vladislav; Pyrkov, Yu. N.; Цветков, В. Б.; Marakulin, A V; Minashina, L A

doi:10.1002/lapl.200910056

Cited by 49 publications

(20 citation statements)

References 15 publications

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“…In comparison to thulium fibre lasers, the holmium emission provides efficient access to the 2070 nm -2150 nm wavelength range [1,2]. We present the first report of the tuneable range of a resonantly, cladding pumped holmium fibre laser.…”

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confidence: 92%

Tuneable operation of core and cladding pumped holmium fibre lasers

Simakov

Hemming

Clarkson

et al. 2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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Holmium fibre lasers are required for remote sensing, LIDAR and some medical applications. In comparison to thulium fibre lasers, the holmium emission provides efficient access to the 2070 nm -2150 nm wavelength range [1,2]. We present the first report of the tuneable range of a resonantly, cladding pumped holmium fibre laser. This is compared to the tuning range of a core pumped holmium doped fibre.Both lasers were pumped by a single mode thulium fibre laser at 1950 nm. The core pumped holmium doped fibre (HDF) had a doping concentration of 0.25 wt.%, core diameter of 10 µm, 0.15 numerical aperture (NA) and length of 2 m [3]. The cladding pumped fibre had a doping concentration of 0.5 wt.%, core diameter of 18 µm, 0.08 NA and length of 3.5 m [4]. The pump light was guided by a layer of fluorine doped silica with a NA of 0.2 around an octagonal shaped cladding (114 µm flat-to-flat). Both fibres had robustly single mode cores with a cut off wavelength of ~1950 nm. As shown in Figure 1a, the laser cavity was formed between a diffraction grating and a Fresnel reflection from the opposite end of the fibre.The tuning ranges of both fibres are shown on Figure 1b. The tuning range of the core-pumped system was limited by feedback occurring between the thulium pump and holmium emission at wavelengths below 2040 nm. At the longer wavelength end of the emission spectrum the operating wavelength was limited by parasitic lasing at ~2080 nm between the two perpendicularly cleaved fibre end facets and the diminishing small signal gain at wavelengths >2100 nm. The core pumped system reached a maximum power of 3.2 W at 2070 nm. The tuning range of the cladding pumped system was limited by parasitic lasing at ~2100 nm between the two perpendicularly cleaved end facets of the fibre; the cladding pumped system produced a maximum power of 14.4 W at 2105 nm. Both the core and cladding pumped lasers were limited in output power by the amount of pump delivered to the active fibre.

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mentioning

confidence: 92%

Tuneable operation of core and cladding pumped holmium fibre lasers

Simakov

Hemming

Clarkson

et al. 2013

2013 Conference on Lasers &Amp; Electro-Optics Europe &Amp; International Quantum Electronics Conference CLEO EUROPE/IQEC

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“…However, the efficiency and output power of TDFLs are relatively low [3] compared with that of YDFLs, and the cost of Tm-doped fiber components are rather high due to the immature development. As for the ~1150 nm pump scheme, which was first proposed by Kurkov et al [26], researchers have performed various experiments to investigate its feasibility and potential [19,[27][28][29][30], which indicate that high power HDFLs pumped at ~1150 nm are promising and feasible. However, the power of LDs at ~1150 nm is quite low due to its underdevelopment at present, and the power of YDFLs at ~1150 nm is also rather low due to the much small emission cross-sections and net gain in Yb-doped fiber, thus the output power of HDFLs pumped at this band is limited to 10 W for the time being [19].…”

Section: Introductionmentioning

confidence: 99%

Powerful 2-μm all-fiber laser sources pumped by Raman fiber lasers

Wang

Zhang

et al. 2014

SPIE Proceedings

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We present novel and powerful pump schemes for fiber laser sources operating near 2 μm, which employing high power Raman fiber lasers (RFLs) to provide sufficient pump light. Firstly, we demonstrate a Tm-doped fiber laser (TDFL) pumped by two RFLs at 1173 nm. The output power of the TDFL reached 96 W with slope efficiency of 0.42, and the central wavelength located at 1943.3 nm. This is the first TDFL with 100 W-level output power pumped by RFLs around Tm 3+ ions' ~1200 nm absorption band. Secondly, we demonstrate a Ho-doped fiber laser (HDFL) employing a 1150 nm RFL as pump source. The 1150 nm RFL provided 110 W pump power and the output power of the HDFL reached 42 W with slope efficiency of 0.37. The lasing wavelength covered from 2046.8 nm to 2049.5 nm with optical signal-to-noise ratio more than 30 dB. This is the first HDFL pumped by a 1150 nm RFL and the highest output power achieved at this pump band. In the last, we present a high power Ho-doped fiber (HDF) superfluorescent source (SS) pumped by a 1150 nm RFL. The SS's output power reached 1.5 W, and the full width at half maximum was about 30 nm. This is the highest output power achieved in HDF as far as we know. The results above indicate promising and powerful pump schemes to achieve higher power output in fiber lasers near 2 μm, which also can be further improved by optimizing the parameters of the sources.

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“…Previously, such fibers were used to get the efficient lasing in a range of 2.00 -2.15 μm [10][11][12]. To pump supercontinuum source we have used Q-switched Er-doped fiber laser emitting at 1.6 μm.…”

Section: Introductionmentioning

confidence: 99%