Materials for high-power fiber lasers

Kirchhof, J.; Unger, Sonja; Schwuchow, Anka; Grimm, Stephan; Reichel, V.

doi:10.1016/j.jnoncrysol.2006.02.061

Cited by 84 publications

(43 citation statements)

References 14 publications

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“…An alternative way to possibly detect the presence of Yb 2+ ions in UV-irradiated Yb/Al doped silica glass or NIR diode pumped Yb/Al fibers would be through photoluminescense. Characteristic Yb 2+ luminescence originating from 5d − 4 f transitions has earlier been reported around 520 nm in Yb/Al-doped silica preforms prepared under reducing conditions when excited in the 200 -450 nm range [16,6]. Kirchhof et al [17] have previously observed a luminescence in the 300 -800 nm range when exciting Yb/Al doped silica preforms with a deuterium light source.…”

Section: Resultsmentioning

confidence: 92%

Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers

Rydberg¹,

Engholm²

2013

Opt. Express

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Abstract:In this work we present experimental evidence that the valence instability of the ytterbium ion play a key role for the observed photodarkening mechanism in Yb-doped fiber lasers. Luminescence and excitation spectroscopy performed on UV irradiated Yb/Al doped silica glass preforms and near-infrared diode pumped photodarkened fibers show a concentration increase of Yb 2+ ions. A concentration decrease in Yb 3+ could also be observed for the UV irradiated preform. The findings contribute to an increased understanding of the kinetic processes related to photodarkening in Yb-doped high power fiber lasers.

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Section: Resultsmentioning

confidence: 92%

Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers

Rydberg¹,

Engholm²

2013

Opt. Express

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“…For many high-power applications ytterbium (Yb) doped fibers are the preferred choice as Yb 3+ ions have a broad emission (typically 975 -1200 nm), a long lifetime in the excited state, and can be incorporated in to the silica host in relatively high concentrations [1]. The ability to incorporate rare-earth (RE) ions into the glass preform in the gas-phase offers the potential for realizing complex preform designs.…”

Section: Introductionmentioning

confidence: 99%

Optical Fiber Fabrication Using Novel Gas-Phase Deposition Technique

Boyland

Webb

Yoo

et al. 2011

J. Lightwave Technol.

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Abstract-We report a highly versatile chemical-in-crucible preform fabrication technique suitable for gas-phase deposition of doped optical fibers. Aluminosilicate and ytterbium-doped phosphosilicate fibers are presented demonstrating the technique and its potential for realizing complex fiber designs which are suitable for the nextgeneration of high power fiber devices. The results show aluminum doped fiber with NA of 0.28 and ytterbium-doped fiber with a measured slope efficiency of 84 % with respect to pump launch power.

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“…This costs pump energy, hence the peak power of the first spike is reduced. The characteristic time for a completely relaxed cavity is given by the upper state life time of the Yb-ions τ Y b , which is 600-800 μs depending among others on the doping concentration [30]. By these arguments the region of reduced peak The off-time t off and the pump width t on , which is set equal to the spike delay (τ δ = t on ), are shown in the lower part.…”

Section: Discussionmentioning

confidence: 99%

Gain-switched CW fiber laser for improved supercontinuum generation in a PCF

et al. 2011

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Abstract:We demonstrate supercontinuum generation in a PCF pumped by a gain-switched high-power continuous wave (CW) fiber laser. The pulses generated by gain-switching have a peak power of more than 700 W, a duration around 200 ns, and a repetition rate of 200 kHz giving a high average power of almost 30 W. By coupling such a pulse train into a commercial nonlinear photonic crystal fiber, a supercontinuum is generated with a spectrum spanning from 500 to 2250 nm, a total output power of 12 W, and an infrared flatness of 6 dB over a bandwidth of more than 1000 nm with a power density above 5 dBm/nm (3 mW/nm). This is considerably broader than when operating the same system under CW conditions. The presented approach is attractive due to the high power, power scalability, and reduced system complexity compared to picosecond-pumped supercontinuum sources.

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Materials for high-power fiber lasers

Cited by 84 publications

References 14 publications

Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers

Experimental evidence for the formation of divalent ytterbium in the photodarkening process of Yb-doped fiber lasers

Optical Fiber Fabrication Using Novel Gas-Phase Deposition Technique

Gain-switched CW fiber laser for improved supercontinuum generation in a PCF

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