High-power 83 W holmium-doped silica fiber laser operating with high beam quality

Jackson, Stuart D.; Sabella, Alexander; Hemming, Alexander; Bennetts, Shayne; Lancaster, David G.

doi:10.1364/ol.32.000241

Cited by 111 publications

(28 citation statements)

References 13 publications

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“…The silicate fiber was approximately 1 m in length and doped at approximately 7 wt%. Cladding pumping at 793 nm of the Tm dopant in the TmHo co-doped silicate fiber resulted in excitation of the Ho ions, which provided the gain at 2 um [9]. We made gain measurements for both amplifier stages.…”

Section: Fiber Amplifier Development For the 2 µM Regionmentioning

confidence: 99%

Large core highly doped fiber amplifiers.

Dansson¹,

Moore²,

Soh³

et al. 2012

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We have demonstrated amplification of nanosecond optical pulses to the millijoule level using ytterbium-doped phosphate glass fibers. Fibers with 35 um and 49 um diameter cores produced up to 700 uJ and 2.25 mJ pulses, respectively, with pulse durations less than 10 ns. By tapering the diameter of the fiber from single-mode to multi-mode, we were able to produce output with a nearly lowest-order-mode spatial profile in 35 um-core fibers that were inherently multimode. We report on progress in five areas of amplifier development: (1) pulse energy, (2) fundamental mode propagation in multi-mode fibers, (3) phosphate glass fiber processing, (4) highly doped gain fiber modeling, and (5) amplification of single-frequency pulses at 2 um wavelength. 4 ACKNOWLEDGMENTS

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Section: Fiber Amplifier Development For the 2 µM Regionmentioning

confidence: 99%

Large core highly doped fiber amplifiers.

Dansson¹,

Moore²,

Soh³

et al. 2012

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“…Some important parameters calculated through the Judd-Ofelt analysis including spontaneous transition probabilities, branching ratios and radiative lifetimes of selected transitions are listed in Table I. It is seen that s rad of 5 27). Generally, the relatively longer radiation lifetime is beneficial to reduce the laser oscillation threshold.…”

Section: A Thermal Stabilitymentioning

confidence: 99%

“…4 To enhance pump absorption, Ho 3þ fibers have been sensitized with either Tm 3þ or Yb 3þ ions. 5,6 And a 2.1 lm Tm 3þ /Ho 3þ /Yb 3þ triply-doped tellurite fiber laser pumped using a 1.1 lm Yb 3þ -doped silica fiber laser has been demonstrated. 7 This illustrates that the sensitization by both Yb 3þ and Tm 3þ should provide a more efficient energy transfer route and more intense 2.0 lm emission than that by Yb 3þ or Tm 3þ alone.…”

Section: Introductionmentioning

confidence: 99%

Intense 2.0 μm emission properties and energy transfer of Ho3+/Tm3+/Yb3+ doped fluorophosphate glasses

Tian

et al. 2011

Journal of Applied Physics

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Intense 2.0 lm emission has been obtained from Ho 3þ /Tm 3þ /Yb 3þ triply doped fluorophosphate glass pumped by a conventional 980 nm laser diode. The spectroscopic properties and energy transfer mechanisms between Ho 3þ , Tm 3þ and Yb 3þ are analyzed. Based on the absorption spectra, the JuddOfelt parameters, radiation emission rates, radiative lifetime and branching ratios of Ho 3þ ions are calculated. It is also found that the 2.0 lm emission of Ho 3þ can be greatly enhanced under the excitation at 980 nm by incorporating Tm 3þ and Yb 3þ simultaneously. Additionally, the microparameters of the energy transfer processes are quantitatively analyzed. The energy transfer coefficient from Yb 3þ to acceptors and from Tm 3þ to Ho 3þ can reach as high as 13.14 Â 10 À40 cm 6 /s and 23.39 Â 10 À40 cm 6 /s, respectively. This Ho 3þ /Tm 3þ /Yb 3þ doped fluorophosphate glass possessing high energy transfer coefficient and excellent thermal stability is a promising candidate for efficient 2.0 lm laser.

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“…In this architecture 0.79 lm laser diodes can be used to excite thulium ions which then transfer energy to holmium ions via a resonant energy transfer mechanism. Sources based on this Tm:Ho codoping have been demonstrated in both pulsed and CW operation [4,5]. However, this approach is limited by bottle necking and up-conversion effects [6,7].…”

Section: Introductionmentioning

confidence: 99%