Pump excited state absorption in holmium-doped fluoride glass

Librantz, André Felipe Henriques; Jackson, Stuart D.; Gomes, Laércio; Ribeiro, Sidney José Lima; Messaddeq, Younès

doi:10.1063/1.2833436

Cited by 49 publications

(14 citation statements)

References 23 publications

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“…By comparing results of fluorescence properties in various rare earth ions doped glasses, fluoride glasses possess significant advantages of high solubility for rare earth ions, long fluorescence lifetime of the excited electronic states as well as low nonlinear refractive index [16,[19][20][21][22]. Furthermore, the low maximum phonon energy make a great contribution to a reduction in the nonradiative loss [23].…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic properties and energy transfer process in Er3+ doped ZrF4-based fluoride glass for 2.7μm laser materials

Tian

et al. 2011

Optical Materials

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Section: Introductionmentioning

confidence: 99%

Spectroscopic properties and energy transfer process in Er3+ doped ZrF4-based fluoride glass for 2.7μm laser materials

Tian

et al. 2011

Optical Materials

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“…There have also been some more quantitative analyses on dye laser systems [5,6] and in the rather complex Er-doped [7] and Tm-doped [8] fibre laser systems, where up-conversion and cross-relaxation processes need to be considered alongside ESA. More recent work on Ho-doped fluoride [9] and Er-doped tellurite [10] glass fibre lasers has identified pump ESA as an important process in these systems.…”

Section: Introductionmentioning

confidence: 99%

Analysis of pump excited state absorption and its impact on laser efficiency

Kerridge-Johns

Damzen

2015

Laser Phys. Lett.

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Abstract. Excited state absorption (ESA) is a process that occurs in many laser gain media and can significantly impact their efficiencies of operation. In this work we develop a model to quantify the effect of ESA at the pump wavelength on laser efficiency, threshold and heating. In an analysis based on the common end pumped laser geometry we derive solutions and analytical expressions that model the laser behaviour. From these solutions we discuss the main parameters affecting efficiency, such as the laser cavity loss, pump ESA cross section and stimulated emission cross section. Methodologies are described to minimise the impact of pump ESA, for example by minimising cavity loss. It is also shown that altering the pumping geometry can significantly improve performance by improved distribution of the population inversion. Double end pumping can approximately halve the effect of pump ESA compared to single end pumping, and side pumping also has the potential to arbitrarily reduce its effect.

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“…The necessity for mid-power fiber lasers that effectively pump Tm3+-doped ZBLAN blue-UV emitting (upconversion) fiber lasers [1,2] and 3000-nm fiber lasers based on Ho3+-doped ZBLAN fibers for medical applications [3,4], together with the non-commercial availability of high power lasers in the 1100-1200 nm, motivated our research for a way to further optimize a well known approach that we used before, the Raman fiber laser (RFL). Apart from these motivations, a frequency-doubled version to 550-600 nm would benefit other medical applications and may serve to generate artificial stars that are used as guides for adaptive astronomical telescopes [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Shortening of a Raman fiber laser by inserting ytterbium doped fiber

Mejía¹,

Talavera²

2013

IOSRJEN

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-Once reached the threshold for operation, Raman fiber lasers with high output couplers convert the pump signal into stokes signals very efficiently. However, high threshold implies lower overall efficiency and hence the ratio slope efficiency-to-threshold power (i.e., the figure of merit) is low. By maintaining the slope efficiency value and decreasing threshold, the figure of merit (overall efficiency) increases. In this work, we have increased this parameter from 57 (for a typical Raman configuration) to 105 (investigated configuration). This represents an 84% improvement. A threshold of 2.9 watts decreased to 1.3 watts by inserting 1.27 m of ytterbium doped fiber into a 350-m Raman cavity. Another way for obtaining similar results was explored by enlarging the cavity more than double (to 750 m) but power delivery decreased by 20% due to additional fiber loss. The system studied is shorter and more efficient than typical configurations and might be considered given its simplicity. Advantages, disadvantages and other ways for obtaining similar results are discussed.

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Pump excited state absorption in holmium-doped fluoride glass

Cited by 49 publications

References 23 publications

Spectroscopic properties and energy transfer process in Er3+ doped ZrF4-based fluoride glass for 2.7μm laser materials

Spectroscopic properties and energy transfer process in Er3+ doped ZrF4-based fluoride glass for 2.7μm laser materials

Analysis of pump excited state absorption and its impact on laser efficiency

Shortening of a Raman fiber laser by inserting ytterbium doped fiber

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