Athermal continuous-wave fiber amplifier

Nemova, Galina; Kashyap, Raman

doi:10.1016/j.optcom.2009.03.038

Cited by 20 publications

(17 citation statements)

References 14 publications

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“…It is important to emphasize that for radiation-balanced amplification, the absorbed power density has to be equal to the radiated power density at any point along the length of the fiber [14]. That is…”

Section: Theoretical Analysismentioning

confidence: 99%

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Laser induced cooling of solids

Kashyap

Nemova

2010

Phys. Status Solidi (c)

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Laser induced cooling of solids, also known as optical refrigeration, is different to laser cooling of atoms, and was originally proposed in 1929 by Pringsheim. It was not achieved experimentally until 1995 at the Los Alamos National Laboratory by Epstein's group. Since that time, several proposal for cooling have been made and demonstrated, pushing the achievable coldness towards cryogenic temperatures. In addition, radiation balanced lasers, in which heat is mitigated by laser cooling has also been implemented. This powerful technique enables the scaling of optical powers in lasers, has no moving parts and the electrical connections are entirely remote to the laser. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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Section: Theoretical Analysismentioning

confidence: 99%

“…2 Radiation-balanced fiber amplifier In this part of the paper we consider athermal fiber amplifiera, in which the lasing and cooling processes are realised with the same system of the ions [14]. We develop a theory presented in [10] for the case of the Yb 3+ -doped fluoride (ZBLAN) fiber amplifier.…”

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confidence: 99%

Laser induced cooling of solids

Kashyap

Nemova

2010

Phys. Status Solidi (c)

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“…In this context, Radiation-Balanced Lasers (RBL) were first introduced by Bowman in 1999 [10]. In radiation balancing, the heat that originates from the quantum defect of the laser as well as parasitic absorption can be removed by anti-Stokes fluorescence under a very subtle balance condition between different parameters of a laser (or an amplifier) [10,11,13]. In other words, the anti-Stokes fluorescence removes the excess heat generated in * mafi@unm.edu the medium.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Investigation of Yb -Doped Silica Glass for Solid-State Optical Refrigeration

et al. 2019

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We have argued that a high-purity Yb-doped silica glass can potentially be cooled via anti-Stokes fluorescence optical refrigeration. This conclusion is reached by showing, using reasonable assumptions for the host material properties, that the non-radiative decay rate of Yb ions can be made substantially smaller than the radiative decay rate. Therefore, an internal quantum efficiency of near unity can be obtained. Using spectral measurements of the fluorescence emission from a Ybdoped silica optical fiber at different temperatures, we estimate the minimum achievable temperature in Yb-doped silica glass for different values of internal quantum efficiency. arXiv:1810.06165v2 [physics.optics]

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“…As a subtle balance condition for RBL, the excess heat generated by the quantum defect and background absorption can be extracted by the anti-Stokes fluorescence cooling; therefore, the net heat can be zero. However, because the mean fluorescence wavelength of the ion-doped materials lies in the tail of the absorption cross-section spectrum, one should consequently expect some differences in the design of the radiation-balanced fiber lasers or amplifiers compared to the conventional Double Clad (DC) fiber lasers and amplifiers [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Heat mitigation of a core/cladding Yb-doped fiber amplifier using anti-Stokes fluorescence cooling

2019

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A Core/Cladding Yb-doped fiber amplifier configuration is presented that relies on anti-Stokes fluorescence cooling for effective heat mitigation in high-power operation. In the proposed design, the inner cladding of the double clad fiber is doped with the same ion as in the core; therefore, the excess heat generated from the background absorption is removed by the anti-Stokes fluorescence in both core and inner cladding. We consider both silica and ZBLAN glasses for the host material in the Core/Cladding Yb-doped fiber amplifier. The model incorporates the spatial profiles of the signal and pump intensities, as well as the amplified spontaneous emission. The total linear heat density and temperature distribution in the fiber amplifier are calculated. The results show that the anti-Stokes fluorescence cooling in the Core/Cladding Yb-doped configuration can mitigate the generated heat effectively in high-power operation, which obviates the need for an external cooling system. arXiv:1903.05738v3 [physics.optics]

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Athermal continuous-wave fiber amplifier

Cited by 20 publications

References 14 publications

Laser induced cooling of solids

Laser induced cooling of solids

Spectroscopic Investigation of Yb -Doped Silica Glass for Solid-State Optical Refrigeration

Heat mitigation of a core/cladding Yb-doped fiber amplifier using anti-Stokes fluorescence cooling

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