Direct measurement of laser cooling of Yb:YAG crystal at atmospheric pressure using a fiber Bragg grating

Filho, Elton Soares de Lima; Nemova, Galina; Loranger, Sébastien; Kashyap, Raman

doi:10.1117/12.2040088

Cited by 4 publications

(3 citation statements)

References 48 publications

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“…The use of a fiber Bragg grating (FBG) to measures the surface temperature of the cooled sample in air by contact for laser cooling measurements was originally proposed [9] and demonstrated [10] by our group. Recently a temperature drop of 8.8 K from the chamber temperature was observed in the Yb 3+ :YAG crystal in air when pumped with 4.2 W at 1029 nm, close to 8.9 K observed in vacuum [11]. Also the laser cooling process with anti-Stokes fluorescence in Yb 3+ :YAG samples with different ion concentrations, shapes and sizes ranging from centimeter to the nanometer scale were investigated [12].…”

Section: Introductionmentioning

confidence: 74%

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Photonic properties of novel Yb3+ doped germanium-lead oxyfluoride glass-ceramics for laser cooling applications

Maia

Thomas

Ledemi

et al. 2018

Front. Optoelectron.

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In recent years, our research group has developed and studied new rare-earth doped materials for the promising technology of solid-state laser cooling, which is based on anti-stokes fl uorescence. To the best of our knowledge, our group is the only one in Canada leading the research into the properties of nanoparticles, glasses and glass-ceramics for optical refrigeration applications. In the present work, optical properties of 50GeO 2-30PbF 2-18PbO-2YbF 3 glass-ceramics for laser cooling are presented and discussed as a function of crystallization temperature. Spectroscopic results show that samples have near infrared photoluminescence emission due to the 2 F 5/2-2 F 7/2 Yb 3+ transition, centered at ~1016 nm with an excitation wavelength of 920 nm or 1011 nm, and the highest photoluminescence emission effi ciency occurs for heat-treatment for 5 h at 350°C. The internal photoluminescence quantum yield varies between 99% and 80%, depending on the temperature of heat-treatment, being the most effi cient under 1011 nm excitation. The 2 F 5/2 lifetime increases from 1.472 to 1.970 ms for heat treatments at 330°C to 350°C, respectively, due to energy trapping and the low phonon energy of the nanocrystals. The sample temperature dependence was measured with a fi ber Bragg grating sensor, as a function of input pump laser wavelength and processing temperature. These measurements show that the heating process approaches near zero for an excitation wavelength between 1020 and 1030 nm, which is an indication that phonons are removed effectivelly from the glass-ceramic materials, and they can be used for optical laser cooling applications. On the other hand, the temperature increase as a function of input laser power into samples remains constant between 920 and 980 nm wavelength excitation, a temperature variation of 36 K/W (temperature of 58°C/W) was attained under excitation at 950 nm, showing a possible use for biomedical applications to be explored.

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Section: Introductionmentioning

confidence: 74%

“…Finally, temperature measurements were performed using a direct contact FBG technique, as reported in previous works [11,15]. To this, we used a fiber laser operating at 1536 nm and the reflected signal was detected and analyzed by an OBR4600 instrument (Luna Technologies).…”

Section: Methodsmentioning

confidence: 99%

Photonic properties of novel Yb3+ doped germanium-lead oxyfluoride glass-ceramics for laser cooling applications

Maia

Thomas

Ledemi

et al. 2018

Front. Optoelectron.

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“…The FBG temperature is interrogated by a narrow wavelength probe and an optical fiber power meter. The complete details of the method are explained elsewhere [21].…”

Section: Calorimetrymentioning

confidence: 99%

Prospects of optical refrigeration in oxyfluoride glasses and glass-ceramics: experiments

Filho

Ledemi³

et al. 2015

SPIE Proceedings

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We report on the characterization of oxyfluoride glasses and glass ceramics for their application in optical refrigeration. Oxide glasses are chemically and mechanically stable and relatively ease to handle and fabricate, but their high maximum phonon energy leads to a nonradiative decay rate which is unacceptable for optical refrigeration. On the other hand, low-maximum phonon energy hosts such as fluorides lack the desirable mechanical and chemical stabilities to make them widely used. The combination of the high chemical and mechanical stability of oxides and the low maximum phonon energy of fluorides make oxyfluorides strong potential candidates for wide-spread use in optical refrigeration. Glasses and ultra-transparent glass-ceramics of molar composition 30SiO 2 -15Al 2 O 3 -(27-x)CdF 2 -22PbF 2 -4YF 3 -xYbF 3 , with x = (2, 5, 8, 12, 16 and 20) mol % are investigated. The absorption and photoluminescence spectra, as well as the lifetime and the external quantum efficiency of the photoluminescence for these samples using an integrating sphere are reported. The effects of reabsorption on the measured mean fluorescence wavelength are also reported. The cooling efficiencies of the samples were measured as a function of the pump wavelength using a calorimetric method with a Ti:Sapphire laser pump source and a fiber Bragg grating sensor for a direct temperature measurement. Impurities and background absorption are also investigated using different pump sources and the calorimetric method. From a comparison of the cooling/heating performance of the oxyfluoride glasses and glass-ceramics containing various Yb 3+ amounts, we developed a strategy to realize and enhance optical refrigeration in this class of material.

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Fiber Bragg gratings for low-temperature measurement

Filho¹,

Baiad²,

Gagné³

et al. 2014

Opt. Express

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We demonstrate the use of fiber Bragg gratings (FBGs) as a monolithic temperature sensor from ambient to liquid nitrogen temperatures, without the use of any auxiliary embedding structure. The Bragg gratings, fabricated in three different types of fibers and characterized with a high density of points, confirm a nonlinear thermal sensitivity of the fibers. With a conventional interrogation scheme it is possible to have a resolution of 0.5 K for weak pure-silica-core FBGs and 0.25 K using both boron-doped and germanium-doped standard fibers at 77 K. We quantitatively show for the first time that the nonlinear thermal sensitivity of the FBG arises from the nonlinearity of both thermo-optic and thermal expansion coefficients, allowing consistent modeling of FBGs at low temperatures.

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Direct measurement of laser cooling of Yb:YAG crystal at atmospheric pressure using a fiber Bragg grating

Cited by 4 publications

References 48 publications

Photonic properties of novel Yb3+ doped germanium-lead oxyfluoride glass-ceramics for laser cooling applications

Photonic properties of novel Yb3+ doped germanium-lead oxyfluoride glass-ceramics for laser cooling applications

Prospects of optical refrigeration in oxyfluoride glasses and glass-ceramics: experiments

Fiber Bragg gratings for low-temperature measurement

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