Improvement of infrared laser properties of Nd:CaF_2 crystals via codoping with Y^3+ and Lu^3+ buffer ions

Doualan, Jean‐Louis; Su, Liangbi; Brasse, Gurvan; Benayad, Abdelmjid; Ménard, V.; Zhan, Yaoyu; Braud, Alain; Camy, Patrice; Xu, Jianming; Moncorgé, R.

doi:10.1364/josab.30.003018

Cited by 61 publications

(40 citation statements)

References 18 publications

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“…By codoping with Y 3+ CW laser operation was obtained for the first time in Nd 3+ (2at.%) heavily doped CaF 2 crystal with the output power of 25 mW and a slope efficiency of 5% at 1.055µm [16]. Then in 0.5%Nd,5%Lu:CaF 2 crystal a slope efficiency of 50% was approached, higher than that of 33% in 1%Nd,5%Y:CaF 2 [17].…”

Section: Introductionmentioning

confidence: 94%

Nd,Y:CaF₂laser crystals: novel spectral properties and laser performance from a controlled local structure

et al. 2015

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A series of Nd,Y:CaF 2 single crystals grown by TGT method were studied systematically by absorption, excitation and luminescence spectra, and extended x-ray absorption fine structure (EXAFS). The incorporation of Y 3+ substantially manipulated the local structure of Nd ions in CaF 2 crystal lattice. Subsequently, the changes of the local structure of Nd 3+ ions induced the substantial variations of the photoluminescence parameters, including FWHM, cross section, lifetimes and quantum efficiency. Preliminary laser experiments were carried out with 0.5%Nd,10%Y:CaF 2 , 0.8%Nd,5%Y:CaF 2 and 0.8%Nd,10%Y:CaF 2 crystals under LD pumping, true CW laser operation were achieved with slope efficiency of 30.1%, 19.3% and 24.9% respectively. concentration from 0.8% to 0.5% with the same Y 3+ concentration of 10%, the laser slope efficiency reached up to 30.1% with the maximum output power of 873 mW and absorbed pumping threshold power of 87 mW. ConclusionThe work discussed the codoping effect of Y 3+ ions on local structures of Nd 3+ and spectroscopic properties of Nd,Y:CaF 2 crystals. Codoping of Y 3+ , one Nd 3+ in [Nd 3+ -Nd 3+ ] pairs would be substituted by Y 3+ , quenching centers [Nd 3+ -Nd 3+ ] n were annihilated and non-quenching centers [Nd 3+ -nY 3+ ] formed, bond length of Nd-F and coordination number of Nd 3+ increased.Emission intensity and emission cross section were improved obviously, lifetimes increased by 20 times in maximum and quantum efficiency improved by 21 times in maximum. Emission lifetimes and quantum efficiency were also improved. For Nd 3+ concentration ranging from 4% to 0.5%, fluorescence lifetime and quantum efficiency of 0.5%Nd, 0.8%Nd, 1%Nd series crystals were higher than that in 2%Nd, 3%Nd, 4%Nd crystals. These offered us valuable data to find the optimal proportions of Nd 3+ /Y 3+ to achieve good laser performance. True CW laser operation were achieved in 0.5%Nd,10%Y:CaF 2 , 0.8%Nd,5%Y:CaF 2 and 0.8%Nd,10%Y:CaF 2 crystals under LD pumping, with slope efficiency of 30.1%, 19.3% and 24.9% respectively.

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Section: Introductionmentioning

confidence: 94%

Nd,Y:CaF₂laser crystals: novel spectral properties and laser performance from a controlled local structure

et al. 2015

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“…Namely, although laser action of Nd 3 has been demonstrated in a large number of crystals and glasses, the search for Nd 3 -doped new solid-state laser hosts having specific thermo-mechanical and optical properties is still very active. This is the case for the instance of the recently developed CaF 2 laser crystal codoped with Nd 3 and Lu 3 or Y 3 ions, because of the conjunction of good thermo-mechanical properties, typical of crystals, and broadband spectral properties, typical of glasses [2]. This is also the case for some Nd-doped nonlinear tellurite glasses [3][4][5][6][7][8][9], because of a very interesting combination of large nonlinear refractive index (25 times larger than that of silica) and wide transmittance range, and also because of a low maximum phonon frequency which allows rare-earth ion laser emissions in a wide spectral range [10].…”

Section: Introductionmentioning

confidence: 99%

Laser emission of a Nd-doped mixed tellurite and zinc oxide glass

et al. 2014

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The present work reports the luminescence properties and the laser operation of a Nd 3 -doped (TeO 2 -ZnO) bulk tellurite glass. The spectroscopic data are analyzed within the framework of the Judd-Ofelt formalism and the results are used in conjunction with fluorescence lifetime and emission measurements to derive values for the quantum efficiency and the stimulated emission cross section of the considered 4 F 3∕2 → 4 I 11∕2 infrared laser transition around 1062.5 μm. Continuous-wave laser action is achieved for the first time with this bulk tellurite glass by pumping the sample inside a standard two-mirror laser cavity with different output couplers. A low-threshold pump power of 8 mW associated with a laser slope efficiency of 21% could be obtained for an output coupler transmission of 2.7%.

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“…states. [17][18][19][20] The absorption peaks a-f centered at 519, 580, 675, 740, 797 and 864 nm correspond to the 4 I 9/2 → 4 G 9/2 + 2 K 13/2 + 4 G 7/2 , 4 I 9/2 → 4 G 5/2 + 2 G 7/2 , 4 I 9/2 → 4 F 9/2 , 4 I 9/2 → 4 F 7/2 + 4 S 3/2 , 4 I 9/2 → 4 F 5/2 + 2 H 9/2 , and 4 I 9/2 → 4 F 3/2 Nd 3+ transitions, respectively. Figure 5 exemplifies the optical transmittance spectrum of the Ca 1−x F 2+x :Nd x ceramics.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Characterization of Nd<SUP>3+</SUP>-Doped CaF<SUB>2</SUB> Nanoparticles

Yuan¹,

Li²,

Mei³

et al. 2015

j nanosci nanotechnol

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The Ca(1-x)F(2+x):Nd(x) nanoparticles were synthesized by chemical direct precipitation method. X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Image analyzer, absorption spectrum and transmittance were taken to characterization the phases, morphologies, sizes, size distribution and optical properties of the samples. The results indicate that the Ca(1-x)F(2+x):Nd(x) samples can be rationally modified in size and morphology by altering the Nd3+ ions doping concentration. With increasing concentration of Nd3+ ions, the particle size decreased from 24 to 14 nm, the intensity of the diffraction peaks decreased, the Ca(1-x)F(2+x):Nd(x) particles aggregated ion of the formed clusters which should have an effect on both speed and orientation of the particles growth. The transmittance of ceramics with a thickness of 2 mm showed that the transmittance can reach 90% when the doping concentration was 5%, which should be profitable for LD pumping.

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Improvement of infrared laser properties of Nd:CaF_2 crystals via codoping with Y^3+ and Lu^3+ buffer ions

Cited by 61 publications

References 18 publications

Nd,Y:CaF₂laser crystals: novel spectral properties and laser performance from a controlled local structure

Nd,Y:CaF₂laser crystals: novel spectral properties and laser performance from a controlled local structure

Laser emission of a Nd-doped mixed tellurite and zinc oxide glass

Synthesis and Characterization of Nd<SUP>3+</SUP>-Doped CaF<SUB>2</SUB> Nanoparticles

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Improvement of infrared laser properties of Nd:CaF_2 crystals via codoping with Y^3+ and Lu^3+ buffer ions

Cited by 61 publications

References 18 publications

Nd,Y:CaF2laser crystals: novel spectral properties and laser performance from a controlled local structure

Nd,Y:CaF2laser crystals: novel spectral properties and laser performance from a controlled local structure

Laser emission of a Nd-doped mixed tellurite and zinc oxide glass

Synthesis and Characterization of Nd<SUP>3+</SUP>-Doped CaF<SUB>2</SUB> Nanoparticles

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Nd,Y:CaF₂laser crystals: novel spectral properties and laser performance from a controlled local structure

Nd,Y:CaF₂laser crystals: novel spectral properties and laser performance from a controlled local structure