Selective laser excitation and inhomogeneous band broadening of Nd3+ ions in disordered CaF2-YF3 crystals

Basiev, Tasoltan T.; Karasik, Aleksandr Ya; Shubochkin, Roman

doi:10.1016/0022-2313(95)00040-w

Cited by 20 publications

(17 citation statements)

References 4 publications

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“…24 However, the addition of Y 3+ brings changes in the structure as the original Nd 3+ or Ca 2+ site would be substituted with Y 3+ , thus new mixed aggregation sites, labeled as M′ and N′, as in ref. 25, may occur. However, the images in Fig.…”

Section: Spectroscopic Properties Of Ndy:caf 2 Crystalsmentioning

confidence: 99%

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: Spectroscopic Properties Of Ndy:caf 2 Crystalsmentioning

confidence: 99%

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

et al. 2015

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“…[10][11][12][13] These centres have also been observed in other fluorite-type crystals, such as Nd 3+ :SrF 2 . 14 The investigation of Y 3+ codoping by Basiev et al 15 shows that the three main types of Nd 3+ -Y 3+ clusters are subsets of the M, N and L geometries, that is to say, quasi-tetragonal sites named L* and quasi-rhombic sites labelled M′ and N′. These geometries are in fact modified by the presence of the codopants in the vicinity of the emitting neodymium ions.…”

Section: Introductionmentioning

confidence: 99%

“…11,13 Thus, in room-temperature spectroscopic investigations, these two centres are considered as a single type of centre, as in Basiev's work. 15,16 To the best of our knowledge, there is a lack of detailed spectroscopic studies identifying the separate spectroscopic features of each centre. In this work, we present the distinct absorption and emission spectra, fluorescence and radiative lifetimes as well as the respective concentrations of the two main emitting centres in CaF 2 :Nd 3+ ,Lu 3+ .…”

Section: Introductionmentioning

confidence: 99%

Site selective analysis of Nd³⁺–Lu³⁺codoped CaF₂laser crystals

et al. 2016

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Within neodymium-doped laser crystals, the codoping of fluorite-type single crystals with non-optically active buffer ions reveals the possibility for broadband laser operation around 1 μm, which makes these materials appealing for a number of applications such as amplifiers for new generation laser fusion facilities. In this work, a detailed spectroscopic investigation of CaF 2 :Nd 3+ single crystals co-doped with various concentrations of Lu 3+ ions is presented. The results show that the Nd 3+ emission quantum efficiency increases drastically with the Lu 3+ concentration, as a consequence of the replacement of Nd 3+ -Nd 3+ clusters by two predominant types of Nd 3+ -Lu 3+ clusters. These two main Nd 3+ emitting centres are characterized in detail by identifying, for the first time to the best of our knowledge, their individual absorption and emission cross-section spectra, along with their fluorescence and radiative lifetimes and respective concentrations. The identification of the two predominant Nd 3+ -Lu 3+ clusters (labelled NL1 and NL2) is carried out at room temperature by carefully choosing the Lu 3+ concentration, the time windows used in time-resolved spectroscopy and the excitation or emission wavelength. The determination of the different centre concentrations and respective absorption cross-sections is achieved by comparing selective timeresolved excitation spectra and absorption spectra encompassing contributions from Nd-Nd clusters and the two types of Nd 3+ -Lu 3+ clusters. As the Lu 3+ concentration increases, the NL2 centres become predominant and are characterized by an emission peak at 1054 nm and a stronger emission cross-section than that of their NL1 counterparts. Finally, the absorption cross-sections, concentrations and lifetimes are successfully used to calculate the contributions of NL1 and NL2 in the various emission spectra regardless of the Lu 3+ concentration or excitation wavelength confirming the consistency of the spectroscopic description.

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“…Cubic crystals of yttrofluorite (CaF2-YF3-NdF3) of space group Fm3m belong to this kind of multicenter system. The crystals are characterized by broad absorption and emission bands, which can not be resolved into indiviual components, even at helium temperature, because of the existence of a large amount of optical centers of different structures [2]. Although the precise nature and distribution of these centers, which depend on the yttrium and neodymium content, are not yet well known, for total concentrations of YF3 and NdF3 of approximately 4% or greater only two main site distributions remain.…”

Section: Introductionmentioning

confidence: 98%

“…This behavior is related to the variety of optical centers that are present in these mixed systems, which also influences the stimulated-emission process [1,2]. Cubic crystals of yttrofluorite (CaF2-YF3-NdF3) of space group Fm3m belong to this kind of multicenter system.…”

Section: Introductionmentioning

confidence: 99%

Laser action and infrared-to-visible upconversion processes of Nd³⁺in yttrofluorite crystals

Iparraguirre¹,

Azkargorta²,

Balda³

et al. 2003

SPIE Proceedings

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In this work, together with the laser dynamics and for the first time, the study of upconversion processes that produce violet and visible emissions in yttrofluorite mixed crystals with 15 wt% of YF3 and 1, 4, 8, and 16 wt% of NdF3 is presented. Site-selective excitation of Nd-doped yttrofluorite crystals by using spectrally narrow pump pulses have shown that it is possible to lase these materials in a single line at 1054 nm or at 1063 nm independently, or simultaneously in both lines depending on the Nd3 concentration and the excitation wavelength. The upconversion measurements were conducted in such a way that the dynamics of the violet and visible fluorescence was performed under lasing and nonlasing conditions. The dynamics of the upconverted emission shows that both energy transfer upconversion and excited state absorption ofthe laser emission occur.

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Selective laser excitation and inhomogeneous band broadening of Nd3+ ions in disordered CaF2-YF3 crystals

Cited by 20 publications

References 4 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

Site selective analysis of Nd³⁺–Lu³⁺codoped CaF₂laser crystals

Laser action and infrared-to-visible upconversion processes of Nd³⁺in yttrofluorite crystals

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Selective laser excitation and inhomogeneous band broadening of Nd3+ ions in disordered CaF2-YF3 crystals

Cited by 20 publications

References 4 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

Site selective analysis of Nd3+–Lu3+codoped CaF2laser crystals

Laser action and infrared-to-visible upconversion processes of Nd3+in yttrofluorite crystals

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Product

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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

Site selective analysis of Nd³⁺–Lu³⁺codoped CaF₂laser crystals

Laser action and infrared-to-visible upconversion processes of Nd³⁺in yttrofluorite crystals