Upconversion rate in Nd-doped Ta2O5 waveguides and influence on the cw laser performance

Lahoz, F.; Hassan, Majid

doi:10.1016/j.cplett.2006.05.061

Cited by 6 publications

(4 citation statements)

References 13 publications

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“…55 Nd 3+ -doped Ta 2 O 5 has been described for laser applications. [56][57][58] Indeed, high-quality upconversion emission from Nd 3+ -doped Ta 2 O 5 rib planar waveguides deposited onto the silica substrate has been detected in the blue, green, orange, and red spectral regions. 59 Considering the binary system SiO 2 -Ta 2 O 5 , an intense multicolor visible light emission has been observed for Tm 3+ -Ho 3+ -Yb 3+ co-doped Ta 2 O 5 nanocrystals in the case of a silica-based nanocomposite synthesized by the sol-gel method.…”

Section: Introductionmentioning

confidence: 96%

Color tunability of intense upconversion emission from Er3+–Yb3+ co-doped SiO2–Ta2O5 glass ceramic planar waveguides

et al. 2012

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This work reports on the infrared-to-visible CW frequency upconversion from planar waveguides based on Er 3+ -Yb 3+ -doped 100-xSiO 2 -xTa 2 O 5 obtained by a sol-gel process and deposited onto a SiO 2 -Si substrate by dip-coating. Surface morphology and optical parameters of the planar waveguides were analyzed by atomic force microscopy and the m-line technique. The influence of the composition on the electronic properties of the glass-ceramic films was followed by the band gap ranging from 4.35 to 4.51 eV upon modification of the Ta 2 O 5 content. Intense green and red emissions were detected from the upconversion process for all the samples after excitation at 980 nm. The relative intensities of the emission bands around 550 nm and 665 nm, assigned to the 2 H 11/2 / 4 I 15/2 , 4 S 3/2 / 4 I 15/2 , and 4 F 9/2 / 4 I 15/2 transitions, depended on the tantalum oxide content and the power of the laser source at 980 nm. The upconversion dynamics were investigated as a function of the Ta 2 O 5 content and the number of photons involved in each emission process. Based on the upconversion emission spectra and 1931CIE chromaticity diagram, it is shown that color can be tailored by composition and pump power. The glass ceramic films are attractive materials for application in upconversion lasers and near infrared-to-visible upconverters in solar cells.

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Section: Introductionmentioning

confidence: 96%

Color tunability of intense upconversion emission from Er3+–Yb3+ co-doped SiO2–Ta2O5 glass ceramic planar waveguides

et al. 2012

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“…For instance, power scaling as high as ϳ2.0 kW has been found in Nd:YAG ceramics [1]. However, in such a high-power regime, some detrimental mechanisms, e.g., energy transfer upconversion (ETU), also known as Auger upconversion, may become very important factors that, in principle, change the system parameters required for optimum performance [2][3][4][5]. The ETU process has two main consequences: a decrease of the excited-state population and, at the same time, an increase in the thermal loading of the material [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Energy transfer upconversion determination by thermal-lens and Z-scan techniques in Nd^3+-doped laser materials

et al. 2009

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The Z-scan and thermal-lens techniques have been used to obtain the energy transfer upconversion parameter in Nd 3+ -doped materials. A comparison between these methods is done, showing that they are independent and provide similar results. Moreover, the advantages and applicability of each one are also discussed. The results point to these approaches as valuable alternative methods because of their sensitivity, which allows measurements to be performed in a pump-power regime without causing damage to the investigated material.

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“…Lifetime measurements of the excited state showed a dependence on the pump power, thus indicating the existence of Auger up-conversion. Upconversion effects in the Nd:Ta 2 O 5 rib waveguides and their influence on the laser performance was the subject of a later study [75,76], where it was suggested that an energy transfer up-conversion (ETU) process between closely positioned Nd 3+ ions was responsible for the reduced lifetime of the upper laser level. The induced increase of the pump power threshold was theoretically predicted to be proportional to the ETU rate, which was confirmed by the threshold observed experimentally for different output coupling mirrors.…”

Section: Neodymium Doped Tantalum Pentoxide Waveguide Lasermentioning

confidence: 99%

Dielectric binary oxide films as waveguide laser media: a review

Grivas

Eason

2008

J. Phys.: Condens. Matter

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Sapphire (α-Al(2)O(3)), amorphous and polycrystalline Al(2)O(3), tantalum pentoxide Ta(2)O(5) and the sesquioxides Y(2)O(3), Sc(2)O(3), and Lu(2)O(3) are excellent laser hosts due to their very good thermomechanical properties, broad transparency range and ease of doping with active ions. This article reviews recent research towards the realization of active optical films and the demonstration of gain and laser operation in the waveguides produced from these materials. Compound structures in which laser operation has been demonstrated are highlighted together with the applied fabrication techniques, and details of the laser performance are presented.

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Upconversion rate in Nd-doped Ta2O5 waveguides and influence on the cw laser performance

Cited by 6 publications

References 13 publications

Color tunability of intense upconversion emission from Er3+–Yb3+ co-doped SiO2–Ta2O5 glass ceramic planar waveguides

Color tunability of intense upconversion emission from Er3+–Yb3+ co-doped SiO2–Ta2O5 glass ceramic planar waveguides

Energy transfer upconversion determination by thermal-lens and Z-scan techniques in Nd^3+-doped laser materials

Dielectric binary oxide films as waveguide laser media: a review

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