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For high-power lasers the requirements on the thermo-mechanical properties of the host material increase, demanding for a high heat transfer coefficient and good mechanical strength of the host medium. Compared to the well established YAG crystal, the Lu2O3 crystal has a better heat transfer coefficient and a good mechanical strength, making this host interesting for high-power laser application....
This work demonstrates spatial-resolved X-ray diffraction at the synchrotron. The YAG single crystal is scanned across the femtosecond-laser written waveguide with an X-ray spot size of about 5 mum. Diffraction data is therefore recorded at areas with and without waveguide structures. A detailed analysis of X-ray diffraction measurements is presented and discussed in the paper.
Sesquioxides offer excellent thermal-mechanical properties. They have a high intrinsic thermal conductivity and good mechanical stability. Furthermore doping with rare earth ions in high concentration is possible because of the similar atomic radii. Especially ytterbium is an interesting active ion due to its very simple energy-level-scheme with only two multiplets. Therefore, no excited state absorption...
Transient Yb2+ states the role of permanent Yb2+ states is discussed. Investigations on Yb:YAG single crystals grown in reducing atmosphere reveal that the magnitude of photocurrent is reduced by annealing the sample. This result points towards an involvement of permanent Yb2+ states in the photoconductivity mechanism. To further examine the influence of Yb2+-ions, samples with Si4+ co-doping are...
The energy transfer from Yb3+ to Er3+ in crystalline Sc2O3 is studied using continuous wave (cw)-excitation method and Yb3+ ions excitation in the sample by pulsed optical parametrical oscillators. Crystalline Sc2O3 films with different Er3+ and Yb3+ concentrations are grown on alpha-Al2O3 substrates by pulsed laser deposition. Laser-experiments with codoped Er3+(0.23%),Yb3+(0.4%):Sc2O3 and Er3+(0...
The authors report on the spectroscopy and laser results of diode pumped Pr-doped fluorides. We obtained efficient laser emission in the visible range with LiYF4, LiLuF4 and LiGdF4 crystals.
We present an efficient in-band-pumped Er(0.2 at.%):Sc2O3-laser at 1581 nm with a maximum output power of 0.95 W and a maximum slope efficiency of 31%.
A comparative study of highly-efficient laser operation of high-purity Yb:Lu2O3 and Yb:Sc2O3 is reported. In thin-disk laser geometry an output-power of 36.3 W at 1034 nm with a slope-efficiency of 80% was obtained from a 5at.%-doped Lu2O3-disk.
In this work we report simultaneous emission on the 0.9-mum 4F3/2 → 4I9/2 and the 1.06-μm 4F3/2 → 4I11/2 transitions in Nd-based laser materials employing the thin-disk geometry in a multi-pass pump scheme, as well as a new design of the optical resonator.
Rare-earth doped garnets have been widely used in solid-state lasers. Thus, we report on lattice-matched film growth of these materials by the pulsed laser deposition technique. Eu-doped Y3Al5O12 (YAG) films grown on sapphire is investigated. In order to obtain additional information, structural characterization by means of X-ray diffraction and atomic force microscopy has been performed. Also, the...
In this work we investigate visible transitions of Pr in the crystal Pr:LiLuF4. In particular we will report on the growth, emission and absorption spectroscopy as well as laser action at four different wavelengths. Findlay-Clay and Caird analysis have been carried out in order to characterise the cavity and the crystal quality. To the best of our knowledge the reported slope efficiencies are the...
Summary form only given. In this work we present an important step with respect to the high power laser performance of thin disk lasers using high quality Yb:Lu2O3 crystals from improved crystal growth by the heat exchanger method (HEM).
This paper reports on a Er:Sc2O3 laser emitting a CW output power of 16.1 mW at 1583.7 nm for 890 mW of absorbed pump power, and with slope efficiency 4.2%. The Er:Sc2O3 of 4.75 mm length was grown by the Nacken-Kyropoulos method. Ti:Al2O3 laser emitting at 975 nm was used as the pump source.
The photoconductivity of high Yb-concentration YAG and Y2O3 samples has been measured, confirming the occurrence of up-conversion in these materials. High intensity pumping reveals a very broad emission spectrum that exhibits avalanche behaviour.
We demonstrate output powers exceeding 4 W with continuous-wave, diode-pumped Yb:TVO4 (T=Y, Gd, and Lu) lasers operated at room temperature. The three orthovanadate hosts are compared in longitudinal and thin-disk pump geometries.
Room temperature laser operation near 1030 nm of Yb3+ in the disordered crystal NaGd(WO4)2 with slope efficiencies exceeding 30%, output powers more than 300 mW, and tuning from 1016 to 1049 nm are demonstrated
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