The KGW Crystal Diaries
The KGW Crystal Diaries
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Although ytterbium-doped laser attain media usually show a small quantum defect, ytterbium-doped tungstates allow for for specially little values. By way of example, a 1030-nm Yb:YAG laser would Typically be pumped close to 940 nm, whereas Yb:KGW or Yb:KYW might be most proficiently pumped about 981 nm.
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The pink-shifted Component of the SC is of sensible value, especially for what worries the effectiveness of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The shortage of seed photons in the very long-wavelength area of your SC spectrum limits the amplification performance and brings about pulse-to-pulse Vitality fluctuations throughout the degeneracy location of the optical parametric amplifier. This aspect is quantified in Fig. 6a by plotting the SC spectra with regard to spectral Strength density, which was estimated by measuring the energy on the axial Component of SC radiation (which happens to be the only pretty much helpful A part of SC emission). KGW crystal provides the highest spectral energy density while in the 1200�?450 nm assortment, as mentioned inside of a new study30.
The datasets applied and/or analysed through The existing research obtainable with the corresponding creator on sensible ask for.
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Having said that, when Nd3+:YAG turned commercially accessible, the interest in CaWO4 dropped sharply. In later on years, certain other tungstate crystals started to appeal to many notice.
The combined get is complex and should be measured below distinct pumping disorders as a result of quasi-three-stage system behavior with the Yb-doped attain medium. The blueshift, with one peak from 1037 nm under the similar crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could final result within the reabsorption losses at an extended wavelength during the crystal the place the laser polarization is parallel to its Nm -axis, producing the acquire at 1035 nm better than that at 1037 nm less than orthogonal orientation.
The actual spectra had been reconstructed by correcting the measured spectra having an account for that filter transmission capabilities and with the sensitivity features with the spectrometers at the data put up-processing phase. The spectral dynamics in Each and every sample was calculated by high-quality tuning the pump pulse Vitality with a pc-managed attenuator that was built-in within the laser technique. Thermal Vitality meter EM (Ophir 3A-PF-twelve) was accustomed to evaluate the SC Strength which was thereafter accustomed to estimate the spectral Vitality density in the SC radiation. Every one of the measurements ended up performed with no translation in the sample with regard towards the pump beam.
The red-shifted A part of the SC spectrum in BGO has the bottom spectral energy density, and that is one–two orders of magnitude lessen than in the rest of the products. However, really lower Power threshold of SC technology, along with minimal optimal pump Power in BGO, should be identified. The believed spectral Power densities manufactured in LSO and LYSO are quite much like YAG all over the significant Element of the SC spectrum. The most exciting getting in that regard is GGG crystal, which, Inspite of very average blue-shifted spectral broadening, makes the most important spectral pink-shift and the best spectral Strength density during the 1600�?000 nm assortment, which is nearly an order of magnitude greater than that produced in YAG.
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-switched laser output beneath the two crystal placement configurations. The black line denotes the configuration With all the crystals put in exactly the same orientation, whilst the pink line is beneath the configuration of crystals positioned in orthogonal orientation.
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Both energies are marked through the dashed traces and their values are labeled during the plots. The similar functions were being also noticed in KGW and YAG click here crystals, whose spectral broadening dynamics are revealed for a comparison in Fig. four.