Fascination About KGW Crystal
Fascination About KGW Crystal
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Investigating tumor perfusion by hyperpolarized (13) C MRI with comparison to traditional gadolinium distinction-enhanced MRI and pathology in orthotopic human GBM xenografts.
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In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear resources for broadband SC generation while in the near-infrared and small-wave infrared spectral ranges, when pumped by 180 fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO generated two octave-spanning SC spectra, which Evaluate to SC spectra developed in YAG. These elements show really very similar performances to YAG also in terms of threshold and ideal pump pulse energies for SC technology. However, for what issues the likelihood to work at high laser pulse repetition fee, YSO, LSO and LYSO demonstrate durable operation only at ten kHz and immediately degrade (within just a couple of minutes) at 20 kHz. Moreover the somewhat small SC technology threshold (169 nJ), GGG shown outstanding general performance characteristics in the limited-wave infrared Along with the exceptional pump pulse Electricity of 464 nJ, which can be two instances lessen than in YAG: the biggest pink-shifted spectral broadening and the highest spectral energy density, outperforming KGW and YAG crystals in that component.
-switched manner. The bandwidth during the orthogonal orientation was clearly much broader. The calculated Fourier transform confined pulse period was as small as sub-one hundred sixty fs. Beneath the configuration exactly where the two crystals were being positioned in the identical orientation, With all the seed enter, the amplified pulse bandwidth was only 3 nm with one hundred eighty μJ Electricity when it broke the dichroic mirrors.
The calculated Reduce-off wavelengths with the brief-wavelength side are in line with the final craze of blue-shifted spectral broadening within the bandgap of nonlinear material. Many of the nonlinear elements developed realistic red-shifted spectral broadenings beneath circumstances of best pump pulse energies, with the largest purple-shift exceeding 2000 nm calculated in GGG crystal. Our outcomes discovered that GGG and BGO (which also had the lowest supercontinuum era threshold) supply tough, optical problems-free functionality in a laser repetition fee of 200 kHz, suggesting that these elements are great possibilities to here YAG and KGW for minimal threshold, significant typical electric power supercontinuum technology within the around- and limited-wave infrared spectral ranges. We also shown that scintillating Attributes of bulk materials may be conveniently examined in the filamentation regime, by way of multiphoton excitation making use of in close proximity to-infrared femtosecond laser pulses.
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Comparison of spectral Electricity densities of supercontinua developed during the disorders of best pumping during the investigated components.
The spectral measurements of filament-induced luminescence propose that scintillating Homes of components could possibly be easily researched employing femtosecond around-infrared light resource by means of multiphoton excitation while in the filamentation regime, which allows uncomplicated separation of excitation and emission wavelengths and minimal risk of optical hurt.
The two-pump laser could present up to one hundred twenty W power. Close to 60% of the most pump power was utilized in our experiment considering the small efficiency of your dichroic mirrors. Beneath this dual-crystal configuration, our cavity supports a a hundred W pump electricity enter, as discussed in Section two.2. Substantial-high quality dichroic mirrors will be made use of Down the road, and laser pulses are going to be stretched to an extended pulse length.
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Determine 4 Beam radius variation on The 2 crystals when transforming the focal length from the thermal lensing result.
Equally energies are marked from the dashed traces as well as their values are labeled inside the plots. The identical capabilities were also observed in KGW and YAG crystals, whose spectral broadening dynamics are demonstrated for just a comparison in Fig. 4.