Examine This Report on KGW Crystal
Examine This Report on KGW Crystal
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Investigating tumor perfusion by hyperpolarized (13) C MRI with comparison to standard gadolinium contrast-Improved MRI and pathology in orthotopic human GBM xenografts.
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In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear materials for broadband SC generation within the close to-infrared and quick-wave infrared spectral ranges, when pumped by 180 fs fundamental 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 resources exhibit quite comparable performances to YAG also with regards to threshold and best pump pulse energies for SC technology. On the other hand, for what issues the chance to operate at significant laser pulse repetition rate, YSO, LSO and LYSO exhibit strong Procedure only at 10 kHz and speedily degrade (in a few minutes) at twenty kHz. Other than the somewhat check here low SC technology threshold (169 nJ), GGG demonstrated outstanding general performance attributes during the short-wave infrared With all the optimum pump pulse energy of 464 nJ, which happens to be two times reduced than in YAG: the biggest pink-shifted spectral broadening and the highest spectral energy density, outperforming KGW and YAG crystals in that facet.
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Amplified pulses with the energy earlier mentioned 2.five mJ can be predicted by making use of a greater pump electricity to the regenerative amplifier and rendering it do the job at the saturation degree. The laser fluence of ~one J/cm2 over the dichroic mirrors is thought to become below the problems threshold of substantial-excellent dielectric-coated mirrors.
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The combined acquire is complicated and will be measured below different pumping situations because of the quasi-a few-degree system actions with the Yb-doped get medium. The blueshift, with a person peak from 1037 nm underneath the similar crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could result from your reabsorption losses at an extended wavelength within the crystal where by the laser polarization is parallel to its Nm -axis, generating the attain at 1035 nm increased than that at 1037 nm below orthogonal orientation.
Hence, with a further enhancement within our regenerative amplifier, 2 mJ compressed pulses is often expected, without having harming any part inside of our compressor.
We made a diode-pumped Yb:KGW regenerative amplifier as the front end of the kilohertz terawatt laser program. Wide bandwidth pulses were being acquired by implementing dual crystals with different orientations of their optical axes[
相关工作得到了上海扬帆计划、国家重点研发计划、中国科学院战略性先导科技专项、国家自然科学基金项目、上海市优秀学术/技术带头人计划、上海市市级科技重大专项、中国科学院青年创新促进会的支持。（强场激光物理国家重点实验室供稿）
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Prognostic influence of late gadolinium enhancement in the risk stratification of coronary heart transplant sufferers.
]. The dual-crystal configuration lowers the thermal load on Every single crystal even though retaining a significant achieve, and facilitates the compensation of each one’s thermal lensing outcome. As a result, the laser cavity can operate with a substantial security selection above the thermal lensing effect variation.