KGW Crystal - An Overview
KGW Crystal - An Overview
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Investigating tumor perfusion by hyperpolarized (13) C MRI with comparison to conventional gadolinium contrast-Improved 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 efficient nonlinear supplies for broadband SC era from the in the vicinity of-infrared and short-wave infrared spectral ranges, when pumped by one hundred eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Assess to SC spectra produced in YAG. These materials exhibit fairly equivalent performances to YAG also with regard to threshold and optimal pump pulse energies for SC technology. Having said that, for what concerns the chance to function at high laser pulse repetition amount, YSO, LSO and LYSO exhibit resilient operation only at ten kHz and swiftly degrade (in just a few minutes) at twenty kHz. In addition to the rather reduced SC era threshold (169 nJ), GGG shown wonderful effectiveness features within the short-wave infrared Together with the best pump pulse Electricity of 464 nJ, which is two moments lessen than in YAG: the most important pink-shifted spectral broadening and the best spectral Vitality density, outperforming KGW and YAG crystals in that factor.
Substitute from the Computer system for an even better 1 or simply a fantastic adjustment with the Personal computer orientation and also the utilized significant voltage is needed to keep away from this phenomenon. A quick pulse picker can be employed to Enhance the nanosecond-scale contrast of your output primary pulse.
Amplified pulses using an Electricity higher than two.five mJ is often predicted by making use of a better pump electricity into the regenerative amplifier and rendering it do the job at the saturation degree. The laser fluence of ~1 J/cm2 over the dichroic mirrors is considered for being below the damage threshold of superior-good quality dielectric-coated mirrors.
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The spectral measurements of filament-induced luminescence propose that scintillating Attributes of products may be readily analyzed employing femtosecond near-infrared mild source through multiphoton excitation in the filamentation regime, which lets easy separation of excitation and emission wavelengths and minimal chance of optical damage.
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While BGO, GGG, YSO, LSO and LYSO from time to time function laser hosts37, They may be generally recognized as efficient scintillators, whose scintillation Houses are studied pretty well38. Nevertheless, the nonlinear optical Homes of those crystals and so their probable to serve as nonlinear elements for SC era particularly, and some other experiments about nonlinear propagation of rigorous femtosecond laser pulses, continue being really improperly analyzed. To date, GGG, LT23,twenty five and YSO24 were being only sketchily examined for SC generation with Ti:sapphire laser pumping, nevertheless, to the most beneficial of our know-how, Not one of the investigated supplies were being examined with Yb-laser pumping, especially for what problems their efficiency at extremely superior (tens to numerous kHz) pulse repetition premiums.
The Yb:KGW laser procedure includes a quasi-3-amount conduct. The online acquire on the Yb:KGW crystal wasn't superior: a number of tens of roundtrips had been necessary to amplify the nanojoule seed into a millijoule stage. So, the attain-narrowing influence was inevitable in Yb:KGW regenerative amplifiers.
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