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 distinction-Improved MRI and pathology in orthotopic human GBM xenografts.
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We utilized a transmission grating (TG) like a dispersive component within our stretcher and compressor. A compact configuration was adopted, the place the stretcher and the compressor shared one particular grating much like that in Ref.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are productive nonlinear products for broadband SC era in the near-infrared and brief-wave infrared spectral ranges, when pumped by a hundred and eighty fs essential harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which compare to SC spectra made in YAG. These materials show very comparable performances to YAG also concerning threshold and exceptional pump pulse energies for SC generation. Having said that, for what problems the likelihood to operate at high laser pulse repetition fee, YSO, LSO and LYSO exhibit strong Procedure only at ten kHz and rapidly degrade (inside of a few minutes) at 20 kHz. Aside from the fairly lower SC era threshold (169 nJ), GGG shown wonderful performance characteristics within the short-wave infrared While using the best pump pulse Power of 464 nJ, which can be two times reduce than in YAG: the largest pink-shifted spectral broadening and the very best spectral Electrical power density, outperforming KGW and YAG crystals in that aspect.
In contrast, the seed laser is usually amplified to in excess of one mJ beneath the orthogonal orientation configuration.
In advance of the development of Nd:YAG, Nd3+:CaWO4 was a vital uncommon-earth-doped laser get medium. It absolutely was the truth is Employed in the initial continuously functioning crystal laser.
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The black line denotes the configuration with the crystals placed in exactly the same orientation, whilst the red line is underneath the configuration of crystals positioned in orthogonal orientation.
We prepare to spice up the heart beat energy to over 40 mJ in two-stage multi-move amplifiers, comparable to a attain element of twenty. In Just about every amplifier, we will even undertake two cascaded crystals positioned underneath orthogonal orientation to decrease the thermal load on Every single crystal and compensate to the obtain-narrowing impact.
The threshold Strength for SC technology (hbox E _ textrm th ) was defined as being the pump pulse energy, in which the blue-shifted spectral broadening promptly settles to a certain Lower-off wavelength That is still almost continual In spite of further more improve on the pump pulse Electricity. The the best possible Power (hbox E _textrm choose ), was outlined as being the pump pulse Power, which generates the biggest red-shifted spectral broadening prior to the onset of periodic modulation in the SC spectrum as a result of filament refocusing.
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Assembling tungsten oxide hydrate nanocrystal colloids formed by laser ablation in liquid into quickly-response electrochromic movies.