The 2-Minute Rule for KGW Crystal
The 2-Minute Rule for KGW Crystal
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We utilized a transmission grating (TG) for a dispersive element in our stretcher and compressor. A compact configuration was adopted, where by the stretcher and the compressor shared a person grating similar to that in Ref.
In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear materials for broadband SC generation from the in the vicinity of-infrared and limited-wave infrared spectral ranges, when pumped by a hundred and eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO created two octave-spanning SC spectra, which compare to SC spectra generated in YAG. These products show pretty similar performances to YAG also with regard to threshold and exceptional pump pulse energies for SC era. On the other hand, for what fears the chance to function at higher laser pulse repetition fee, YSO, LSO and LYSO exhibit tough operation only at ten kHz and speedily degrade (inside of a couple of minutes) at twenty kHz. Moreover the rather low SC technology threshold (169 nJ), GGG shown wonderful functionality features within the quick-wave infrared With all the optimal pump pulse energy of 464 nJ, which happens to be two situations reduce than in YAG: the most important red-shifted spectral broadening and the best spectral Power density, outperforming KGW and YAG crystals in that aspect.
Alternative with the Laptop for a greater a single or simply a great adjustment of the Laptop orientation as well as utilized higher voltage is necessary to steer clear of this phenomenon. A fast pulse picker can be used to Enhance the nanosecond-scale distinction in the output most important pulse.
Amplified pulses using an Vitality above two.5 mJ is usually predicted by making use of a better pump power for the regenerative amplifier and making it operate on the saturation degree. The laser fluence of ~one J/cm2 over the dichroic mirrors is considered to generally be down below the injury threshold of high-excellent dielectric-coated mirrors.
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In its elemental form, gadolinium incorporates a silvery-white look. Gadolinium is often a scarce earth or lanthanide aspect that possesses exceptional Homes advantageous to specialised programs for instance semiconductor fabrication and nuclear reactor shielding. It can be used for both equally its substantial magnetic moment (seven.ninety fourμ B) and in phosphors and scintillator crystals. When complexed with EDTA ligands, it's made use of as an injectable distinction agent for MRIs. The component is named once the Finnish chemist and geologist Johan Gadolin.
]. This method was determined by The point that the spectral emission cross-section curves differ from each other when laser polarization is paralleled to the different optical axis of Yb-doped double tungstates[
The edge Power for SC technology (hbox E _ textrm th ) was outlined as being the pump pulse energy, where by the blue-shifted spectral broadening immediately settles to a certain Slice-off wavelength That is still Virtually regular In spite of further improve with the pump pulse Power. The optimum energy (hbox E _textrm opt ), was outlined as being the pump pulse Electrical power, which creates the biggest crimson-shifted spectral broadening before the onset of periodic modulation inside the SC spectrum resulting from filament refocusing.
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Determine 4 Beam radius variation on the two crystals although shifting the focal length of the thermal lensing effect.
The two energies are marked because of the dashed strains as well as their values are labeled from the plots. The similar attributes had been also noticed in KGW and YAG crystals, whose spectral broadening dynamics are revealed for just a comparison in Fig. four.