Fascination About KGW Crystal
Fascination About KGW Crystal
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While ytterbium-doped laser acquire media typically exhibit a little quantum defect, ytterbium-doped tungstates make it possible for for specially smaller values. As an example, a 1030-nm Yb:YAG laser would Typically be pumped all-around 940 nm, While Yb:KGW or Yb:KYW could possibly be most proficiently pumped all over 981 nm.
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The purple-shifted Component of the SC is of realistic great importance, specifically for what issues the functionality of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The dearth of seed photons from the lengthy-wavelength region of the SC spectrum restrictions the amplification efficiency and leads to pulse-to-pulse Power fluctuations across the degeneracy region of your optical parametric amplifier. This part is quantified in Fig. 6a by plotting the SC spectra with regard to spectral Strength density, which was estimated by measuring the Electricity with the axial Component of SC radiation (which can be the only real pretty much helpful part of SC emission). KGW crystal creates the best spectral Strength density within the 1200�?450 nm vary, as famous inside of a latest study30.
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]. Etalon insertion would cause added decline, even so, time-to-time optimization would introduce the risk of component destruction and instability towards the process. A nonlinear regenerative amplifier could specifically produce pulses having a duration as little as 97 fs as well as a spectral bandwidth of 19 nm[
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Comparison of spectral Strength densities of supercontinua made from the circumstances of optimal pumping within the investigated supplies.
Thermal consequences are considerably more compact in KGW. This combined with the superior damage threshold make the crystal an excellent prospect for power scaling. Comparing Ba(NO3)2 and KGW for Raman application Ba(NO3)2 are simpler in the event of ns pulses and KGW �?in the event of ps pulses.
The edge Strength for SC generation (hbox E _ textrm th ) was outlined given that the pump pulse Vitality, in which the blue-shifted spectral broadening swiftly settles to a certain Minimize-off wavelength that remains Virtually regular even with more maximize of the pump pulse Strength. The ideal Vitality (hbox E _textrm choose ), was outlined as the pump pulse Vitality, which makes the largest 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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The Yb:KGW laser procedure contains a quasi-a few-level conduct. The online achieve of your Yb:KGW crystal was not significant: many tens of roundtrips were needed to amplify the nanojoule seed to your millijoule degree. So, the obtain-narrowing result was inescapable in Yb:KGW regenerative amplifiers.
Figure four Beam radius variation on the two crystals though switching the focal length with the thermal lensing result.
The origin of the component's name comes from the English term 'potash,' which means pot ashes, and also the Arabic term qali