The best Side of KGW Crystal
The best Side of KGW Crystal
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Earlier work confirmed that the dual-crystal configuration may be used to compensate to the thermal lensing effect[
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The acquire bandwidth e.g. of Yb:KGW and Yb:KYW is very big in contrast with that of Yb:YAG. This enables for vast wavelength tunability and for Substantially shorter pulse durations from mode-locked lasers. Values very well beneath 100 fs have already been achieved with passive manner locking.
The pink-shifted Portion of the SC is of sensible great importance, specifically for what considerations the efficiency of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The lack of seed photons from the extended-wavelength area on the SC spectrum limitations the amplification efficiency and brings about pulse-to-pulse Electricity fluctuations around the degeneracy area in the optical parametric amplifier. This facet is quantified in Fig. 6a by plotting the SC spectra when it comes to spectral Electrical power density, which was approximated by measuring the energy from the axial Portion of SC radiation (that is the sole pretty much helpful Element of SC emission). KGW crystal provides the best spectral Electricity density during the 1200�?450 nm array, as observed inside of a modern study30.
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Amplified pulses with the Electrical power over two.5 mJ can be envisioned by implementing a higher pump electric power to click here the regenerative amplifier and rendering it perform at the saturation amount. The laser fluence of ~one J/cm2 within the dichroic mirrors is believed for being beneath the problems threshold of superior-high-quality dielectric-coated mirrors.
One other was put with its Np -axis parallel Using the s-polarized route. A comparison was manufactured involving a configuration With all the crystals positioned in the same orientation (
The black line denotes the configuration Using the crystals put in exactly the same orientation, when the purple line is underneath the configuration of crystals put in orthogonal orientation.
Thermal outcomes are appreciably more compact in KGW. This combined with the high injury threshold make the crystal a fantastic prospect for power scaling. Evaluating Ba(NO3)2 and KGW for Raman application Ba(NO3)2 are simpler in the event of ns pulses and KGW �?in case of ps pulses.
The threshold Electrical power for SC era (hbox E _ textrm th ) was described as the pump pulse Vitality, where by the blue-shifted spectral broadening swiftly settles to a particular Slash-off wavelength that remains Practically frequent even with more raise of the pump pulse Vitality. The ideal Electricity (hbox E _textrm decide ), was defined because the pump pulse Vitality, which creates the biggest crimson-shifted spectral broadening prior to the onset of periodic modulation from the SC spectrum due to filament refocusing.
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The Yb:KGW laser method provides a quasi-a few-level conduct. The online gain in the Yb:KGW crystal wasn't high: several tens of roundtrips had been required to amplify the nanojoule seed to the millijoule degree. So, the attain-narrowing influence was unavoidable in Yb:KGW regenerative amplifiers.
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Assembling tungsten oxide hydrate nanocrystal colloids fashioned by laser ablation in liquid into quick-response electrochromic movies.