5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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Past do the job showed that the twin-crystal configuration can be used to compensate for that thermal lensing influence[
Although ytterbium-doped laser obtain media frequently exhibit a little quantum defect, ytterbium-doped tungstates permit for notably small values. Such as, a 1030-nm Yb:YAG laser would normally be pumped about 940 nm, While Yb:KGW or Yb:KYW could be most efficiently pumped all around 981 nm.
The gain bandwidth e.g. of Yb:KGW and Yb:KYW is very large in contrast with that of Yb:YAG. This enables for vast wavelength tunability and for Substantially shorter pulse durations from mode-locked lasers. Values well beneath one hundred fs happen to be achieved with passive method locking.
The purple-shifted Portion of the SC is of useful importance, specifically for what issues the performance of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The lack of seed photons while in the lengthy-wavelength region with the SC spectrum boundaries the amplification efficiency and leads to pulse-to-pulse Strength fluctuations around the degeneracy location of the optical parametric amplifier. This component is quantified in Fig. 6a by plotting the SC spectra with regard to spectral Strength density, which was estimated by measuring the Electrical power with the axial Portion of SC radiation (that is the one nearly practical Section of SC emission). KGW crystal generates the highest spectral Vitality density while in the 1200�?450 nm selection, as mentioned inside a latest study30.
The monoclinic crystal constructions results in a organic birefringence, helping to keep away from thermally induced polarization rotation and depolarization reduction.
The comparison with Eyeglasses is appropriate Because the huge obtain bandwidth enables e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
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We approach to spice up the pulse Electricity to above 40 mJ in two-phase multi-go amplifiers, corresponding to a attain factor of 20. In Each and every amplifier, we can even adopt two cascaded crystals positioned underneath orthogonal orientation to reduce the thermal load on Just about every crystal and compensate to the achieve-narrowing influence.
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-switched laser output underneath the two crystal placement configurations. The black line denotes the configuration With all the crystals placed in the exact same orientation, even though the crimson line is under the configuration of crystals positioned in orthogonal orientation.
Determine 8 Intra-cavity pulse amplification course of action monitored by an oscilloscope. The pulse underwent an unsaturated amplification because of the mirror injury limitation.
]. The dual-crystal configuration lowers the thermal load on Each individual crystal though protecting a significant gain, and facilitates the compensation of every one’s thermal lensing impact. Consequently, the laser cavity can perform read more with a sizable steadiness range over the thermal lensing effect variation.