KGW Crystal - An Overview
KGW Crystal - An Overview
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Whilst ytterbium-doped laser get media generally exhibit a little quantum defect, ytterbium-doped tungstates permit for significantly small values. For instance, a 1030-nm Yb:YAG laser would Ordinarily be pumped close to 940 nm, While Yb:KGW or Yb:KYW may be most effectively pumped around 981 nm.
The obtain bandwidth e.g. of Yb:KGW and Yb:KYW is very massive when compared with that of Yb:YAG. This permits for huge wavelength tunability and for Substantially shorter pulse durations from method-locked lasers. Values effectively under one hundred fs are already realized with passive method locking.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear products for broadband SC generation inside the in the vicinity of-infrared and quick-wave infrared spectral ranges, when pumped by 180 fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO generated two octave-spanning SC spectra, which Evaluate to SC spectra made in YAG. These elements show quite comparable performances to YAG also with regard to threshold and ideal pump pulse energies for SC generation. Nevertheless, for what issues the likelihood to function at significant laser pulse repetition amount, YSO, LSO and LYSO present durable operation only at 10 kHz and quickly degrade (inside a couple of minutes) at 20 kHz. Besides the fairly lower SC era threshold (169 nJ), GGG demonstrated superb performance qualities within the short-wave infrared With all the optimal pump pulse energy of 464 nJ, that is two occasions lower than in YAG: the biggest crimson-shifted spectral broadening and the best spectral Strength density, outperforming KGW and YAG crystals in that component.
The monoclinic crystal structures leads to a all-natural birefringence, assisting to steer clear of thermally induced polarization rotation and depolarization decline.
Before the event of Nd:YAG, Nd3+:CaWO4 was an important unusual-earth-doped laser get medium. It was in truth Employed in the main repeatedly operating crystal laser.
The other was placed with its Np -axis parallel with the s-polarized way. A comparison was designed in between a configuration with the crystals placed in the exact same orientation (
The merged achieve is intricate and will be measured less than distinctive pumping circumstances due to the quasi-three-amount method habits in the Yb-doped gain medium. The blueshift, with a single peak from 1037 nm beneath the very same crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could result within the reabsorption losses at a lengthy wavelength from the crystal the place the laser polarization is parallel to its Nm -axis, creating the gain at 1035 nm bigger than that at 1037 nm below orthogonal orientation.
Inquire RP Photonics for any suggestions relating to tungstate lasers, together with femtosecond lasers and substantial-electric power lasers.
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A multi-go major amplifier will additional Improve the Power to earlier mentioned forty mJ. We'll utilize cryogenically cooled Yb:KGW know-how to restrain the thermal effect. Two phases of compression are going to be employed right after amplification. The first stage will involve a common Treacy-form compressor, and will compress the pulse length to down below 300 fs using an performance of roughly 70%. The next stage consists of a fuel-loaded multi-pass cell[
Determine four Beam radius variation on The 2 crystals though altering the focal size on the thermal lensing influence.
Assembling tungsten oxide hydrate nanocrystal colloids formed by laser ablation in liquid into speedy-reaction electrochromic films.