Facts About KGW Crystal Revealed
Facts About KGW Crystal Revealed
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Earlier work confirmed that the dual-crystal configuration can be utilized to compensate to the thermal lensing result[
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In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear products for broadband SC era in the close to-infrared and quick-wave infrared spectral ranges, when pumped by 180 fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Evaluate to SC spectra made in YAG. These products exhibit pretty comparable performances to YAG also regarding threshold and optimal pump pulse energies for SC generation. Even so, for what fears the likelihood to function at superior laser pulse repetition price, YSO, LSO and LYSO exhibit strong Procedure only at ten kHz and quickly degrade (inside a few minutes) at 20 kHz. Besides the comparatively lower SC era threshold (169 nJ), GGG demonstrated fantastic effectiveness properties in the shorter-wave infrared Along with the exceptional pump pulse Electricity of 464 nJ, which can be two occasions reduced than in YAG: the most important purple-shifted spectral broadening and the very best spectral Strength density, outperforming KGW and YAG crystals in that part.
Its pump laser needs a short pulse period, a very low time jitter, and easy temporal and spatial distributions because of the intrinsic instantaneous approach. Therefore, the OPCPA procedure is a lot more sophisticated and high-priced.
The comparison with glasses is appropriate Considering that the big gain bandwidth lets e.g. tungstate femtosecond lasers and tunable lasers to contend with glass lasers.
Nonetheless, when Nd3+:YAG grew to become commercially available, the interest in CaWO4 dropped sharply. In later years, particular other tungstate crystals began to appeal to lots of attention.
The black line denotes the configuration Together with the crystals positioned in the exact same orientation, though the red line is under the configuration of crystals put in orthogonal orientation.
Thus, with a further advancement within our regenerative amplifier, 2 mJ compressed pulses might be expected, with no harming any element inside of our compressor.
The threshold energy for SC generation (hbox E _ click here textrm th ) was described as being the pump pulse Electrical power, where by the blue-shifted spectral broadening quickly settles to a particular Slash-off wavelength That continues to be Pretty much continual In spite of additional boost from the pump pulse Vitality. The ideal Strength (hbox E _textrm decide ), was outlined because the pump pulse Electrical power, which produces the largest crimson-shifted spectral broadening before the onset of periodic modulation in the SC spectrum on account of filament refocusing.
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The Yb:KGW laser program has a quasi-a few-amount conduct. The net attain of the Yb:KGW crystal was not significant: various tens of roundtrips ended up needed to amplify the nanojoule seed to some millijoule stage. Thus, the gain-narrowing impact was inevitable in Yb:KGW regenerative amplifiers.
Figure four Beam radius variation on The 2 crystals whilst transforming the focal length of the thermal lensing influence.
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