Little Known Facts About KGW Crystal.
Little Known Facts About KGW Crystal.
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In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear supplies for broadband SC generation in the around-infrared and brief-wave infrared spectral ranges, when pumped by 180 fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Assess to SC spectra generated in YAG. These supplies exhibit really comparable performances to YAG also when it comes to threshold and optimum pump pulse energies for SC generation. Nevertheless, for what fears the chance to work at higher laser pulse repetition price, YSO, LSO and LYSO clearly show long lasting Procedure only at 10 kHz and quickly degrade (inside a few minutes) at 20 kHz. Besides the comparatively very low SC era threshold (169 nJ), GGG demonstrated wonderful efficiency characteristics during the small-wave infrared Together with the best pump pulse Strength of 464 nJ, that's two occasions lessen than in YAG: the most important purple-shifted spectral broadening and the very best spectral Electricity density, outperforming KGW and YAG crystals in that facet.
-switched method. The bandwidth while in the orthogonal orientation was Obviously Significantly broader. The calculated Fourier remodel constrained pulse length was as shorter as sub-160 fs. Underneath the configuration where The 2 crystals have been positioned in the exact same orientation, Along with the seed enter, the amplified pulse bandwidth was only three nm with one hundred eighty μJ Electrical power when it broke the dichroic mirrors.
Amplified pulses by having an Strength previously mentioned 2.five mJ can be anticipated by applying a better pump electric power to your regenerative amplifier and rendering it perform at the saturation amount. The laser fluence of ~one J/cm2 around the dichroic mirrors is considered to get underneath the damage threshold of higher-high-quality dielectric-coated mirrors.
Several techniques are already adopted to unravel this issue. An acousto-optical programmable dispersive filter is often utilized to modulate the seed’s spectrum to suppress the acquire-narrowing impact[
The mixed get is sophisticated and may be calculated below unique pumping problems due to quasi-three-degree procedure actions with the Yb-doped gain medium. The blueshift, with just one peak from 1037 nm under the exact crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could outcome from your reabsorption losses at a lengthy wavelength during the crystal the place the laser polarization is parallel to its Nm -axis, earning the gain at 1035 nm greater than that at 1037 nm beneath orthogonal orientation.
Consequently, with a further improvement within our regenerative amplifier, two mJ compressed pulses could be predicted, without having damaging any ingredient inside of our compressor.
The edge Vitality for SC technology (hbox E _ textrm th ) was described because the pump pulse Electricity, the place the blue-shifted spectral broadening swiftly settles to a particular cut-off wavelength That is still Practically continual Despite having further maximize from the pump pulse energy. The the best possible Electrical power (hbox E _textrm choose ), was described as the pump pulse Vitality, which creates the largest red-shifted spectral broadening ahead of the onset of periodic modulation from the SC spectrum as a result of filament refocusing.
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-switched laser output beneath the two crystal placement configurations. The KGW Crystal black line denotes the configuration with the crystals positioned in the identical orientation, while the purple line is under the configuration of crystals positioned in orthogonal orientation.
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