Fascination About KGW Crystal
Fascination About KGW Crystal
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Previous do the job confirmed that the dual-crystal configuration can be used to compensate for your thermal lensing effect[
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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 technology from the around-infrared and limited-wave infrared spectral ranges, when pumped by one hundred eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Examine to SC spectra made in YAG. These materials show rather very similar performances to YAG also regarding threshold and optimum pump pulse energies for SC technology. Nonetheless, for what worries the chance to function at higher laser pulse repetition level, YSO, LSO and LYSO demonstrate tough Procedure only at 10 kHz and speedily degrade (within a couple of minutes) at twenty kHz. Besides the comparatively small SC generation threshold (169 nJ), GGG demonstrated wonderful performance attributes in the limited-wave infrared While using the optimum pump pulse Vitality of 464 nJ, that's two periods reduce than in YAG: the biggest crimson-shifted spectral broadening and the highest spectral Vitality density, outperforming KGW and YAG crystals in that factor.
-switched mode. The bandwidth inside the orthogonal orientation was Plainly much broader. The calculated Fourier change confined pulse period was as shorter as sub-a hundred and sixty fs. Beneath the configuration wherever The 2 crystals ended up positioned in precisely the same orientation, Together with the seed input, the here amplified pulse bandwidth was only 3 nm with 180 μJ Power when it broke the dichroic mirrors.
Amplified pulses using an Strength earlier mentioned two.five mJ might be envisioned by implementing the next pump electricity on the regenerative amplifier and which makes it perform in the saturation level. The laser fluence of ~one J/cm2 within the dichroic mirrors is considered to be under the problems threshold of higher-high quality dielectric-coated mirrors.
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The put together obtain is complex and may be measured underneath different pumping ailments because of the quasi-3-amount method behavior on the Yb-doped attain medium. The blueshift, with a single peak from 1037 nm beneath the similar crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could outcome through the reabsorption losses at a protracted wavelength in the crystal where by the laser polarization is parallel to its Nm -axis, creating the acquire at 1035 nm higher than that at 1037 nm less than orthogonal orientation.
Hence, with an extra advancement within our regenerative amplifier, 2 mJ compressed pulses can be envisioned, without damaging any part inside of our compressor.
The purple-shifted Element of the SC spectrum in BGO has the bottom spectral Power density, which is one–two orders of magnitude decreased than in the remainder of the resources. On the other hand, incredibly reduced Power threshold of SC generation, in addition to low exceptional pump Strength in BGO, must be pointed out. The believed spectral Vitality densities developed in LSO and LYSO are very similar to YAG through the important Portion of the SC spectrum. Essentially the most interesting obtaining in that regard is GGG crystal, which, despite quite average blue-shifted spectral broadening, produces the biggest spectral purple-change and the very best spectral Power density while in the 1600�?000 nm vary, which is almost an purchase of magnitude increased than that generated in YAG.
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Tungstates are likely to own large Raman coefficients (�?Raman scattering). Therefore, they will create significant Raman get at moderate optical intensities. It is achievable to utilize the laser crystal by itself for a Raman converter.
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