An Unbiased View of KGW Crystal
An Unbiased View of KGW Crystal
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In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear resources for broadband SC technology inside the in close proximity to-infrared and quick-wave infrared spectral ranges, when pumped by a hundred and eighty fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO created two octave-spanning SC spectra, which Assess to SC spectra manufactured in YAG. These elements show fairly very similar performances to YAG also when it comes to threshold and ideal pump pulse energies for SC technology. However, for what worries the likelihood to operate at higher laser pulse repetition level, YSO, LSO and LYSO present durable Procedure only at ten kHz and rapidly degrade (inside of a few minutes) at twenty kHz. Moreover the relatively reduced SC technology threshold (169 nJ), GGG demonstrated excellent performance characteristics inside the shorter-wave infrared With all the exceptional pump pulse Electricity of 464 nJ, that is two situations decreased than in YAG: the largest red-shifted spectral broadening and the very best spectral Power density, outperforming KGW and YAG crystals in that part.
-switched method. The bandwidth while in the orthogonal orientation was Obviously Substantially broader. The calculated Fourier rework minimal pulse period was as small as sub-one hundred sixty fs. Underneath the configuration where the two crystals were being placed in a similar orientation, While using the seed input, the amplified pulse bandwidth was only 3 nm with one hundred eighty μJ Vitality when it broke the dichroic mirrors.
For tungstates, the ytterbium doping concentration can be quite significant with out major quenching as the changed ions have a very comparable ion radius, as well as the inter-ion distance is fairly substantial.
Having said that, at the time Nd3+:YAG grew to become commercially readily available, the fascination in CaWO4 dropped sharply. In afterwards yrs, sure other tungstate crystals began to catch the attention of a lot of attention.
In its elemental kind, gadolinium features a silvery-white appearance. Gadolinium is actually a uncommon earth or lanthanide factor that possesses exclusive Homes advantageous to specialized purposes such as semiconductor fabrication and nuclear reactor shielding. It's used for equally its significant magnetic instant (7.ninety fourμ B) and in phosphors and scintillator crystals. When complexed with EDTA ligands, it's applied being an injectable distinction agent for MRIs. The element is named after the Finnish chemist and geologist Johan Gadolin.
We program to boost the heart beat energy to higher than 40 mJ in two-phase multi-go amplifiers, akin website to a achieve factor of twenty. In each amplifier, we will even adopt two cascaded crystals positioned less than orthogonal orientation to decrease the thermal load on Just about every crystal and compensate for the achieve-narrowing effect.
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The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter of your stretcher (incident angle: fifty two°) Which with the compressor incident for the grating were being from the same facet; hence, a slight angular tuning of the grating could be made to obtain the very best compression result. During the compressor, the enter angle within the grating and the distance in between the interpretation phase (S1) along with the transmission grating (TG) have been created to compensate for that stretcher dispersion and all dispersion launched through the components.
-switched laser output beneath the two crystal placement configurations. The black line denotes the configuration Along with the crystals placed in the same orientation, whilst the crimson line is underneath the configuration of crystals positioned in orthogonal orientation.
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]. The dual-crystal configuration lowers the thermal load on Each and every crystal even though sustaining a higher achieve, and facilitates the payment of each’s thermal lensing outcome. For that reason, the laser cavity can work with a big security range over the thermal lensing outcome variation.