Fascination About KGW Crystal
Fascination About KGW Crystal
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In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear elements for broadband SC technology within the close to-infrared and small-wave infrared spectral ranges, when pumped by one hundred eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Assess to SC spectra created in YAG. These components show really comparable performances to YAG also with regards to threshold and best pump pulse energies for SC generation. On the other hand, for what issues the likelihood to function at large laser pulse repetition amount, YSO, LSO and LYSO show strong operation only at 10 kHz and rapidly degrade (in just a few minutes) at twenty kHz. Moreover the fairly small SC technology threshold (169 nJ), GGG demonstrated exceptional functionality properties inside the limited-wave infrared Together with the exceptional pump pulse Power of 464 nJ, which is two occasions lessen than in YAG: the largest purple-shifted spectral broadening and the best spectral Electricity density, outperforming KGW and YAG crystals in that element.
The datasets used and/or analysed through the current research available within the corresponding author on affordable ask for.
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A number of procedures are adopted to solve this problem. An acousto-optical programmable dispersive filter can be used to modulate the seed’s spectrum to suppress the get-narrowing impact[
The blended get is intricate and should be calculated under different pumping conditions as a result of quasi-three-degree technique conduct with the Yb-doped achieve medium. The blueshift, with a person peak from 1037 nm beneath the identical crystal placement orientation to 1035 nm beneath the orthogonal crystal placement orientation, could outcome from the reabsorption losses at a protracted wavelength from the crystal exactly where the laser polarization is parallel to its Nm -axis, building the attain at 1035 nm greater than that at 1037 nm beneath orthogonal orientation.
Although BGO and LT manufactured the narrowest SC spectra (somewhat a lot less than 1.5 optical octaves), they could be seen as really desirable nonlinear components for broadband SC generation with pumping at lengthier laser wavelengths. Owing to its substantial nonlinearity, BGO exhibited the bottom SC technology threshold (seventy eight nJ) One of the investigated components, which is twenty five % lower than in KGW and could be considered as excellent nonlinear substance for really very low-threshold SC generation. The noticed steady and durable damage-totally free overall performance of BGO and GGG at 200 kHz pulse repetition level implies that these nonlinear resources have a potential for SC technology at even higher, MHz, repetition prices. Furthermore, these resources deliver SC radiation with an excellent list of parameters which might be important for purposes in large velocity spectroscopy and imaging that make use of bulk-created SC, see e.g.17,18,19,20.
The threshold Strength for SC generation (hbox E _ textrm th ) was defined since the pump pulse Strength, the place the blue-shifted spectral broadening rapidly settles to a certain Slash-off wavelength That is still Nearly frequent even with more enhance of your pump pulse Power. The ideal energy (hbox E _textrm decide ), was described given that the pump pulse Power, which creates the largest pink-shifted spectral broadening ahead of the onset of periodic modulation from the SC spectrum due to filament refocusing.
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-switched output spectrum of the regenerative amplifier supports a sub-a hundred and sixty fs pulse amplification. Hence, pulses with energies of as many as two mJ and length down below 200 fs could be received applying greater-excellent dichroic mirrors as well as a broader-spectrum laser seed. This regenerative amplifier is effective as a great pre-amplifier for further more laser amplification.
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Each energies are marked because of the dashed strains as well as their values are labeled in the plots. The equivalent capabilities ended up also more info observed in KGW and YAG crystals, whose spectral broadening dynamics are proven for your comparison in Fig. 4.