The best Side of KGW Crystal
The best Side of KGW Crystal
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The purple-shifted Component of the SC is of functional significance, especially for what fears the effectiveness of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The lack of seed photons inside the long-wavelength region on the SC spectrum restrictions the amplification effectiveness and ends in pulse-to-pulse Electrical power fluctuations round the degeneracy location from the optical parametric amplifier. This part is quantified in Fig. 6a by plotting the SC spectra with regards to spectral Strength density, which was approximated by measuring the Strength of your axial Element of SC radiation (which is the only virtually valuable Element of SC emission). KGW crystal provides the very best spectral energy density from the 1200�?450 nm assortment, as famous in a latest study30.
-switched method. The bandwidth inside the orthogonal orientation was Plainly Considerably broader. The calculated Fourier transform constrained pulse period was as quick as sub-160 fs. Underneath the configuration exactly where the two crystals were positioned in the same orientation, with the seed input, the amplified pulse bandwidth was only three nm with 180 μJ Electrical power when it broke the dichroic mirrors.
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Having said that, after Nd3+:YAG became commercially readily available, the fascination in CaWO4 dropped sharply. In afterwards yrs, specific other tungstate crystals began to catch the attention of plenty of attention.
Last but not least, we investigated the prolonged-phrase performances of SC generation in crystal samples underneath optimal pumping circumstances at higher laser repetition costs. In doing this, the crystal samples were not translated and held inside a stationary posture with respect to your pump beam during the complete measurement. The examples illustrating robust lengthy-term performances of SC technology in KGW and YAG crystals at high laser repetition prices can be located elsewhere. Much more particularly, secure general performance of KGW crystal at two MHz pulse repetition fee under pretty equivalent pump beam concentrating geometry was claimed recently30, While YAG crystal shown secure overall performance for a number of hours at two hundred kHz pulse repetition price In spite of quite limited concentrating of your pump beam (NA=0.085)32. The very long-time period effectiveness exams in LSO, LYSO and YSO disclosed gradual narrowing of the SC spectra to the very long-wavelength aspect that transpired following a certain publicity time and will be attributed to your optical degradation of those materials. By way of example, in LSO, the onset of spectral narrowing was noticed right after (sim twenty) minutes in a laser repetition rate of ten kHz, whilst in a laser repetition price of 20 kHz, stable SC era effectiveness was observed just for approximately two min.
]. This process was based upon The reality that the spectral emission cross-part curves vary from one another when laser polarization is paralleled to the different optical axis of Yb-doped double tungstates[
The threshold Electricity for SC era (hbox E _ textrm th ) was outlined given that the pump pulse Power, the place the blue-shifted spectral broadening speedily settles to a specific Reduce-off wavelength That continues to be almost continual Despite having even more increase in the pump pulse Strength. The the best possible Strength (hbox E _textrm opt ), was described as the pump pulse Vitality, which makes the most important pink-shifted spectral broadening before the onset of periodic modulation while in the SC spectrum as a consequence of filament refocusing.
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