Little Known Facts About KGW Crystal.
Little Known Facts About KGW Crystal.
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In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are efficient nonlinear components for broadband SC era inside the near-infrared and quick-wave infrared spectral ranges, when pumped by a hundred and eighty fs fundamental harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO made two octave-spanning SC spectra, which Examine to SC spectra produced in YAG. These resources exhibit pretty equivalent performances to YAG also with regard to threshold and optimum pump pulse energies for SC era. However, for what considerations the chance to work at substantial laser pulse repetition rate, YSO, LSO and LYSO demonstrate strong Procedure only at 10 kHz and swiftly degrade (in a couple of minutes) at twenty kHz. In addition to the somewhat minimal SC era threshold (169 nJ), GGG shown wonderful general performance properties in the shorter-wave infrared with the exceptional pump pulse Strength of 464 nJ, that's two instances decrease than in YAG: the largest pink-shifted spectral broadening and the very best spectral Vitality density, outperforming KGW and YAG crystals in that facet.
-switched manner. The bandwidth in the orthogonal orientation was clearly much broader. The calculated Fourier remodel limited pulse length was as limited as sub-one hundred sixty fs. Beneath the configuration in which the two crystals had been put in the same orientation, While using the seed input, the amplified pulse bandwidth was only 3 nm with 180 μJ Electricity when it broke the dichroic mirrors.
Right before the development of Nd:YAG, Nd3+:CaWO4 was a very important unusual-earth-doped laser attain medium. It was the truth is Utilized in the initial continuously running crystal laser.
One other was placed with its Np -axis parallel While using the s-polarized route. A comparison was made among a configuration Using the crystals placed in the identical orientation (
Finally, we investigated the prolonged-term performances of SC era in crystal samples less than best pumping circumstances at bigger laser repetition charges. In doing this, the crystal samples weren't translated and stored inside of a stationary place with regard into the pump beam over the whole measurement. The examples illustrating strong lengthy-expression performances of SC generation in KGW and YAG crystals at significant laser repetition premiums could be located elsewhere. A lot more specifically, stable general performance of KGW crystal at two MHz pulse repetition charge less than extremely very similar pump beam focusing geometry was documented recently30, whereas YAG crystal shown secure overall performance for many several hours at 200 kHz pulse repetition charge In spite of quite limited focusing from the pump beam (NA=0.085)32. The extended-expression performance tests in LSO, LYSO and YSO uncovered gradual narrowing on website the SC spectra to the long-wavelength side that occurred right after a particular exposure time and will be attributed to the optical degradation of these supplies. As an illustration, in LSO, the onset of spectral narrowing was observed soon after (sim 20) minutes at a laser repetition charge of ten kHz, though in a laser repetition level of twenty kHz, steady SC era overall performance was observed just for approximately two min.
Thermal results are appreciably smaller in KGW. This along with the substantial problems threshold make the crystal an excellent applicant for ability scaling. Comparing Ba(NO3)2 and KGW for Raman application Ba(NO3)2 are simpler in case of ns pulses and KGW �?in case of ps pulses.
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]. The twin-crystal configuration lowers the thermal load on each crystal although protecting a higher achieve, and facilitates the payment of each one’s thermal lensing impact. Thus, the laser cavity can work with a big security vary over the thermal lensing impact variation.