5 Tips about KGW Crystal You Can Use Today
5 Tips about KGW Crystal You Can Use Today
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Sooner or later, an investigation within the spectral get curve of Yb:KGW in the most crucial amplifier will be carried out less than cryogenic temperature evolution from seventy seven K to 300 K. The Operating temperature are going to be managed to realize broader attain bandwidth and fewer shift with the central wavelength of the leading amplifier.
In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are productive nonlinear products for broadband SC generation inside the in the vicinity of-infrared and small-wave infrared spectral ranges, when pumped by 180 fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Evaluate to SC spectra made in YAG. These products show fairly related performances to YAG also with regard to threshold and optimal pump pulse energies for SC generation. Even so, for what considerations the possibility to operate at significant laser pulse repetition level, YSO, LSO and LYSO clearly show long lasting Procedure only at ten kHz and rapidly degrade (inside a couple of minutes) at 20 kHz. Apart from the somewhat lower SC generation threshold (169 nJ), GGG shown outstanding general performance characteristics while in the small-wave infrared Along with the best pump pulse Electricity of 464 nJ, that is two periods decrease than in YAG: the largest pink-shifted spectral broadening and the highest spectral Vitality density, outperforming KGW and YAG crystals in that element.
In contrast, the seed laser is often amplified to more than 1 mJ beneath the orthogonal orientation configuration.
The comparison with glasses is acceptable For the reason that big attain bandwidth will allow e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
On the other hand, as soon as Nd3+:YAG became commercially accessible, the interest in CaWO4 dropped sharply. In later years, sure other tungstate crystals began to draw in loads of interest.
Ultimately, we investigated the very long-term performances of SC generation in crystal samples underneath best pumping situations at bigger laser repetition rates. In doing so, the crystal samples weren't translated and stored inside a stationary placement with respect for the pump beam over the whole measurement. The illustrations illustrating robust prolonged-time period performances of SC generation in KGW and YAG crystals at significant laser repetition prices may very well check here be uncovered in other places. Far more specifically, steady general performance of KGW crystal at 2 MHz pulse repetition amount beneath incredibly similar pump beam concentrating geometry was noted recently30, whereas YAG crystal shown secure efficiency for a number of hours at 200 kHz pulse repetition charge In spite of really restricted focusing of the pump beam (NA=0.085)32. The very long-expression overall performance exams in LSO, LYSO and YSO unveiled gradual narrowing of the SC spectra over the very long-wavelength aspect that happened soon after a specific publicity time and could be attributed towards the optical degradation of these supplies. For example, in LSO, the onset of spectral narrowing was observed immediately after (sim twenty) minutes in a laser repetition level of ten kHz, while at a laser repetition price of 20 kHz, stable SC era performance was noticed just for roughly 2 min.
]. This method was based upon The point that the spectral emission cross-portion curves vary from each other when laser polarization is paralleled to different optical axis of Yb-doped double tungstates[
The threshold Electricity for SC era (hbox E _ textrm th ) was described because the pump pulse Vitality, where by the blue-shifted spectral broadening promptly settles to a particular cut-off wavelength That continues to be Just about continual Despite further more enhance on the pump pulse Power. The ideal Electricity (hbox E _textrm decide ), was described given that the pump pulse Electrical power, which produces the largest pink-shifted spectral broadening before the onset of periodic modulation while in the SC spectrum as a consequence of filament refocusing.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input with the stretcher (incident angle: fifty two°) Which of the compressor incident for the grating had been from the exact side; therefore, a slight angular tuning of your grating may very well be manufactured to get the very best compression final result. Inside the compressor, the enter angle around the grating and the distance amongst the interpretation phase (S1) and also the transmission grating (TG) have been built to compensate for the stretcher dispersion and all dispersion introduced because of the resources.
KGW has a robust Raman spectrum that extends through the ultraviolet into the in the vicinity of infrared, which makes it handy for A selection of programs. The crystal can be employed like a reference product for Raman spectroscopy, as well as a sample for studying Raman scattering in the good condition.
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]. The twin-crystal configuration lowers the thermal load on Every crystal although retaining a significant achieve, and facilitates the payment of each’s thermal lensing impact. Thus, the laser cavity can operate with a significant steadiness selection above the thermal lensing influence variation.