A Simple Key For KGW Crystal Unveiled
A Simple Key For KGW Crystal Unveiled
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For some purposes, tungstates offer you a mix of numerous handy Qualities. Specifically for passive method locking, ytterbium-doped double tungstates are sometimes top-quality to other media regarding the combination of higher get bandwidth, big cross-sections, and relatively very good thermal Attributes �?Although in Just about every unique discipline better elements might be found.
In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear materials for broadband SC technology during the in the vicinity of-infrared and limited-wave infrared spectral ranges, when pumped by one hundred eighty fs fundamental harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO developed two octave-spanning SC spectra, which Review to SC spectra generated in YAG. These products show rather identical performances to YAG also with regards to threshold and best pump pulse energies for SC era. Having said that, for what considerations the likelihood to work at superior laser pulse repetition amount, YSO, LSO and LYSO demonstrate tough operation only at 10 kHz and speedily degrade (inside a few minutes) at 20 kHz. Moreover the rather low SC technology threshold (169 nJ), GGG shown superb overall performance qualities within the quick-wave infrared While using the optimum pump pulse Vitality of 464 nJ, and that is two situations lower than in YAG: the most important pink-shifted spectral broadening and the very best spectral Vitality density, outperforming KGW and YAG crystals in that facet.
-switched method. The bandwidth in the orthogonal orientation was clearly A great deal broader. The calculated Fourier change restricted pulse period was as limited as sub-a hundred and sixty fs. Beneath the configuration where The 2 crystals had been placed in exactly the same orientation, Together with the seed input, the amplified pulse bandwidth was only 3 nm with 180 μJ Power when it broke the dichroic mirrors.
The comparison with glasses is appropriate since the huge achieve bandwidth makes it possible for e.g. tungstate femtosecond lasers and tunable lasers to contend with glass lasers.
In the future, We'll undertake a laser seed having a broader spectral bandwidth and apply an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to help make full use from the acquire bandwidth of our regenerative amplifier.
At last, we investigated the lengthy-time period performances of SC era in crystal samples beneath optimal pumping circumstances at bigger laser repetition charges. In doing this, the crystal samples weren't translated and kept in a very stationary situation with respect towards the pump beam through the whole measurement. The examples illustrating strong lengthy-phrase performances of SC generation in KGW and YAG crystals at superior laser repetition rates can be uncovered in other places. Extra particularly, steady effectiveness of KGW crystal at two MHz pulse repetition level read more less than pretty identical pump beam concentrating geometry was claimed recently30, whereas YAG crystal shown secure efficiency for several several hours at 200 kHz pulse repetition price In spite of pretty restricted concentrating from the pump beam (NA=0.085)32. The extended-term overall performance checks in LSO, LYSO and YSO disclosed gradual narrowing on the SC spectra about the prolonged-wavelength side that occurred just after a particular exposure time and will be attributed on the optical degradation of such components. For example, in LSO, the onset of spectral narrowing was observed right after (sim 20) minutes at a laser repetition level of ten kHz, whilst at a laser repetition charge of 20 kHz, stable SC generation performance was noticed just for about two min.
The spectral measurements of filament-induced luminescence recommend that scintillating Attributes of supplies may very well be readily analyzed utilizing femtosecond near-infrared light resource by using multiphoton excitation in the filamentation regime, which lets uncomplicated separation of excitation and emission wavelengths and reduced possibility of optical harm.
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The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input on the stretcher (incident angle: 52°) and that of the compressor incident within the grating were being through the very same facet; consequently, a slight angular tuning of your grating could be produced to get the top compression result. From the compressor, the input angle to the grating and the gap concerning the interpretation stage (S1) as well as the transmission grating (TG) have been intended to compensate to the stretcher dispersion and all dispersion launched via the components.
A multi-move primary amplifier will more Strengthen the Strength to higher than 40 mJ. We will apply cryogenically cooled Yb:KGW technological innovation to restrain the thermal influence. Two levels of compression are going to be used just after amplification. The initial stage consists of a standard Treacy-kind compressor, and will compress the heart beat duration to under three hundred fs with the efficiency of roughly 70%. The next phase consists of a gas-crammed multi-move mobile[
Prognostic effect of late gadolinium enhancement in the danger stratification of coronary heart transplant people.
An example of such conduct is proven in Fig. 7a. The character of spectral variations is highlighted in Fig. 7d, which demonstrates how the SC spectrum around the long-wavelength aspect shrinks significantly, from 1800 nm to 1450 nm, just just after eight minutes of exposure time in the stationary sample. LT crystal shown considerably superior very long-term performance: at pulse repetition fees of as much as a hundred kHz no narrowing on either side with the SC spectrum was detected. Even so, immediate narrowing from the SC spectrum in LT crystal was observed right after the first five minutes of Procedure when the heart beat repetition level was set at two hundred kHz (information not proven). In contrast to the above products, BGO and GGG demonstrated exceptional SC era performances with no spectral adjustments in a pulse repetition rate of 200 kHz, as attested by the point number of SC spectra in BGO and GGG, proven in Fig. 7b and c, respectively. Figure 7e and f define identical shapes of SC spectra at the start and at the end of 1 hour-Long lasting measurement in each products.