Not known Details About KGW Crystal
Not known Details About KGW Crystal
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Previous perform showed that the dual-crystal configuration can be used to compensate for the thermal lensing result[
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We employed a transmission grating (TG) to be a dispersive element within our stretcher and compressor. A compact configuration was adopted, where by the stretcher and also the compressor shared one grating similar to that in Ref.
In addition to its use as a Raman crystal, KGW is also Employed in other optical purposes, for instance in laser methods and to be a scintillator in medical imaging.
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Down the road, We are going to adopt a laser seed by using a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to produce complete use of the attain bandwidth of our regenerative amplifier.
At last, we investigated the extended-time period performances of SC era in crystal samples less than optimum pumping disorders at larger laser repetition fees. In doing so, the crystal samples weren't translated and kept in a very stationary placement with regard towards the pump beam in the whole measurement. The illustrations illustrating strong long-expression performances of SC technology in KGW and YAG crystals at high laser repetition costs could be located in other places. A lot more exclusively, stable general performance of KGW crystal at 2 MHz pulse repetition fee underneath very equivalent pump beam concentrating geometry was described recently30, Whilst YAG crystal demonstrated steady effectiveness for several hours at two hundred kHz pulse repetition fee In spite of incredibly limited concentrating of your pump beam (NA=0.085)32. The long-term performance tests in LSO, LYSO and YSO uncovered gradual narrowing on the SC spectra over the long-wavelength side that occurred soon after a specific publicity time and will be attributed to the optical degradation of these products. For example, in LSO, the onset of spectral narrowing was observed after (sim twenty) minutes in a laser repetition charge of 10 kHz, while in a laser repetition amount of 20 kHz, secure SC technology effectiveness was observed just for approximately two min.
The spectral measurements of filament-induced luminescence recommend that scintillating properties of products can be conveniently researched using femtosecond in close proximity to-infrared mild resource by means of multiphoton excitation within the filamentation regime, which makes it possible for simple separation of excitation and emission wavelengths and small chance of optical harm.
First of all, since the filament-induced luminescence originates from simultaneous absorption of quite a few photons, whose whole Vitality exceeds the bandgap energy of website fabric, it offers easy separation of excitation and emission wavelengths and presents quite strong sign Regardless of remaining emitted in excess of the entire stable angle. The position from the filament monitor inside the crystal is often very easily altered within a preferred way by different the pump pulse Electricity, Whilst the intensity clamping in a light-weight filament greatly lowers the potential risk of optical injury. These options could be handy for obtaining supplemental specifics of crystal homogeneity and reveal the presence and distribution of different dopants from the sample.
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KGW has a strong Raman spectrum that extends from your ultraviolet towards the around infrared, rendering it beneficial for A variety of applications. The crystal can be utilized as a reference material for Raman spectroscopy, as well as a sample for researching Raman scattering during the stable condition.
Figure four Beam radius variation on The 2 crystals whilst changing the focal size from the thermal lensing outcome.
Each energies are marked through the dashed traces as well as their values are labeled during the plots. The identical attributes were being also noticed in KGW and YAG crystals, whose spectral broadening dynamics are shown to get a comparison in Fig. 4.