The KGW Crystal Diaries
The KGW Crystal Diaries
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Preceding work showed that the dual-crystal configuration can be utilized to compensate for that thermal lensing outcome[
The thermal conductivity of typical double tungstates is in the order to 3–four W/(K m) �?which is not poor as opposed with other laser crystals (Despite the fact that a number of periods below for YAG), and pretty large in comparison While using the thermal conductivity of regular glasses.
The achieve bandwidth e.g. of Yb:KGW and Yb:KYW is very significant as opposed with that of Yb:YAG. This allows for broad wavelength tunability and for A lot shorter pulse durations from mode-locked lasers. Values nicely beneath one hundred fs happen to be achieved with passive method locking.
The 1st two peaks may very well be affiliated with luminescence of pure material59, while the remaining peaks can be attributed to the luminescence of unidentified dopants, Even though the supplier specified the sample as undoped. The luminescence of YAG crystal generates strong UV luminescence by using a most intensity at 300 nm, that is attributed to put together self-trapped exciton and antisite defect-connected emissions60. Lastly, no luminescence from the UV, noticeable and close to-IR was observed in KGW and LT crystals, at the very least in the detection number of fiber spectrometer (two hundred�?00 nm).
-switched mode. The bandwidth within the orthogonal orientation was Obviously A great deal broader. The calculated Fourier rework confined pulse length was as short as sub-one hundred sixty fs. Underneath the configuration wherever the two crystals ended up positioned in the exact same orientation, Along with the seed input, the amplified pulse bandwidth was only three nm with one hundred eighty μJ Electricity when it broke the dichroic mirrors.
For tungstates, the ytterbium doping concentration can be quite significant with out important quenching since the replaced ions have an exceptionally similar ion radius, and also the inter-ion length is comparatively significant.
Several methods happen to be adopted to resolve this issue. An acousto-optical programmable dispersive filter may be utilized to modulate the seed’s spectrum to suppress the achieve-narrowing impact[
KGW (potassium gadolinium tungstate) can be a crystal that is often utilized like a Raman crystal in Raman spectroscopy. It's a colorless, clear crystal that includes a significant Raman scattering performance and a powerful Raman spectrum, rendering it suited to a range of Raman programs.
The spectral measurements of filament-induced luminescence counsel that scintillating Houses of products could possibly be quickly analyzed making use of femtosecond around-infrared mild supply by using multiphoton excitation from the filamentation regime, which lets uncomplicated separation of excitation and emission wavelengths and lower chance of optical problems.
The edge Electrical power for SC era (hbox E _ textrm th ) was outlined given that the pump pulse Electrical power, where by the blue-shifted spectral broadening swiftly settles to a certain Slice-off wavelength That is still Nearly constant even with additional raise on the pump pulse Vitality. The optimum Electrical power (hbox E _textrm choose ), was described given that the pump pulse energy, which provides the largest pink-shifted spectral broadening before the onset of periodic modulation inside the SC spectrum because of filament refocusing.
Whilst BGO, GGG, YSO, LSO and LYSO at times serve as laser hosts37, They are really primarily identified as efficient scintillators, whose scintillation Attributes are analyzed quite well38. Nonetheless, the nonlinear optical Houses of those crystals and so their probable to serve as nonlinear resources for SC technology especially, and some other experiments concerning nonlinear propagation of powerful femtosecond laser pulses, remain pretty inadequately analyzed. So far, GGG, LT23,25 and YSO24 have been only sketchily analyzed for SC generation with Ti:sapphire laser pumping, nonetheless, to the best of our know-how, none of the investigated products were examined with Yb-laser pumping, especially for what problems their general performance at quite high (tens to countless kHz) pulse repetition fees.
-switched output spectrum of your regenerative amplifier supports a sub-160 fs pulse amplification. Consequently, pulses with energies of as much as 2 mJ and length underneath 200 fs might be received making use of greater-high quality dichroic mirrors plus a broader-spectrum laser seed. This regenerative amplifier functions as a very good pre-amplifier for additional laser amplification.
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An example of this kind of conduct is shown in Fig. 7a. The character of spectral modifications is highlighted in Fig. 7d, which exhibits how the SC spectrum about the long-wavelength facet shrinks substantially, from 1800 nm to 1450 nm, just after 8 minutes of exposure time in a click here stationary sample. LT crystal demonstrated to some degree greater long-time period efficiency: at pulse repetition costs of as much as one hundred kHz no narrowing on both facet of your SC spectrum was detected. Even so, quick narrowing of the SC spectrum in LT crystal was noticed soon after the primary 5 minutes of Procedure when the pulse repetition price was set at 200 kHz (information not proven). In distinction to the above mentioned products, BGO and GGG shown great SC era performances with none spectral improvements at a pulse repetition rate of 200 kHz, as attested by the time series of SC spectra in BGO and GGG, demonstrated in Fig. 7b and c, respectively. Determine 7e and file outline equivalent designs of SC spectra firstly and at the end of one hour-lasting measurement in both equally products.