The KGW Crystal Diaries
The KGW Crystal Diaries
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The red-shifted A part of the SC is of sensible value, especially for what worries the functionality of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The shortage of seed photons inside the long-wavelength location from the SC spectrum limits the amplification performance and ends in pulse-to-pulse Power fluctuations across the degeneracy area in the optical parametric amplifier. This facet is quantified in Fig. 6a by plotting the SC spectra concerning spectral Power density, which was approximated by measuring the Vitality of your axial Portion of SC radiation (which is the only practically valuable Component of SC emission). KGW crystal generates the very best spectral Strength density in the 1200�?450 nm vary, as pointed out in the modern study30.
Its pump laser requires a short pulse length, a minimal time jitter, and sleek temporal and spatial distributions due to the intrinsic instantaneous process. As a result, the OPCPA technique is a lot more complex and costly.
The calculated Slash-off wavelengths for the quick-wavelength facet are consistent with the overall trend of blue-shifted spectral broadening on the bandgap of nonlinear product. All of the nonlinear elements made reasonable purple-shifted spectral broadenings below situations of optimum pump pulse energies, with the most important red-change exceeding 2000 nm measured in GGG crystal. Our effects unveiled that GGG and BGO (which also experienced the lowest supercontinuum generation threshold) present durable, optical harm-free overall performance at a laser repetition rate of 200 kHz, suggesting that these components are very good alternate options to YAG and KGW for lower threshold, significant common energy supercontinuum technology within the close to- and short-wave infrared spectral ranges. We also demonstrated that scintillating Attributes of bulk components may very well be commonly examined within the filamentation routine, by means of multiphoton excitation using close to-infrared femtosecond laser pulses.
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The blended obtain is elaborate and should be calculated under distinctive pumping circumstances because of the quasi-a few-level procedure behavior of your Yb-doped acquire medium. The blueshift, with just one peak from 1037 nm beneath the very same crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could consequence in the reabsorption losses at a protracted wavelength in the crystal wherever the laser polarization is parallel to its Nm -axis, earning the attain at 1035 nm better than that at 1037 nm beneath orthogonal orientation.
Thermal results are appreciably smaller sized in KGW. This along with the superior destruction threshold make the crystal a superb applicant for electricity scaling. Evaluating Ba(NO3)2 and KGW for Raman software Ba(NO3)two are simpler in the event of ns pulses and KGW �?in the event of ps pulses.
The brink Electrical power for SC generation (hbox E _ textrm th ) was outlined as being the pump pulse energy, the place the blue-shifted spectral broadening immediately settles to a certain Minimize-off wavelength That is still almost continual In spite of additional raise in the pump pulse Electricity. The ideal Electricity (hbox E _textrm choose ), was outlined given that the pump pulse energy, which generates the biggest pink-shifted spectral broadening ahead of the onset of periodic modulation within the SC spectrum on account of filament refocusing.
Despite the fact that BGO, GGG, YSO, LSO and LYSO sometimes function laser hosts37, they are principally identified as successful scintillators, whose scintillation properties are analyzed quite well38. Even so, the nonlinear optical Attributes of these crystals and so their probable to function nonlinear components for SC technology especially, and every other experiments relating to nonlinear propagation of intense femtosecond laser pulses, stay incredibly improperly studied. To this point, GGG, LT23,twenty five and YSO24 have been only sketchily analyzed for SC generation with Ti:sapphire laser pumping, nonetheless, to the most beneficial of our understanding, none of the investigated elements were examined with Yb-laser pumping, especially for what worries their performance at extremely large (tens to a huge selection of kHz) pulse repetition premiums.
KGW website has a strong Raman spectrum that extends through the ultraviolet to the close to infrared, making it helpful for A variety of purposes. The crystal can be utilized like a reference materials for Raman spectroscopy, as well as a sample for studying Raman scattering in the strong condition.
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KGW crystals are utilised as Raman scattering products as they have robust Raman scattering at a range of various wavelengths. Each time a laser beam is directed onto the crystal, the photons within the laser beam connect with the crystal lattice, triggering a lot of the photons to scatter in another direction.