The Definitive Guide to KGW Crystal
The Definitive Guide to KGW Crystal
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While ytterbium-doped laser attain media generally exhibit a small quantum defect, ytterbium-doped tungstates permit for specially modest values. As an example, a 1030-nm Yb:YAG laser would Commonly be pumped all over 940 nm, While Yb:KGW or Yb:KYW might be most efficiently pumped about 981 nm.
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In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear materials for broadband SC era during the near-infrared and brief-wave infrared spectral ranges, when pumped by one hundred eighty fs fundamental harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Evaluate to SC spectra produced in YAG. These components show rather equivalent performances to YAG also regarding threshold and ideal pump pulse energies for SC technology. Having said that, for what concerns the possibility to function at significant laser pulse repetition level, YSO, LSO and LYSO show long lasting operation only at ten kHz and rapidly degrade (within a few minutes) at 20 kHz. Other than the somewhat small SC generation threshold (169 nJ), GGG shown fantastic effectiveness properties while in the shorter-wave infrared Using the best pump pulse Electrical power of 464 nJ, that is two periods decreased than in YAG: the biggest pink-shifted spectral broadening and the best spectral energy density, outperforming KGW and YAG crystals in that factor.
Substitute with the Computer system for a much better a person or simply a great adjustment of the Computer system orientation as well as utilized substantial voltage is needed to steer clear of this phenomenon. A fast pulse picker may be used to Increase the nanosecond-scale contrast of the output most important pulse.
The calculated Reduce-off wavelengths in the brief-wavelength facet are according to the overall development of blue-shifted spectral broadening on the bandgap of nonlinear substance. Every one of the nonlinear materials created affordable pink-shifted spectral broadenings beneath ailments of ideal pump pulse energies, with the largest pink-change exceeding 2000 nm measured in GGG crystal. Our effects unveiled that GGG and BGO (which also experienced the bottom supercontinuum generation threshold) provide durable, optical damage-no cost efficiency at a laser repetition charge of 200 kHz, suggesting that these products are superior alternate options to YAG and KGW for lower threshold, higher normal power supercontinuum era in the in close proximity to- and limited-wave infrared spectral ranges. We also shown that scintillating Qualities of bulk products may very well be readily examined during the filamentation regime, by using multiphoton excitation working with close to-infrared femtosecond laser pulses.
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The black line denotes the configuration With all the crystals put in the exact same orientation, though the crimson line is underneath the configuration of crystals put in orthogonal orientation.
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The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter on the stretcher (incident angle: 52°) Which with the compressor incident with the grating have been from your exact aspect; therefore, a slight angular tuning of the grating can be manufactured to obtain the very best compression result. In the compressor, the enter angle around the grating and the gap among the interpretation phase (S1) and also the transmission grating (TG) were meant to compensate to the stretcher dispersion and all dispersion launched by the supplies.
Given that its discovery in 19701,two, the state from the artwork of supercontinuum (SC) era in bulk solid-state resources has achieved a large level of maturity owing to huge progress of ultrafast laser sources and basic knowledge of the fundamental physical processes3,four. The complexity of physical results underlying SC generation is unveiled while in the framework of femtosecond filamentation, which happens to be a common phenomenon arising from nonlinear propagation of femtosecond laser pulses in transparent materials5. In more simple terms, the attainable spectral extent of SC radiation will depend on the fabric Houses, which include linear and nonlinear indexes of refraction and Power bandgap, which together with the laser wavelength outline the essential electricity for self-focusing (that has to become exceeded for a light filament to kind) and clamping depth of a light filament (and that is proportional towards the get of multiphoton absorption), respectively.
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Equally energies are marked through the dashed strains and their values are labeled while in the plots. The equivalent attributes ended up also observed in KGW and YAG crystals, whose spectral broadening dynamics are revealed for the comparison in Fig. four.