Fascination About KGW Crystal
Fascination About KGW Crystal
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The get bandwidth e.g. of Yb:KGW and Yb:KYW is incredibly massive when compared with that of Yb:YAG. This allows for huge wavelength tunability and for Considerably shorter pulse durations from mode-locked lasers. Values perfectly down below one hundred fs happen to be obtained with passive mode locking.
In its elemental type, potassium has a silvery grey metallic visual appeal, but its compounds (for example potassium hydroxide) tend to be more often Employed in industrial and chemical purposes.
The monoclinic crystal constructions results in a all-natural birefringence, helping to prevent thermally induced polarization rotation and depolarization reduction.
For tungstates, the ytterbium doping concentration can be quite large with out considerable quenching as the replaced ions have a really equivalent ion radius, plus the inter-ion length is pretty huge.
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At last, we investigated the lengthy-expression performances of SC generation in crystal samples below best pumping conditions at higher laser repetition charges. In doing this, the crystal samples were not translated and retained in a very stationary situation with respect towards the pump beam during the complete measurement. The illustrations illustrating sturdy very long-phrase performances of SC technology in KGW and YAG crystals at significant laser repetition costs may be identified in other places. More especially, secure efficiency of KGW crystal at 2 MHz pulse repetition charge underneath pretty related pump beam concentrating geometry was noted recently30, While YAG crystal shown secure effectiveness for several hrs at 200 kHz pulse repetition level In spite of very limited focusing from the pump beam (NA=0.085)32. The extended-term general performance exams in LSO, LYSO and YSO disclosed gradual narrowing of your SC spectra to the extended-wavelength facet that transpired following a specific publicity time and could be attributed to the optical degradation of those supplies. For instance, in LSO, the onset of spectral narrowing was observed right after (sim 20) minutes at a laser repetition level of ten kHz, while in a laser repetition price of 20 kHz, steady SC era overall performance was observed just for about two min.
As a result, with an additional advancement within our regenerative amplifier, two mJ compressed pulses may be anticipated, without having harming any component within our compressor.
The threshold Strength for SC technology (hbox E _ textrm th ) was described as being the pump pulse Power, where the blue-shifted spectral broadening more info immediately settles to a particular Lower-off wavelength That continues to be Nearly frequent even with further improve in the pump pulse Power. The ideal energy (hbox E _textrm opt ), was outlined as the pump pulse energy, which provides the largest red-shifted spectral broadening prior to the onset of periodic modulation while in the SC spectrum as a consequence of filament refocusing.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input from the stretcher (incident angle: 52°) Which of the compressor incident for the grating had been in the exact aspect; therefore, a slight angular tuning with the grating can be built to obtain the very best compression end result. From the compressor, the input angle over the grating and the space involving the interpretation phase (S1) and also the transmission grating (TG) were intended to compensate for your stretcher dispersion and all dispersion introduced with the products.
Since its discovery in 19701,2, the condition of your art of supercontinuum (SC) era in bulk good-condition materials has attained a higher amount of maturity thanks to incredible development of ultrafast laser sources and elementary knowledge of the fundamental physical processes3,four. The complexity of Bodily consequences fundamental SC technology is unveiled during the framework of femtosecond filamentation, that is a common phenomenon arising from nonlinear propagation of femtosecond laser pulses in transparent materials5. In more practical conditions, the attainable spectral extent of SC radiation is dependent upon the fabric Homes, for example linear and nonlinear indexes of refraction and Electrical power bandgap, which along with the laser wavelength determine the vital power for self-focusing (that has to get exceeded for a lightweight filament to type) and clamping depth of a light filament (that is proportional for the get of multiphoton absorption), respectively.
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Both equally energies are marked via the dashed strains as well as their values are labeled from the plots. The equivalent options ended up also noticed in KGW and YAG crystals, whose spectral broadening dynamics are proven to get a comparison in Fig. 4.