New Step by Step Map For KGW Crystal
New Step by Step Map For KGW Crystal
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Earlier get the job done showed that the dual-crystal configuration may be used to compensate for your thermal lensing outcome[
Though ytterbium-doped laser gain media normally exhibit a small quantum defect, ytterbium-doped tungstates allow for for notably smaller values. For instance, a 1030-nm Yb:YAG laser would Generally be pumped all around 940 nm, Whilst Yb:KGW or Yb:KYW can be most efficiently pumped around 981 nm.
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Determine 7 reveals the calculated dispersion payment consequence. The compressed pulse duration is all-around 185 fs in the event the length of enter pulses is a hundred and fifty fs. The discrepancy involving them will likely be substantially decreased with a longer pulse input for the reason that uncompensated superior-purchase dispersion matters considerably less for lengthier pulses. This configuration was accustomed to clearly show the compressibility of our amplified pulses on the preliminary section of our complete procedure. In the future we'd adopt a grating-pair compressor for great compensation for top-order dispersion.
The monoclinic crystal buildings brings about a purely natural birefringence, assisting to steer clear of thermally induced polarization rotation and depolarization reduction.
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Eventually, we investigated the extended-phrase performances of SC era in crystal samples beneath optimum pumping disorders at higher laser repetition rates. In doing so, the crystal samples weren't translated and held inside a stationary position with respect into the pump beam in the course of the full measurement. The examples illustrating sturdy lengthy-time period performances of SC generation in KGW and YAG crystals at substantial laser repetition fees could possibly be uncovered elsewhere. Additional particularly, stable general performance of KGW crystal at two MHz pulse repetition charge under quite similar pump beam focusing geometry was claimed recently30, Whilst YAG crystal demonstrated stable efficiency for a number of several hours at two hundred kHz pulse repetition level Despite quite limited focusing from the pump beam (NA=0.085)32. The lengthy-phrase performance checks in LSO, LYSO and YSO disclosed gradual narrowing from the SC spectra on the very long-wavelength side that occurred following a specific publicity time and will be attributed on the optical degradation of those resources. For instance, in LSO, the onset of spectral narrowing was noticed following (sim twenty) minutes at a laser repetition amount of ten kHz, whilst at a laser repetition rate of twenty kHz, secure SC generation efficiency was noticed just for about two min.
The actual spectra had been reconstructed by correcting the calculated spectra having an account for the filter transmission functions and with the sensitivity functions on the spectrometers at the info post-processing stage. The spectral dynamics in Every single sample was calculated by fantastic tuning the pump pulse Vitality with a pc-controlled attenuator which was integrated while in the laser process. Thermal energy meter EM (Ophir 3A-PF-12) was utilized to measure the SC Strength which was thereafter used to compute the spectral Power density of your SC radiation. All of the measurements were carried out with none translation on the sample with respect to the pump beam.
The threshold Electricity for SC technology (hbox E _ textrm th ) was described given that the pump pulse Electrical power, wherever the blue-shifted spectral broadening quickly settles to a certain Lower-off wavelength That continues to be Pretty much regular In spite of additional boost from the pump pulse Power. The optimum click here Electrical power (hbox E _textrm choose ), was outlined given that the pump pulse energy, which makes the biggest red-shifted spectral broadening before the onset of periodic modulation inside the SC spectrum as a consequence of filament refocusing.
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Given that its discovery in 19701,two, the point out of the art of supercontinuum (SC) generation in bulk sound-point out resources has attained a higher volume of maturity due to tremendous progress of ultrafast laser sources and fundamental idea of the fundamental physical processes3,four. The complexity of Bodily consequences fundamental SC era is unveiled within the framework of femtosecond filamentation, which can be a common phenomenon arising from nonlinear propagation of femtosecond laser pulses in transparent materials5. In more sensible terms, the attainable spectral extent of SC radiation will depend on the fabric properties, for instance linear and nonlinear indexes of refraction and Vitality bandgap, which along with the laser wavelength define the critical ability for self-focusing (which has being exceeded for a light-weight filament to kind) and clamping depth of a light filament (which can be proportional on the order of multiphoton absorption), respectively.
The scattered photons have a different wavelength and Electricity compared to the incident photons, which results in a Raman spectrum.
]. The twin-crystal configuration lowers the thermal load on Each and every crystal even though keeping a large obtain, and facilitates the payment of every one’s thermal lensing influence. Consequently, the laser cavity can get the job done with a substantial steadiness variety above the thermal lensing effect variation.