Facts About KGW Crystal Revealed
Facts About KGW Crystal Revealed
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Prior operate showed that the twin-crystal configuration can be employed to compensate for the thermal lensing impact[
When ytterbium-doped laser gain media frequently exhibit a little quantum defect, ytterbium-doped tungstates let for especially small values. By way of example, a 1030-nm Yb:YAG laser would Usually be pumped about 940 nm, Whilst Yb:KGW or Yb:KYW may be most efficiently pumped around 981 nm.
In the future, an investigation within the spectral attain curve of Yb:KGW in the primary amplifier will be performed below cryogenic temperature evolution from 77 K to 300 K. The Functioning temperature will be managed to appreciate broader acquire bandwidth and less change for the central wavelength of the key amplifier.
Determine seven reveals the calculated dispersion payment end result. The compressed pulse duration is around 185 fs if the length of enter pulses is a hundred and fifty fs. The discrepancy between them is going to be drastically diminished with an extended pulse enter simply because uncompensated high-order dispersion matters significantly less for longer pulses. This configuration was accustomed to present the compressibility of our amplified pulses with the preliminary stage of our full procedure. Later on we'd undertake a grating-pair compressor for great compensation for prime-order dispersion.
-switched manner. The bandwidth within the orthogonal orientation was Obviously Significantly broader. The calculated Fourier remodel restricted pulse length was as short as sub-a hundred and sixty fs. Under the configuration exactly where The 2 crystals ended up positioned in the same orientation, With all the seed input, the amplified pulse bandwidth was only 3 nm with 180 μJ Electricity when it broke the dichroic mirrors.
Right before the development of Nd:YAG, Nd3+:CaWO4 was a very important exceptional-earth-doped laser get medium. It was the truth is used in the initial repeatedly functioning crystal laser.
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Eventually, we investigated the extensive-term performances of SC technology in crystal samples below ideal pumping conditions at higher laser repetition rates. In doing so, the crystal samples weren't translated and retained in a stationary situation with regard into the pump beam in the total measurement. The illustrations illustrating strong prolonged-time period performances of SC technology in KGW and YAG crystals at significant laser repetition rates can be found somewhere else. Far more especially, steady general performance of KGW crystal at two MHz pulse repetition amount underneath pretty comparable pump beam focusing geometry was noted recently30, While YAG crystal demonstrated stable performance for several hours at two hundred get more info kHz pulse repetition charge even with quite limited focusing from the pump beam (NA=0.085)32. The long-time period overall performance tests in LSO, LYSO and YSO unveiled gradual narrowing in the SC spectra around the extended-wavelength side that happened soon after a particular publicity time and could be attributed towards the optical degradation of these components. By way of example, in LSO, the onset of spectral narrowing was noticed soon after (sim 20) minutes in a laser repetition charge of 10 kHz, whilst at a laser repetition charge of twenty kHz, secure SC generation overall performance was observed just for approximately 2 min.
The particular spectra ended up reconstructed by correcting the measured spectra by having an account for that filter transmission features and for that sensitivity features of the spectrometers at the information put up-processing stage. The spectral dynamics in Each individual sample was calculated by fine tuning the pump pulse Vitality with a computer-controlled attenuator that was integrated while in the laser system. Thermal Vitality meter EM (Ophir 3A-PF-twelve) was accustomed to evaluate the SC Power which was thereafter accustomed to compute the spectral Power density of the SC radiation. Every one of the measurements were done without any translation in the sample with regard into the pump beam.
The threshold Electrical power for SC technology (hbox E _ textrm th ) was described because the pump pulse Strength, where by the blue-shifted spectral broadening swiftly settles to a particular Lower-off wavelength That continues to be Just about regular Despite more enhance of the pump pulse Strength. The the best possible Strength (hbox E _textrm decide ), was outlined because the pump pulse Strength, which produces the largest purple-shifted spectral broadening ahead of the onset of periodic modulation in the SC spectrum because of filament refocusing.
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KGW has a strong Raman spectrum that extends through the ultraviolet into the around infrared, rendering it helpful for A variety of apps. The crystal may be used to be a reference material for Raman spectroscopy, as well as a sample for learning Raman scattering inside the reliable point out.
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