5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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Figure seven demonstrates the calculated dispersion compensation consequence. The compressed pulse length is close to 185 fs once the length of enter pulses is a hundred and fifty fs. The discrepancy amongst them will be appreciably minimized with a longer pulse input mainly because uncompensated higher-purchase dispersion issues fewer for lengthier pulses. This configuration was utilized to clearly show the compressibility of our amplified pulses within the preliminary period of our full technique. Later on we'd undertake a grating-pair compressor for high-quality compensation for high-order dispersion.
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Prior to the development of Nd:YAG, Nd3+:CaWO4 was a very important unusual-earth-doped laser achieve medium. It absolutely was the truth is Employed in the primary continually working crystal laser.
The opposite was put with its Np -axis parallel While using the s-polarized way. A comparison was created amongst a configuration with the crystals positioned in the exact same orientation (
Last but not least, we investigated the lengthy-time period performances of SC generation in crystal samples underneath optimum pumping ailments at greater laser repetition costs. In doing this, the crystal samples weren't translated and kept within a stationary posture with respect to the pump beam over the whole measurement. The illustrations illustrating strong extended-time period performances of SC generation in KGW and YAG crystals at significant laser repetition charges could be located somewhere else. Extra especially, steady efficiency of KGW crystal at two MHz pulse repetition amount less than extremely equivalent pump beam focusing geometry was documented recently30, While YAG crystal shown steady effectiveness for several hours at two hundred kHz pulse repetition level even with incredibly limited focusing in the pump beam (NA=0.085)32. The prolonged-time period performance tests in LSO, LYSO and YSO uncovered gradual narrowing with the SC spectra around the extended-wavelength side that occurred following a certain exposure time and could be attributed for the optical degradation of those components. As an illustration, in LSO, the onset of spectral narrowing was observed right after (sim 20) minutes at a laser repetition rate of 10 kHz, when at a laser repetition level of 20 kHz, secure SC technology effectiveness was observed just for approximately 2 min.
The actual spectra ended up reconstructed by correcting the measured spectra having an account to the filter transmission capabilities and for your sensitivity capabilities on the spectrometers at the data put up-processing stage. The spectral dynamics in Just about every sample was measured by great tuning the pump pulse Strength with a computer-controlled attenuator which was integrated during the laser procedure. Thermal Power meter EM (Ophir 3A-PF-12) was accustomed to evaluate the SC energy which was thereafter accustomed to estimate the spectral energy density on the SC radiation. Many of the measurements had been done with none translation of the sample with respect on the pump beam.
The crimson-shifted A part of the SC spectrum in BGO has the bottom spectral Electrical power density, and that is 1–2 orders of magnitude lessen than in the remainder of the components. Nevertheless, very small Strength threshold of SC era, as well as small ideal pump Strength in BGO, should be identified. The approximated spectral Power densities manufactured in LSO and LYSO are rather much like YAG throughout the big Portion of the SC spectrum. One of the most intriguing finding in that regard is GGG crystal, which, Even with extremely average blue-shifted spectral broadening, creates the most important spectral red-shift and the best spectral Vitality density during the 1600�?000 nm variety, which is nearly an get of magnitude larger than that manufactured in YAG.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input of the stretcher (incident angle: fifty two°) Which in the compressor incident on the grating were with the similar aspect; that's why, a slight angular tuning in the grating might be designed to get the very best compression consequence. While in the compressor, the enter angle to the grating click here and the gap among the translation phase (S1) along with the transmission grating (TG) have been made to compensate for the stretcher dispersion and all dispersion released with the supplies.
-switched laser output underneath the two crystal placement configurations. The black line denotes the configuration with the crystals put in precisely the same orientation, though the purple line is beneath the configuration of crystals put in orthogonal orientation.
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]. The twin-crystal configuration lowers the thermal load on each crystal whilst preserving a significant get, and facilitates the compensation of each one’s thermal lensing outcome. Consequently, the laser cavity can operate with a significant stability vary in excess of the thermal lensing result variation.