Indicators on KGW Crystal You Should Know
Indicators on KGW Crystal You Should Know
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Even though ytterbium-doped laser acquire media frequently show a small quantum defect, ytterbium-doped tungstates permit for especially smaller values. For instance, a 1030-nm Yb:YAG laser would Commonly be pumped close to 940 nm, While Yb:KGW or Yb:KYW may be most proficiently pumped around 981 nm.
For many programs, tungstates present a combination of numerous useful properties. Specifically for passive manner locking, ytterbium-doped double tungstates will often be top-quality to other media with regard to The mix of high attain bandwidth, substantial cross-sections, and relatively fantastic thermal Qualities �?even though in Every single individual discipline better products may very well be located.
Figure 7 exhibits the calculated dispersion payment end result. The compressed pulse length is around 185 fs if the period of enter pulses is a hundred and fifty fs. The discrepancy involving them will be noticeably minimized with a longer pulse input for the reason that uncompensated large-get dispersion matters considerably less for more time pulses. This configuration was accustomed to clearly show the compressibility of our amplified pulses at the preliminary section of our entire procedure. Later on we might undertake a grating-pair compressor for great compensation for top-buy dispersion.
In contrast, the seed laser can be amplified to in excess of 1 mJ beneath the orthogonal orientation configuration.
Amplified pulses using an Electrical power higher than two.five mJ might be anticipated by applying the next pump electrical power to your regenerative amplifier and making it work within the saturation amount. The laser fluence of ~1 J/cm2 around the dichroic mirrors is believed being beneath the harm threshold of higher-top quality dielectric-coated mirrors.
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Finally, we investigated the very long-phrase performances of SC technology in crystal samples beneath optimal pumping circumstances at better laser repetition rates. In doing so, the crystal samples were not translated and kept in a stationary place with regard into the pump beam over the overall measurement. The illustrations illustrating strong lengthy-time period performances of SC era in KGW and YAG crystals at large laser repetition rates can be found in other places. Additional precisely, secure overall performance of KGW crystal at 2 MHz pulse repetition rate under incredibly related pump beam focusing geometry was claimed recently30, While YAG crystal shown stable performance for various hours at two hundred kHz pulse repetition price In spite of very tight focusing on the pump beam (NA=0.085)32. The extensive-time period performance exams in LSO, LYSO and YSO uncovered gradual narrowing on the SC spectra over the long-wavelength facet that happened immediately after a particular exposure time and will be attributed into the optical degradation of those resources. For illustration, in LSO, the onset of spectral narrowing was noticed right after (sim twenty) minutes in a laser repetition amount of ten kHz, though in a laser repetition level of twenty kHz, steady SC technology overall performance was noticed just for about two min.
We strategy to spice up the heart beat Power to previously mentioned forty mJ in two-stage multi-pass amplifiers, corresponding to a attain variable of twenty. In Every single amplifier, we will even adopt two cascaded crystals placed less than orthogonal orientation to lessen the thermal load on Each individual crystal and compensate for your achieve-narrowing influence.
The threshold Vitality for SC technology (hbox E _ textrm th ) was described as the pump pulse Vitality, wherever the blue-shifted spectral broadening swiftly settles to a particular Slice-off wavelength That is still almost constant Despite even further improve of the pump pulse energy. The the best possible Electricity (hbox E _textrm decide ), was described since the pump pulse energy, which provides the most important crimson-shifted spectral broadening before the onset of periodic modulation within the SC spectrum because of filament refocusing.
Despite the fact that BGO, GGG, YSO, LSO and LYSO sometimes function laser hosts37, They may be generally recognized as economical scintillators, whose scintillation Homes are studied pretty well38. On the other hand, the nonlinear optical properties of such crystals and so their likely to function nonlinear components for SC technology particularly, and almost every other experiments concerning nonlinear propagation of extreme femtosecond laser pulses, keep on being really poorly examined. To date, GGG, LT23,twenty five and YSO24 were only sketchily tested for SC generation with Ti:sapphire laser pumping, nevertheless, to the most effective of our expertise, Not one of the investigated materials were examined with Yb-laser pumping, especially for what concerns their performance at incredibly superior (tens to many hundreds of click here kHz) pulse repetition rates.
A multi-go principal amplifier will further Raise the Vitality to above 40 mJ. We're going to apply cryogenically cooled Yb:KGW technology to restrain the thermal influence. Two stages of compression might be utilised following amplification. The primary phase involves a typical Treacy-style compressor, and could compress the heartbeat length to underneath three hundred fs having an performance of roughly 70%. The second stage requires a gasoline-stuffed multi-pass cell[
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KGW crystals are utilized as Raman scattering supplies given that they have sturdy Raman scattering at a quantity of various wavelengths. Whenever a laser beam is directed on to the crystal, the photons in the laser beam connect with the crystal lattice, triggering a number of the photons to scatter in a different course.