The best Side of KGW Crystal
The best Side of KGW Crystal
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Whilst ytterbium-doped laser get media frequently exhibit a little quantum defect, ytterbium-doped tungstates let for especially tiny values. Such as, a 1030-nm Yb:YAG laser would normally be pumped around 940 nm, whereas Yb:KGW or Yb:KYW could be most proficiently pumped close to 981 nm.
The get bandwidth e.g. of Yb:KGW and Yb:KYW is very massive in contrast with that of Yb:YAG. This enables for large wavelength tunability and for Considerably shorter pulse durations from manner-locked lasers. Values nicely under a hundred fs have already been obtained with passive method locking.
Determine 7 reveals the calculated dispersion compensation end result. The compressed pulse period is all-around 185 fs once the duration of enter pulses is a hundred and fifty fs. The discrepancy involving them are going to be substantially lessened with an extended pulse input simply because uncompensated high-get dispersion matters fewer for more time pulses. This configuration was used to present the compressibility of our amplified pulses for the preliminary period of our whole process. Later on we might adopt a grating-pair compressor for great compensation for high-buy dispersion.
Its pump laser requires a short pulse length, a minimal time jitter, and easy temporal and spatial distributions due to intrinsic instantaneous procedure. Therefore, the OPCPA process is more difficult and pricey.
For tungstates, the ytterbium doping focus can be quite high with out major quenching since the replaced ions have an incredibly comparable ion radius, along with the inter-ion length is fairly significant.
In the future, We are going to undertake a laser seed having a broader spectral bandwidth and implement an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to make complete use of the achieve bandwidth of our regenerative amplifier.
Eventually, we investigated the extended-phrase performances of SC technology in crystal samples underneath optimal pumping situations at higher laser repetition charges. In doing this, the crystal samples were not translated and retained in a stationary position with respect to the pump beam in the course of the complete measurement. The examples illustrating strong long-time period performances of SC technology in KGW and YAG crystals at higher laser repetition rates could possibly be found in other places. Extra especially, steady overall performance of KGW crystal at 2 MHz pulse repetition price underneath really identical pump beam focusing geometry was documented recently30, whereas YAG crystal demonstrated steady functionality for quite a check here few several hours at 200 kHz pulse repetition level Despite quite tight concentrating on the pump beam (NA=0.085)32. The extended-expression effectiveness checks in LSO, LYSO and YSO exposed gradual narrowing of the SC spectra about the extensive-wavelength side that occurred right after a certain exposure time and could be attributed towards the optical degradation of those products. For illustration, in LSO, the onset of spectral narrowing was noticed after (sim 20) minutes at a laser repetition charge of ten kHz, whilst at a laser repetition amount of twenty kHz, stable SC generation effectiveness was noticed just for approximately two min.
]. This technique was based on the fact that the spectral emission cross-portion curves differ from each other when laser polarization is paralleled to the different optical axis of Yb-doped double tungstates[
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-switched output spectrum of your regenerative amplifier supports a sub-160 fs pulse amplification. Thus, pulses with energies of as much as two mJ and duration below 200 fs is usually acquired utilizing larger-top quality dichroic mirrors plus a broader-spectrum laser seed. This regenerative amplifier functions as a very good pre-amplifier for even further laser amplification.
Determine four Beam radius variation on the two crystals whilst changing the focal length of the thermal lensing effect.
Assembling tungsten oxide hydrate nanocrystal colloids formed by laser ablation in liquid into quickly-response electrochromic films.