The Greatest Guide To KGW Crystal
The Greatest Guide To KGW Crystal
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Even though ytterbium-doped laser attain media normally exhibit a little quantum defect, ytterbium-doped tungstates permit for especially modest values. For instance, a 1030-nm Yb:YAG laser would Ordinarily be pumped close to 940 nm, While Yb:KGW or Yb:KYW may very well be most proficiently pumped all-around 981 nm.
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In its elemental variety, potassium features a silvery grey metallic look, but its compounds (for example potassium hydroxide) tend to be more commonly Employed in industrial and chemical apps.
Its pump laser requires a brief pulse period, a lower time jitter, and smooth temporal and spatial distributions due to intrinsic instantaneous approach. So, the OPCPA technique is a lot more challenging and costly.
For tungstates, the ytterbium doping concentration can be very high without significant quenching as the replaced ions have an incredibly comparable ion radius, and also the inter-ion length is fairly big.
Later on, We'll adopt a laser seed having a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to produce entire use with the achieve bandwidth of our regenerative amplifier.
Eventually, we investigated the extensive-time period performances of SC technology in crystal samples under optimum pumping conditions at larger laser repetition prices. In doing this, the crystal samples were not translated and held inside a stationary posture with regard towards the pump beam over the whole measurement. The examples illustrating strong very long-term performances of SC generation in KGW and YAG crystals at substantial laser repetition premiums could be observed elsewhere. Far more specially, stable general performance of KGW crystal at 2 MHz pulse repetition rate less than incredibly click here related pump beam focusing geometry was noted recently30, Whilst YAG crystal shown stable performance for quite a few hrs at 200 kHz pulse repetition fee Despite pretty tight concentrating of the pump beam (NA=0.085)32. The very long-term effectiveness checks in LSO, LYSO and YSO uncovered gradual narrowing of your SC spectra to the lengthy-wavelength aspect that transpired just after a particular exposure time and will be attributed for the optical degradation of these resources. As an illustration, in LSO, the onset of spectral narrowing was noticed soon after (sim 20) minutes at a laser repetition level of ten kHz, whilst at a laser repetition price of 20 kHz, secure SC technology efficiency was observed just for approximately 2 min.
Thermal effects are noticeably more compact in KGW. This together with the large destruction threshold make the crystal a superb prospect for electricity scaling. Evaluating Ba(NO3)2 and KGW for Raman application Ba(NO3)two are more practical in the event of ns pulses and KGW �?in case of ps pulses.
The brink Vitality for SC era (hbox E _ textrm th ) was described since the pump pulse Power, where by the blue-shifted spectral broadening speedily settles to a certain Slash-off wavelength That is still Practically constant In spite of further more boost with the pump pulse Power. The the best possible Electricity (hbox E _textrm choose ), was described given that the pump pulse Electrical power, which makes the largest pink-shifted spectral broadening ahead of the onset of periodic modulation from the SC spectrum on account of filament refocusing.
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Determine 4 Beam radius variation on The 2 crystals though altering the focal length from the thermal lensing impact.
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