KGW Crystal Things To Know Before You Buy
KGW Crystal Things To Know Before You Buy
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Although ytterbium-doped laser achieve media typically exhibit a small quantum defect, ytterbium-doped tungstates permit for particularly small values. By way of example, a 1030-nm Yb:YAG laser would Generally be pumped all over 940 nm, While Yb:KGW or Yb:KYW may very well be most effectively pumped about 981 nm.
We made use of a transmission grating (TG) to be a dispersive element in our stretcher and compressor. A compact configuration was adopted, where the stretcher and the compressor shared one grating comparable to that in Ref.
In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear supplies for broadband SC era in the near-infrared and limited-wave infrared spectral ranges, when pumped by a hundred and eighty fs essential harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO generated two octave-spanning SC spectra, which Evaluate to SC spectra manufactured in YAG. These materials exhibit pretty identical performances to YAG also in terms of threshold and exceptional pump pulse energies for SC generation. Nonetheless, for what concerns the possibility to operate at substantial laser pulse repetition amount, YSO, LSO and LYSO demonstrate long lasting operation only at 10 kHz and swiftly degrade (inside of a few minutes) at twenty kHz. Aside from the relatively low SC technology threshold (169 nJ), GGG demonstrated outstanding efficiency characteristics within the limited-wave infrared Together with the optimal pump pulse energy of 464 nJ, and that is two moments lower than in YAG: the biggest pink-shifted spectral broadening and the best spectral energy density, outperforming KGW and YAG crystals in that part.
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For tungstates, the ytterbium doping concentration can be extremely significant devoid of substantial quenching since the replaced ions have an exceedingly identical ion radius, and the inter-ion length is comparatively big.
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Eventually, we investigated the lengthy-expression performances of SC generation in crystal samples beneath exceptional pumping situations at bigger laser repetition costs. In doing so, the crystal samples were not translated and saved inside a stationary situation with respect on the pump beam in the complete measurement. The illustrations illustrating robust extended-time period performances of SC generation in KGW and YAG crystals at substantial laser repetition fees could be uncovered in other places. Additional specifically, stable functionality of KGW crystal at 2 MHz pulse repetition level under quite identical pump beam focusing more info geometry was documented recently30, Whilst YAG crystal shown secure functionality for quite a few hours at two hundred kHz pulse repetition charge Despite having quite limited concentrating with the pump beam (NA=0.085)32. The prolonged-expression efficiency checks in LSO, LYSO and YSO revealed gradual narrowing on the SC spectra about the very long-wavelength facet that happened immediately after a particular publicity time and could be attributed on the optical degradation of those supplies. For instance, in LSO, the onset of spectral narrowing was observed just after (sim twenty) minutes in a laser repetition amount of ten kHz, while in a laser repetition rate of 20 kHz, stable SC generation general performance was observed just for about two min.
The particular spectra have been reconstructed by correcting the measured spectra having an account to the filter transmission functions and with the sensitivity features of the spectrometers at the information publish-processing phase. The spectral dynamics in Each and every sample was measured by high-quality tuning the pump pulse Power with a pc-controlled attenuator which was integrated from the laser method. Thermal Electrical power meter EM (Ophir 3A-PF-12) was utilized to measure the SC Strength which was thereafter used to compute the spectral energy density on the SC radiation. Many of the measurements have been executed without any translation with the sample with regard to the pump beam.
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These elements can be used for frequency conversion in lasers for extending of tuning assortment. SRS in crystals is suitable with recent all-good-condition technology and delivers a quite simple, compact signifies of frequency conversion.
The Yb:KGW laser process has a quasi-3-stage actions. The net obtain of your Yb:KGW crystal was not substantial: numerous tens of roundtrips have been needed to amplify the nanojoule seed to some millijoule stage. So, the achieve-narrowing outcome was inevitable in Yb:KGW regenerative amplifiers.
Figure eight Intra-cavity pulse amplification procedure monitored by an oscilloscope. The heart beat underwent an unsaturated amplification because of the mirror hurt limitation.
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