Getting My KGW Crystal To Work
Getting My KGW Crystal To Work
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Whilst ytterbium-doped laser gain media generally show a little quantum defect, ytterbium-doped tungstates let for particularly little values. For example, a 1030-nm Yb:YAG laser would Ordinarily be pumped about 940 nm, While Yb:KGW or Yb:KYW could be most efficiently pumped about 981 nm.
The acquire bandwidth e.g. of Yb:KGW and Yb:KYW is extremely significant compared with that of Yb:YAG. This permits for extensive wavelength tunability and for Considerably shorter pulse durations from mode-locked lasers. Values properly beneath one hundred fs are attained with passive method locking.
In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear supplies for broadband SC era from the close to-infrared and shorter-wave infrared spectral ranges, when pumped by one hundred eighty fs essential harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO created two octave-spanning SC spectra, which compare to SC spectra developed in YAG. These products exhibit rather comparable performances to YAG also concerning threshold and ideal pump pulse energies for SC technology. On the other hand, for what concerns the chance to work at high laser pulse repetition charge, YSO, LSO and LYSO present resilient Procedure only at ten kHz and immediately degrade (within a few minutes) at twenty kHz. Besides the reasonably small SC technology threshold (169 nJ), GGG demonstrated exceptional general performance traits inside the quick-wave infrared Along with the exceptional pump pulse Electrical power of 464 nJ, that is two moments decreased than in YAG: the most important pink-shifted spectral broadening and the best spectral Electrical power density, outperforming KGW and YAG crystals in that aspect.
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]. Etalon insertion would lead to supplemental decline, on the other hand, time-to-time optimization would introduce the chance of component destruction and instability to your technique. A nonlinear regenerative amplifier could directly produce pulses by using a duration as little as ninety seven fs and also a spectral bandwidth of 19 nm[
The opposite was put with its Np -axis parallel With all the s-polarized way. A comparison was made amongst a configuration While using the crystals put in exactly the same orientation (
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The particular spectra had been reconstructed by correcting the measured spectra by having an account with the filter transmission capabilities and for the sensitivity features in the spectrometers at the info publish-processing phase. The spectral dynamics in Each and every sample was calculated by good tuning the pump pulse Electricity with a computer-managed attenuator that was check here integrated during the laser method. Thermal Electricity meter EM (Ophir 3A-PF-twelve) was accustomed to measure the SC Electricity which was thereafter used to compute the spectral Electrical power density from the SC radiation. The many measurements were carried out with no translation of your sample with respect into the pump beam.
The 2-pump laser could present approximately one hundred twenty W electrical power. Approximately sixty% of the maximum pump electrical power was used inside our experiment contemplating the small overall performance with the dichroic mirrors. Under this twin-crystal configuration, our cavity supports a 100 W pump power input, as talked over in Part 2.2. Large-high quality dichroic mirrors might be utilised Sooner or later, and laser pulses will likely be stretched to an extended pulse duration.
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Determine 4 Beam radius variation on the two crystals although modifying the focal size from the thermal lensing impact.
]. The twin-crystal configuration lowers the thermal load on Just about every crystal whilst retaining a superior gain, and facilitates the payment of each one’s thermal lensing effect. Hence, the laser cavity can get the job done with a considerable balance range more than the thermal lensing result variation.