The Definitive Guide to KGW Crystal
The Definitive Guide to KGW Crystal
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Although ytterbium-doped laser acquire media commonly show a little quantum defect, ytterbium-doped tungstates let for especially smaller values. For example, a 1030-nm Yb:YAG laser would Generally be pumped all-around 940 nm, whereas Yb:KGW or Yb:KYW may very well be most efficiently pumped around 981 nm.
Down the road, an investigation on the spectral acquire curve of Yb:KGW in the principle amplifier will probably be carried out beneath cryogenic temperature evolution from seventy seven K to 300 K. The Functioning temperature might be managed to appreciate broader gain bandwidth and fewer shift in the central wavelength of the main amplifier.
Hence There exists minor independence for optimizing the dispersion compensation outcome. Sub-two hundred fs pulses could be envisioned that has a broader bandwidth seed input. Due to the dual-crystal configuration, the laser cavity delivers a near diffraction limited laser beam with M
-switched method. The bandwidth during the orthogonal orientation was Obviously Significantly broader. The calculated Fourier completely transform minimal pulse period was as short as sub-160 fs. Underneath the configuration where The 2 crystals were being positioned in the exact same orientation, While using the seed enter, the amplified pulse bandwidth was only 3 nm with 180 μJ energy when it broke the dichroic mirrors.
Amplified pulses using an Electrical power above two.five mJ is often envisioned by implementing the next pump energy towards the regenerative amplifier and making it do the job within the saturation amount. The laser fluence of ~one J/cm2 to the dichroic mirrors is thought for being beneath the damage threshold of superior-high quality dielectric-coated mirrors.
Another was placed with its Np -axis parallel Along with the s-polarized path. A comparison was built in between a configuration Along with the crystals placed in the same orientation (
The black line denotes the configuration Together with the crystals positioned in exactly the same orientation, while the purple line is underneath the configuration of crystals placed in orthogonal orientation.
Thermal consequences are drastically lesser in KGW. This combined with the high hurt threshold make the crystal a great candidate for power scaling. Comparing Ba(NO3)two and KGW for Raman software Ba(NO3)two are more effective in case of ns pulses and KGW �?in the event of ps pulses.
The threshold Vitality for SC era (hbox E _ textrm th ) was defined because the pump pulse Power, where by the blue-shifted spectral broadening quickly settles to a certain Lower-off wavelength That continues to be Practically frequent In spite of even further raise on the pump pulse energy. The the best read more possible energy (hbox E _textrm decide ), was described since the pump pulse energy, which creates the largest purple-shifted spectral broadening prior to the onset of periodic modulation from the SC spectrum as a result of filament refocusing.
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A multi-pass main amplifier will further more Increase the Vitality to above forty mJ. We will implement cryogenically cooled Yb:KGW engineering to restrain the thermal result. Two levels of compression will likely be used soon after amplification. The first stage consists of a standard Treacy-variety compressor, and will compress the pulse duration to underneath three hundred fs by having an performance of approximately 70%. The second stage includes a gasoline-crammed multi-pass cell[
Figure 4 Beam radius variation on The 2 crystals whilst modifying the focal size with the thermal lensing outcome.
KGW crystals are utilized as Raman scattering supplies since they have sturdy Raman scattering at a variety of different wavelengths. Every time a laser beam is directed on to the crystal, the photons inside the laser beam interact with the crystal lattice, producing many of the photons to scatter in a distinct path.