An Unbiased View of KGW Crystal
An Unbiased View of KGW Crystal
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When ytterbium-doped laser acquire media usually exhibit a little quantum defect, ytterbium-doped tungstates permit for notably little values. Such as, a 1030-nm Yb:YAG laser would Typically be pumped all over 940 nm, Whilst Yb:KGW or Yb:KYW may very well be most proficiently pumped around 981 nm.
Sooner or later, an investigation to the spectral acquire curve of Yb:KGW in the main amplifier might be executed under cryogenic temperature evolution from 77 K to three hundred K. The working temperature will be controlled to realize broader acquire bandwidth and less change with the central wavelength of the main amplifier.
Therefore You can find tiny independence for optimizing the dispersion compensation effect. Sub-200 fs pulses can be envisioned that has a broader bandwidth seed input. Due to the dual-crystal configuration, the laser cavity delivers a close to diffraction minimal laser beam with M
-switched manner. The bandwidth from the orthogonal orientation was Evidently much broader. The calculated Fourier transform limited pulse length was as shorter as sub-160 fs. Beneath the configuration where by The 2 crystals ended up positioned in precisely the same orientation, Along with the seed enter, the amplified pulse bandwidth was only three nm with 180 μJ Power when it broke the dichroic mirrors.
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Another was placed with its Np -axis parallel With all the s-polarized direction. A comparison was made involving a configuration Together with the crystals placed in the same orientation (
The merged obtain is complicated and will be measured underneath diverse pumping conditions due to the quasi-a few-amount method behavior with the Yb-doped gain medium. The blueshift, with a single peak from 1037 nm beneath the exact crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could outcome from your reabsorption losses at a long wavelength in the crystal exactly where the laser polarization is parallel to its Nm -axis, producing the achieve at 1035 nm increased than that at 1037 nm underneath orthogonal orientation.
Check with RP Photonics for just KGW Crystal about any guidance about tungstate lasers, which include femtosecond lasers and substantial-electrical power lasers.
The 2-pump laser could present around 120 W ability. Somewhere around 60% of the most pump electric power was applied within our experiment considering the reduced general performance in the dichroic mirrors. Underneath this twin-crystal configuration, our cavity supports a a hundred W pump energy enter, as talked about in Portion 2.2. Higher-high-quality dichroic mirrors is going to be made use of Later on, and laser pulses might be stretched to an extended pulse period.
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A multi-move primary amplifier will further more Raise the Vitality to above forty mJ. We will utilize cryogenically cooled Yb:KGW technological know-how to restrain the thermal outcome. Two levels of compression will probably be utilised after amplification. The primary phase will involve a common Treacy-kind compressor, and could compress the heartbeat length to down below three hundred fs having an effectiveness of close to 70%. The 2nd phase will involve a fuel-crammed multi-move mobile[
Figure 4 Beam radius variation on The 2 crystals while changing the focal duration of your thermal lensing outcome.
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