Fascination About KGW Crystal
Fascination About KGW Crystal
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Whilst ytterbium-doped laser get media normally exhibit a little quantum defect, ytterbium-doped tungstates enable for notably modest values. Such as, a 1030-nm Yb:YAG laser would Generally be pumped all over 940 nm, whereas Yb:KGW or Yb:KYW may be most competently pumped about 981 nm.
Down the road, an investigation to the spectral acquire curve of Yb:KGW in the main amplifier might be performed underneath cryogenic temperature evolution from 77 K to three hundred K. The Functioning temperature is going to be controlled to appreciate broader acquire bandwidth and fewer shift in the central wavelength of the principle amplifier.
Concurrently, a shorter laser wavelength is often obtained; it is possible to operate that has a quantum defect well beneath 1%. Being a consequence, the warmth generation can be so smaller this partly compensates the lower thermal conductivity.
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The comparison with Eyeglasses is acceptable For the reason that large achieve bandwidth permits e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
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The black line denotes the configuration Together with the crystals positioned in precisely the same orientation, while the red line is under the configuration of crystals placed in orthogonal orientation.
We prepare to spice up the heartbeat Electricity to higher than forty mJ in two-phase multi-go amplifiers, corresponding to a acquire element of 20. In Every amplifier, we can even undertake two cascaded crystals placed less than orthogonal orientation to decrease the thermal load on Each and every crystal and compensate for your acquire-narrowing effect.
The 2-pump laser could provide approximately a hundred and twenty W electricity. Roughly 60% of the utmost pump energy was applied inside our experiment considering the lower effectiveness of your dichroic mirrors. Below this twin-crystal configuration, our cavity supports a one hundred W pump power input, as mentioned in Segment 2.two. Superior-quality dichroic mirrors will probably be applied Sooner or later, and laser pulses will probably be stretched to a longer pulse period.
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The Yb:KGW laser method has a quasi-3-level habits. The net attain in the Yb:KGW crystal was not substantial: several tens of roundtrips were being needed to amplify the nanojoule seed into a millijoule level. Hence, the acquire-narrowing influence was inescapable in Yb:KGW regenerative amplifiers.
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