Little Known Facts About KGW Crystal.
Little Known Facts About KGW Crystal.
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Whilst ytterbium-doped laser obtain media typically show a small quantum defect, ytterbium-doped tungstates make it possible for for specially little values. One example is, a 1030-nm Yb:YAG laser would normally be pumped all over 940 nm, Whilst Yb:KGW or Yb:KYW could be most proficiently pumped close to 981 nm.
We made use of a transmission grating (TG) as being a dispersive part inside our stretcher and compressor. A compact configuration was adopted, exactly where the stretcher plus the compressor shared 1 grating similar to that in Ref.
In conclusion, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear materials for broadband SC generation within the in close proximity to-infrared and shorter-wave infrared spectral ranges, when pumped by a hundred and eighty fs basic harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO manufactured two octave-spanning SC spectra, which Examine to SC spectra produced in YAG. These products show rather equivalent performances to YAG also concerning threshold and best pump pulse energies for SC generation. Having said that, for what concerns the possibility to operate at substantial laser pulse repetition charge, YSO, LSO and LYSO exhibit strong operation only at 10 kHz and quickly degrade (inside a few minutes) at twenty kHz. Apart from the rather very low SC technology threshold (169 nJ), GGG demonstrated fantastic general performance traits during the brief-wave infrared Together with the ideal pump pulse energy of 464 nJ, which happens to be two situations reduced than in YAG: the biggest purple-shifted spectral broadening and the best spectral energy density, outperforming KGW and YAG crystals in that element.
The monoclinic crystal constructions results in a purely natural birefringence, assisting to avoid thermally induced polarization rotation and depolarization reduction.
Amplified pulses by having an energy earlier mentioned 2.five mJ might be envisioned by applying a better pump electricity to your regenerative amplifier and which makes it do the job at the saturation stage. The laser fluence of ~1 J/cm2 to the dichroic mirrors is believed to become beneath the hurt threshold of significant-good quality dielectric-coated mirrors.
One other was placed with its Np -axis parallel While using the s-polarized route. A comparison was built involving a configuration Along with the crystals put in exactly the same orientation (
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The spectral measurements of filament-induced luminescence recommend that scintillating Qualities of resources can be easily examined making use of femtosecond near-infrared gentle supply via multiphoton excitation within the filamentation regime, which lets uncomplicated separation of excitation and emission wavelengths and very low possibility of optical hurt.
The two-pump laser could offer you as many as one hundred twenty W electricity. Close to sixty% of the most pump electrical power was applied inside our experiment taking into consideration the very low functionality with the dichroic mirrors. Less than this twin-crystal configuration, our cavity supports a 100 W pump power input, as reviewed in Part 2.2. High-excellent dichroic mirrors will likely be made use of in the future, and laser pulses will be stretched to an extended pulse length.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The input of your stretcher (incident angle: 52°) and that on the compressor incident for the grating ended up through the very same side; therefore, a slight angular tuning of the grating can be designed to get the top compression end result. Inside the compressor, the input angle over the grating and the distance in between the interpretation stage (S1) and also the transmission grating (TG) were being built to compensate to the stretcher dispersion and all dispersion introduced because of the components.
-switched output spectrum of your regenerative amplifier supports a sub-a hundred and sixty fs pulse amplification. Consequently, pulses with energies of as much as 2 mJ and length underneath 200 fs could be attained working click here with greater-excellent dichroic mirrors along with a broader-spectrum laser seed. This regenerative amplifier functions as a fantastic pre-amplifier for further more laser amplification.
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The origin of the component's name arises from the English term 'potash,' that means pot ashes, along with the Arabic word qali