Fascination About KGW Crystal
Fascination About KGW Crystal
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]. Due to the short storage time, Ti:sapphire is often pumped by frequency-doubled Nd:YAG or Nd:glass good-state lasers, which ends up in a cumbersome and sophisticated technique with substantial Price. When compared with conventional CPA laser units, the OPCPA process can get hold of a shorter pulse length and the next peak energy.
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We utilized a transmission grating (TG) to be a dispersive ingredient inside our stretcher and compressor. A compact configuration was adopted, where by the stretcher and the compressor shared one particular grating just like that in Ref.
In summary, we demonstrated that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear components for broadband SC technology while in the close to-infrared and quick-wave infrared spectral ranges, when pumped by 180 fs elementary harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO generated two octave-spanning SC spectra, which Look at to SC spectra created in YAG. These materials exhibit pretty comparable performances to YAG also when it comes to threshold and ideal pump pulse energies for SC generation. Nonetheless, for what fears the chance to function at higher laser pulse repetition fee, YSO, LSO and LYSO exhibit resilient Procedure only at 10 kHz and promptly degrade (inside of a few minutes) at twenty kHz. Apart from the relatively lower SC generation threshold (169 nJ), GGG demonstrated fantastic overall performance characteristics from the quick-wave infrared Together with the exceptional pump pulse Strength of 464 nJ, and that is two moments decreased than in YAG: the largest purple-shifted spectral broadening and the very best spectral Power density, outperforming KGW and YAG crystals in that factor.
], but it might insert a lot more Price tag to this component. The intra-cavity spectral achieve curve could possibly be modulated by inserting an etalon that minimizes the particular obtain within the wavelength with the maximum obtain variable[
The measured Minimize-off wavelengths on the short-wavelength side are in line with the final pattern of blue-shifted spectral broadening on the bandgap of nonlinear product. Many of the nonlinear resources made reasonable purple-shifted spectral broadenings below circumstances of optimal pump pulse energies, with the largest purple-change exceeding 2000 nm measured in GGG crystal. Our results unveiled that GGG and BGO (which also experienced the bottom supercontinuum generation threshold) offer resilient, optical damage-free of charge effectiveness in a laser repetition charge of 200 kHz, suggesting that these elements are great solutions to YAG and KGW for reduced threshold, significant typical ability supercontinuum generation from the near- and shorter-wave infrared spectral ranges. We also demonstrated that scintillating Homes of bulk products might be easily researched while in the filamentation regime, through multiphoton excitation applying in the vicinity of-infrared femtosecond laser pulses.
One other was put with its Np -axis parallel Together with the s-polarized way. A comparison was created in between a configuration Using the crystals placed in a similar orientation (
KGW (potassium gadolinium tungstate) is often a crystal that is often utilised being a Raman crystal in Raman spectroscopy. It is just a colorless, clear crystal that features a higher Raman scattering efficiency and a solid Raman spectrum, read more which makes it well suited for a range of Raman applications.
We approach to boost the pulse Vitality to above 40 mJ in two-phase multi-pass amplifiers, akin to a get aspect of 20. In Each individual amplifier, we will even undertake two cascaded crystals placed less than orthogonal orientation to reduce the thermal load on Every crystal and compensate for that get-narrowing result.
For starters, For the reason that filament-induced luminescence originates from simultaneous absorption of many photons, whose complete Electrical power exceeds the bandgap Electricity of material, it provides straightforward separation of excitation and emission wavelengths and provides extremely solid signal despite staying emitted in excess of your entire sound angle. The situation from the filament track In the crystal might be quickly adjusted inside a wished-for way by various the pump pulse Strength, whereas the depth clamping in a lightweight filament greatly cuts down the risk of optical damage. These features could be valuable for acquiring extra details about crystal homogeneity and expose the existence and distribution of various dopants while in the sample.
While BGO, GGG, YSO, LSO and LYSO once in a while serve as laser hosts37, They're primarily discovered as successful scintillators, whose scintillation Houses are analyzed quite well38. Having said that, the nonlinear optical Qualities of these crystals and so their possible to function nonlinear components for SC technology specifically, and any other experiments regarding nonlinear propagation of powerful femtosecond laser pulses, remain extremely improperly examined. Up to now, GGG, LT23,25 and YSO24 were being only sketchily examined for SC era with Ti:sapphire laser pumping, even so, to the most effective of our information, none of the investigated materials had been examined with Yb-laser pumping, specifically for what concerns their general performance at very higher (tens to many kHz) pulse repetition fees.
A multi-pass most important amplifier will even further Improve the Electricity to previously mentioned forty mJ. We are going to apply cryogenically cooled Yb:KGW technological know-how to restrain the thermal impact. Two levels of compression will probably be utilized following amplification. The 1st phase includes a standard Treacy-type compressor, and could compress the heart beat period to down below 300 fs with an effectiveness of somewhere around 70%. The second phase includes a fuel-filled multi-pass mobile[
Determine 8 Intra-cavity pulse amplification approach monitored by an oscilloscope. The heart beat underwent an unsaturated amplification as a result of mirror destruction limitation.
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