The Ultimate Guide To KGW Crystal
The Ultimate Guide To KGW Crystal
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Though ytterbium-doped laser get media normally exhibit a little quantum defect, ytterbium-doped tungstates make it possible for for specifically small values. By way of example, a 1030-nm Yb:YAG laser would Typically be pumped all-around 940 nm, Whilst Yb:KGW or Yb:KYW might be most successfully pumped about 981 nm.
The achieve bandwidth e.g. of Yb:KGW and Yb:KYW is incredibly huge in comparison with that of Yb:YAG. This allows for huge wavelength tunability and for Considerably shorter pulse durations from mode-locked lasers. Values perfectly underneath one hundred fs happen to be obtained with passive method locking.
In conclusion, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are effective nonlinear supplies for broadband SC generation inside the around-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 developed two octave-spanning SC spectra, which Examine to SC spectra made in YAG. These supplies show really comparable performances to YAG also in terms of threshold and best pump pulse energies for SC generation. However, for what problems the likelihood to operate at high laser pulse repetition price, YSO, LSO and LYSO exhibit tough operation only at 10 kHz and immediately degrade (within a few minutes) at twenty kHz. Moreover the somewhat small SC era threshold (169 nJ), GGG shown superb general performance attributes in the limited-wave infrared Using the optimal pump pulse Electricity of 464 nJ, which can be two periods reduce than in YAG: the biggest pink-shifted spectral broadening and the very best spectral Electrical power density, outperforming KGW and YAG crystals in that facet.
], but it might insert much more Price to this component. The intra-cavity spectral obtain curve may be modulated by inserting an etalon that minimizes the actual acquire on the wavelength with the utmost achieve issue[
Prior to the event of Nd:YAG, Nd3+:CaWO4 was a very important unusual-earth-doped laser gain medium. It had been in fact Utilized in the first continually functioning crystal laser.
Nevertheless, after Nd3+:YAG turned commercially available, the interest in CaWO4 dropped sharply. In later yrs, certain other tungstate crystals started to draw in loads of consideration.
The merged acquire is complex and click here will be measured beneath distinctive pumping situations due to quasi-three-level procedure behavior with the Yb-doped gain medium. The blueshift, with a single peak from 1037 nm beneath the similar crystal placement orientation to 1035 nm underneath the orthogonal crystal placement orientation, could outcome through the reabsorption losses at a protracted wavelength during the crystal where the laser polarization is parallel to its Nm -axis, creating the acquire at 1035 nm larger than that at 1037 nm less than orthogonal orientation.
Thermal outcomes are significantly more compact in KGW. This together with the large destruction threshold make the crystal a superb prospect for energy scaling. Comparing Ba(NO3)2 and KGW for Raman application Ba(NO3)two are simpler in the event of ns pulses and KGW �?in the event of ps pulses.
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While BGO, GGG, YSO, LSO and LYSO once in a while serve as laser hosts37, These are mostly discovered as productive scintillators, whose scintillation Attributes are researched pretty well38. Nonetheless, the nonlinear optical Attributes of these crystals and so their likely to function nonlinear resources for SC technology especially, and any other experiments regarding nonlinear propagation of intensive femtosecond laser pulses, continue to be quite improperly examined. To this point, GGG, LT23,twenty five and YSO24 were only sketchily tested for SC generation with Ti:sapphire laser pumping, nevertheless, to the top of our expertise, none of the investigated elements ended up examined with Yb-laser pumping, specifically for what problems their effectiveness at pretty significant (tens to many kHz) pulse repetition charges.
The Yb:KGW laser system has a quasi-a few-degree behavior. The online obtain from the Yb:KGW crystal was not superior: various tens of roundtrips have been needed to amplify the nanojoule seed to the millijoule stage. Thus, the gain-narrowing influence was inevitable in Yb:KGW regenerative amplifiers.
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