KGW Crystal Things To Know Before You Buy
KGW Crystal Things To Know Before You Buy
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The acquire bandwidth e.g. of Yb:KGW and Yb:KYW is incredibly massive when compared with that of Yb:YAG. This enables for vast wavelength tunability and for Substantially shorter pulse durations from method-locked lasers. Values well down below one hundred fs have already been accomplished with passive manner locking.
In summary, we shown that undoped scintillator crystals: BGO, GGG, YSO, LSO and LYSO are successful nonlinear products for broadband SC technology in the close to-infrared and brief-wave infrared spectral ranges, when pumped by 180 fs fundamental harmonic pulses from an amplified Yb:KGW laser. YSO, LSO and LYSO made two octave-spanning SC spectra, which Evaluate to SC spectra developed in YAG. These materials exhibit fairly similar performances to YAG also regarding threshold and best pump pulse energies for SC era. Even so, for what worries the possibility to work at significant laser pulse repetition price, YSO, LSO and LYSO exhibit resilient operation only at 10 kHz and immediately degrade (in a few minutes) at 20 kHz. Moreover the relatively reduced SC era threshold (169 nJ), GGG shown fantastic general performance characteristics during the limited-wave infrared While using the ideal pump pulse Vitality of 464 nJ, which is two times decrease than in YAG: the biggest purple-shifted spectral broadening and the best spectral Vitality density, outperforming KGW and YAG crystals in that facet.
-switched method. The bandwidth inside the orthogonal orientation was Obviously Significantly broader. The calculated Fourier change limited pulse duration was as short as sub-160 fs. Underneath the configuration where The 2 crystals were being positioned in the exact same orientation, Along with the seed input, the amplified pulse bandwidth was only three nm with a hundred and eighty μJ Strength when it broke the dichroic mirrors.
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In the future, We'll adopt a laser seed which has a broader spectral bandwidth and implement an acousto-optical programmable dispersive filter to modulate the seed’s spectrum for making full use with the get bandwidth of our regenerative amplifier.
The combined attain is complex and should be measured beneath various pumping ailments due to the quasi-3-level procedure habits of your Yb-doped attain medium. The blueshift, with 1 peak from 1037 nm beneath the same crystal placement orientation to 1035 nm under the orthogonal crystal placement orientation, could end result in the reabsorption losses at a protracted wavelength while in the crystal exactly where the laser polarization is parallel to its Nm -axis, building the gain at 1035 nm increased than that at 1037 nm less than orthogonal orientation.
While BGO and LT made the narrowest SC spectra (somewhat lower than one.5 optical octaves), they may be viewed as really attractive nonlinear components for broadband SC generation with pumping at for a longer time laser wavelengths. Owing to its get more info big nonlinearity, BGO exhibited the lowest SC generation threshold (seventy eight nJ) Amongst the investigated components, which happens to be twenty five % decrease than in KGW and could be regarded as fantastic nonlinear material for incredibly very low-threshold SC technology. The noticed secure and durable damage-free of charge effectiveness of BGO and GGG at two hundred kHz pulse repetition level suggests that these nonlinear materials have a potential for SC era at even increased, MHz, repetition charges. Additionally, these components present SC radiation with a wonderful list of parameters which might be important for purposes in substantial pace spectroscopy and imaging that make use of bulk-produced SC, see e.g.17,18,19,20.
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-switched output spectrum with the regenerative amplifier supports a sub-one hundred sixty fs pulse amplification. Thus, pulses with energies of approximately 2 mJ and length under 200 fs is often acquired making use of higher-excellent dichroic mirrors along with a broader-spectrum laser seed. This regenerative amplifier is effective as a superb pre-amplifier for further laser amplification.
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