5 Simple Statements About KGW Crystal Explained
5 Simple Statements About KGW Crystal Explained
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Figure 7 reveals the calculated dispersion payment outcome. The compressed pulse duration is all over 185 fs when the period of input pulses is a hundred and fifty fs. The discrepancy involving them are going to be substantially lowered with a longer pulse input for the reason that uncompensated superior-purchase dispersion matters significantly less for for a longer period pulses. This configuration was utilized to present the compressibility of our amplified pulses with the preliminary stage of our whole program. Down the road we'd undertake a grating-pair compressor for high-quality compensation for high-purchase dispersion.
In distinction, the seed laser is often amplified to about 1 mJ under the orthogonal orientation configuration.
Amplified pulses by having an Power previously mentioned two.five mJ can be anticipated by making use of a better pump ability towards the regenerative amplifier and which makes it do the job at the saturation level. The laser fluence of ~one J/cm2 on the dichroic mirrors is believed for being under the problems threshold of superior-good quality dielectric-coated mirrors.
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Comparison of spectral Electricity densities of supercontinua developed during the ailments of exceptional pumping inside the investigated resources.
Though BGO and LT generated the narrowest SC spectra (a little fewer than one.five optical octaves), they may be seen as quite interesting nonlinear elements for broadband SC generation with pumping at for a longer time laser wavelengths. Owing to its big nonlinearity, BGO exhibited the lowest SC technology threshold (78 nJ) Amongst the investigated elements, and that is twenty five % lessen than in KGW and will be regarded as excellent nonlinear substance for incredibly small-threshold SC technology. The noticed steady and sturdy destruction-free of charge general performance of BGO and GGG at 200 kHz pulse repetition price implies that these nonlinear supplies have a potential for SC era at even higher, MHz, repetition charges. Furthermore, these components offer SC radiation with an outstanding list of parameters that happen to be essential for apps in superior speed spectroscopy and imaging that use bulk-generated SC, see e.g.seventeen,18,19,twenty.
To start with, since the filament-induced luminescence originates from simultaneous absorption of numerous photons, whose whole Electrical power exceeds the bandgap energy of material, it provides straightforward separation of excitation and emission wavelengths and provides really robust sign Even with staying emitted around the whole stable angle. The position of the filament monitor Within the crystal might be easily modified in a very preferred way by various the pump pulse Strength, While the intensity clamping in a light filament tremendously lowers the risk of optical destruction. These characteristics might be valuable for acquiring more information regarding crystal homogeneity and reveal the existence and distribution of various dopants inside the sample.
The Martinez stretcher stretched the seed pulses to ~250 ps with 1600 grooves/mm grating. The enter on the stretcher (incident angle: 52°) Which from the compressor incident for the grating have been through the similar aspect; that's why, a slight angular tuning on the click here grating may very well be designed to get the very best compression consequence. In the compressor, the input angle around the grating and the distance involving the translation stage (S1) as well as transmission grating (TG) had been made to compensate with the stretcher dispersion and all dispersion launched through the materials.
-switched output spectrum from the regenerative amplifier supports a sub-a hundred and sixty fs pulse amplification. For that reason, pulses with energies of up to two mJ and duration underneath 200 fs is often obtained working with larger-high-quality dichroic mirrors as well as a broader-spectrum laser seed. This regenerative amplifier works as a superb pre-amplifier for even more laser amplification.
Determine 4 Beam radius variation on the two crystals when altering the focal length on the thermal lensing outcome.
Equally energies are marked because of the dashed strains and their values are labeled within the plots. The similar characteristics ended up also noticed in KGW and YAG crystals, whose spectral broadening dynamics are revealed for just a comparison in Fig. four.