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Figure seven demonstrates the calculated dispersion compensation final result. The compressed pulse duration is all around 185 fs once the period of input pulses is one hundred fifty fs. The discrepancy among them might be noticeably decreased with an extended pulse enter simply because uncompensated significant-order dispersion matters much less for extended pulses. This configuration was utilized to display the compressibility of our amplified pulses on the preliminary section of our complete program. Down the road we might undertake a grating-pair compressor for great payment for high-buy dispersion.

-switched method. The bandwidth during the orthogonal orientation was clearly Significantly broader. The calculated Fourier remodel restricted pulse length was as quick as sub-a hundred and sixty fs. Underneath the configuration exactly where the two crystals were being put in the exact same orientation, While using the seed enter, the amplified pulse bandwidth was only 3 nm with 180 μJ Electrical power when it broke the dichroic mirrors.

The comparison with glasses is suitable For the reason that large obtain bandwidth makes it possible for e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.

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Last but not least, we investigated the very long-expression performances of SC era in crystal samples underneath ideal pumping ailments at increased laser repetition charges. In doing so, the crystal samples were not translated and kept inside of a stationary situation with regard for the pump beam through the overall measurement. The examples illustrating strong lengthy-term performances of SC technology in KGW and YAG crystals at significant laser repetition fees may very well be uncovered somewhere else. More specially, stable general performance of KGW crystal at 2 MHz pulse repetition price underneath really identical pump beam focusing geometry was described recently30, Whilst YAG crystal demonstrated steady performance for many hours at 200 kHz pulse repetition fee Despite having very tight focusing from the pump beam (NA=0.085)32. The extensive-phrase overall performance checks in LSO, LYSO and YSO uncovered gradual narrowing with the SC spectra about the extended-wavelength aspect that transpired following a specific exposure time and will be attributed to the optical degradation of these products. As an illustration, in LSO, the onset of spectral narrowing was observed after (sim twenty) minutes at a laser repetition price of 10 kHz, while in a laser repetition rate of twenty kHz, steady SC technology performance was noticed just for approximately two min.

Therefore, with an extra improvement in our regenerative amplifier, two mJ compressed pulses is usually envisioned, without the need of harming any ingredient inside our compressor.

The brink Electricity for SC generation (hbox E _ textrm th ) was outlined given that the pump pulse Vitality, wherever the blue-shifted spectral broadening quickly settles to a certain Reduce-off wavelength That continues to be Virtually frequent In spite of even more increase from the pump pulse energy. The the best possible Strength (hbox E _textrm opt ), was described as being the pump pulse Vitality, which provides the largest purple-shifted spectral broadening prior to the onset of periodic modulation while in the SC more info spectrum resulting from filament refocusing.

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Tungstates have a tendency to possess high Raman coefficients (�?Raman scattering). For that reason, they're able to deliver important Raman gain at reasonable optical intensities. It can be done to use the laser crystal itself for a Raman converter.

The scattered photons have another wavelength and Power in comparison to the incident photons, which creates a Raman spectrum.

KGW crystals are utilized as Raman scattering products because they have potent Raman scattering in a range of different wavelengths. Whenever a laser beam is directed on to the crystal, the photons from the laser beam communicate with the crystal lattice, causing some of the photons to scatter in a unique route.