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The gain bandwidth e.g. of Yb:KGW and Yb:KYW is quite significant compared with that of Yb:YAG. This allows for broad wavelength tunability and for A great deal shorter pulse durations from method-locked lasers. Values well under a hundred fs have already been attained with passive method locking.

The red-shifted A part of the SC is of sensible worth, specifically for what fears the efficiency of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The lack of seed photons inside the long-wavelength location in the SC spectrum limitations the amplification performance and brings about pulse-to-pulse Electrical power fluctuations across the degeneracy region of the optical parametric amplifier. This factor is quantified in Fig. 6a by plotting the SC spectra with regards to spectral Vitality density, which was approximated by measuring the Electricity with the axial Portion of SC radiation (that's the only real basically valuable Element of SC emission). KGW crystal produces the very best spectral Electricity density within the 1200�?450 nm assortment, as mentioned inside a latest study30.

The monoclinic crystal structures ends in a all-natural birefringence, helping to prevent thermally induced polarization rotation and depolarization reduction.

For tungstates, the ytterbium doping focus can be extremely superior devoid of significant quenching because the replaced ions have an extremely similar ion radius, and also the inter-ion distance is fairly huge.

Later on, We'll adopt a laser seed that has a broader spectral bandwidth and implement an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to create total use of the acquire bandwidth of our regenerative amplifier.

KGW (potassium gadolinium tungstate) is usually a crystal that is usually applied as a Raman crystal in Raman spectroscopy. It's really a colorless, clear crystal that has a significant Raman scattering performance and a robust Raman spectrum, rendering it ideal for A selection of Raman programs.

]. This method was based upon the fact that the spectral emission cross-segment curves vary from each other when laser polarization is paralleled to different optical axis of Yb-doped double tungstates[

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These products can be used for frequency conversion in lasers for extending of tuning vary. SRS in crystals is suitable with present all-good-condition engineering and presents a quite simple, compact implies of frequency conversion.

A multi-move major amplifier will additional Increase the Electricity to over forty mJ. We are going to use cryogenically cooled Yb:KGW engineering to restrain the thermal influence. Two phases of compression will probably be utilized following amplification. The initial stage includes a standard Treacy-type compressor, and will compress the heartbeat duration to underneath three hundred fs using an performance of roughly 70%. The second stage includes a fuel-crammed multi-go mobile[

Determine four Beam radius variation on the two crystals even though changing the focal length in the thermal lensing result.

An illustration of these conduct is demonstrated in Fig. 7a. The character of spectral improvements is highlighted in Fig. 7d, which demonstrates how the SC spectrum around the very long-wavelength aspect shrinks considerably, from 1800 nm to 1450 nm, just after eight minutes of exposure time within a stationary sample. LT crystal shown somewhat improved lengthy-phrase performance: at pulse repetition fees of as much as a hundred kHz no read more narrowing on both facet with the SC spectrum was detected. Having said that, immediate narrowing on the SC spectrum in LT crystal was noticed right after the main 5 minutes of operation when the heart beat repetition charge was set at two hundred kHz (knowledge not proven). In contrast to the above mentioned elements, BGO and GGG demonstrated superb SC technology performances with no spectral changes in a pulse repetition price of two hundred kHz, as attested by the point series of SC spectra in BGO and GGG, demonstrated in Fig. 7b and c, respectively. Figure 7e and file define similar styles of SC spectra at the beginning and at the end of 1 hour-lasting measurement in the two materials.