Prior get the job done confirmed that the twin-crystal configuration can be employed to compensate with the thermal lensing effect[

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The red-shifted part of the SC is of practical importance, specifically for what fears the overall performance of broadly tunable optical parametric amplifiers pumped by the basic harmonics of Yb lasers. The shortage of seed photons from the very long-wavelength area on the SC spectrum boundaries the amplification efficiency and results in pulse-to-pulse Electrical power fluctuations round the degeneracy area from the optical parametric amplifier. This part is quantified in Fig. 6a by plotting the SC spectra with regard to spectral Strength density, which was estimated by measuring the Electrical power from the axial Portion of SC radiation (and that is the only basically valuable Component of SC emission). KGW crystal makes the very best spectral Vitality density in the 1200�?450 nm selection, as mentioned inside a current study30.

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Right before the event of Nd:YAG, Nd3+:CaWO4 was a very important rare-earth-doped laser gain medium. It was in actual fact Employed in the main consistently running crystal laser.

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Finally, we investigated the extensive-term performances of SC era in crystal samples below best pumping conditions at bigger laser repetition charges. In doing this, the crystal samples were not translated and retained inside of a stationary situation with regard for the pump beam during the total measurement. The illustrations illustrating robust prolonged-term performances of SC era in KGW and YAG crystals at significant laser repetition prices might be observed elsewhere. Much more particularly, steady efficiency of KGW crystal at two MHz pulse repetition amount less than extremely related pump beam concentrating geometry was claimed recently30, Whilst YAG crystal demonstrated stable efficiency for various several hours at 200 kHz pulse repetition charge Despite incredibly tight focusing of the pump beam (NA=0.085)32. The extended-time period effectiveness assessments in LSO, LYSO and YSO unveiled gradual narrowing on the SC spectra on the very long-wavelength facet that happened just after a certain publicity time and will be attributed into the optical degradation of such resources. As an illustration, in LSO, the onset of spectral narrowing was observed immediately after (sim 20) minutes in a laser repetition price of 10 kHz, although in a laser repetition price of 20 kHz, stable SC technology overall performance was observed just for roughly two min.

]. This technique was based on The truth that the spectral emission cross-part curves differ from each other when laser polarization is paralleled to the several optical axis of Yb-doped double tungstates[

We made a diode-pumped Yb:KGW regenerative amplifier as being the entrance finish with the kilohertz terawatt laser system. Wide bandwidth pulses had been attained by making use of dual crystals with different orientations in their optical axes[

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The Yb:KGW laser program contains a quasi-three-level conduct. The web attain of the more info Yb:KGW crystal was not substantial: quite a few tens of roundtrips had been necessary to amplify the nanojoule seed into a millijoule stage. So, the gain-narrowing impact was inevitable in Yb:KGW regenerative amplifiers.

Figure four Beam radius variation on the two crystals while shifting the focal duration in the thermal lensing influence.

The origin in the factor's identify originates from the English phrase 'potash,' this means pot ashes, as well as the Arabic word qali