The Single Best Strategy To Use For KGW Crystal
The Single Best Strategy To Use For KGW Crystal
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Later on, an investigation to the spectral achieve curve of Yb:KGW in the most crucial amplifier will be carried out less than cryogenic temperature evolution from 77 K to 300 K. The Doing work temperature will be controlled to understand broader get bandwidth and less shift within the central wavelength of the main amplifier.
The crimson-shifted Section of the SC is of useful significance, especially for what fears the functionality of broadly tunable optical parametric amplifiers pumped by the fundamental harmonics of Yb lasers. The dearth of seed photons in the very long-wavelength area on the SC spectrum restrictions the amplification efficiency and ends in pulse-to-pulse Electrical power fluctuations across the degeneracy area in the optical parametric amplifier. This component is quantified in Fig. 6a by plotting the SC spectra concerning spectral Power density, which was believed by measuring the Electricity from the axial part of SC radiation (which can be the only virtually useful Portion of SC emission). KGW crystal generates the best spectral Electricity density during the 1200�?450 nm variety, as mentioned within a recent study30.
In contrast, the seed laser can be amplified to in excess of 1 mJ under the orthogonal orientation configuration.
Amplified pulses by having an Power higher than 2.5 mJ might be predicted by applying an increased pump energy to your regenerative amplifier and which makes it do the job in the saturation level. The laser fluence of ~1 J/cm2 over the dichroic mirrors is thought to be below the damage threshold of higher-high quality dielectric-coated mirrors.
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Last but not least, we investigated the long-term performances of SC era in crystal website samples underneath optimal pumping disorders at better laser repetition prices. In doing this, the crystal samples were not translated and stored inside of a stationary situation with respect for the pump beam throughout the entire measurement. The examples illustrating strong extensive-phrase performances of SC generation in KGW and YAG crystals at high laser repetition premiums might be identified somewhere else. Much more especially, steady efficiency of KGW crystal at two MHz pulse repetition price below extremely very similar pump beam concentrating geometry was described recently30, whereas YAG crystal demonstrated stable overall performance for various several hours at two hundred kHz pulse repetition fee even with incredibly restricted focusing of the pump beam (NA=0.085)32. The prolonged-phrase general performance checks in LSO, LYSO and YSO unveiled gradual narrowing of the SC spectra to the lengthy-wavelength aspect that occurred immediately after a particular publicity time and could be attributed for the optical degradation of such supplies. As an example, in LSO, the onset of spectral narrowing was observed following (sim twenty) minutes at a laser repetition charge of ten kHz, while in a laser repetition level of twenty kHz, secure SC generation general performance was observed just for about 2 min.
Thus, with a further enhancement in our regenerative amplifier, 2 mJ compressed pulses might be predicted, devoid of detrimental any part within our compressor.
The pink-shifted Section of the SC spectrum in BGO has the lowest spectral Power density, that's one–2 orders of magnitude reduced than in the remainder of the supplies. Even so, extremely very low energy threshold of SC generation, along with minimal ideal pump Strength in BGO, need to be identified. The believed spectral Electricity densities produced in LSO and LYSO are fairly much like YAG through the entire significant A part of the SC spectrum. Probably the most fascinating locating in that regard is GGG crystal, which, Inspite of pretty moderate blue-shifted spectral broadening, creates the most important spectral red-shift and the very best spectral Strength density while in the 1600�?000 nm range, which is almost an order of magnitude increased than that produced in YAG.
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Tungstates have a tendency to obtain higher Raman coefficients (�?Raman scattering). Thus, they can make significant Raman gain at moderate optical intensities. It is possible to make use of the laser crystal alone as a Raman converter.
Figure four Beam radius variation on The 2 crystals whilst modifying the focal length with the thermal lensing outcome.
]. The twin-crystal configuration lowers the thermal load on Each individual crystal though keeping a significant obtain, and facilitates the payment of every one’s thermal lensing influence. Hence, the laser cavity can operate with a considerable balance selection above the thermal lensing outcome variation.