Not known Facts About KGW Crystal
Not known Facts About KGW Crystal
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Previous work showed that the dual-crystal configuration can be employed to compensate with the thermal lensing result[
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In its elemental form, potassium has a silvery grey metallic visual appeal, but its compounds (for instance potassium hydroxide) are more frequently Utilized in industrial and chemical purposes.
In distinction, the seed laser may be amplified to around one mJ underneath the orthogonal orientation configuration.
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Various solutions have been adopted to resolve this issue. An acousto-optical programmable dispersive filter can be utilized to modulate the seed’s spectrum to suppress the achieve-narrowing outcome[
Lastly, we investigated the lengthy-time period performances of SC era in crystal samples less than ideal pumping problems at better laser repetition charges. In doing this, the crystal samples were not translated and retained in the stationary posture with respect to the pump beam over the entire measurement. The illustrations illustrating robust extended-expression performances of SC era in KGW and YAG crystals at significant laser repetition fees may be observed elsewhere. More precisely, steady efficiency of KGW crystal at 2 MHz pulse repetition amount less than extremely similar pump beam concentrating geometry was claimed recently30, Whilst YAG crystal shown steady functionality for several several hours at 200 kHz pulse repetition price even with quite tight focusing on the pump beam (NA=0.085)32. The extended-expression performance assessments in LSO, LYSO and YSO revealed gradual narrowing of the SC spectra around the very long-wavelength side that transpired following a specific exposure time and will be attributed towards the optical degradation of those supplies. For instance, in LSO, the onset of spectral narrowing was noticed right after (sim twenty) minutes at a laser repetition fee of ten kHz, whilst at a laser repetition price of 20 kHz, steady SC generation functionality was noticed just for approximately 2 min.
We prepare to boost the pulse Electrical power to above forty mJ in two-phase multi-go amplifiers, akin to a get factor of 20. In Each and every amplifier, we will also undertake two cascaded crystals put less than orthogonal orientation to reduce the thermal load on each crystal and compensate with the attain-narrowing impact.
The threshold Electricity for SC technology (hbox E _ textrm th ) was defined as the pump pulse Electricity, where the blue-shifted spectral broadening rapidly settles to a specific Reduce-off wavelength That is still Nearly continual even with even more improve of the pump pulse Strength. The optimum Power (hbox E _textrm decide ), was outlined as the pump pulse Strength, which generates the most important purple-shifted spectral broadening before the onset of periodic modulation during the SC spectrum resulting from filament refocusing.
While BGO, GGG, YSO, LSO and LYSO often function laser hosts37, They can be mostly discovered as effective scintillators, whose scintillation properties are examined very well38. Having said that, the nonlinear optical Houses of such crystals and so their opportunity to function nonlinear elements for SC era in particular, and every other experiments concerning nonlinear propagation of intense femtosecond laser pulses, remain incredibly poorly examined. To this point, GGG, LT23,twenty five and YSO24 were being only sketchily tested for SC era with Ti:sapphire laser pumping, however, to the top of our expertise, none of the investigated components have been examined with Yb-laser pumping, specifically for what issues their efficiency at extremely high (tens to numerous kHz) pulse repetition premiums.
The Yb:KGW laser system incorporates a quasi-a few-amount habits. The web obtain from the Yb:KGW crystal was not substantial: several tens of roundtrips have been required to amplify the nanojoule seed to some millijoule level. As a result, the acquire-narrowing result was inescapable in Yb:KGW regenerative amplifiers.
The scattered photons have a special wavelength and Strength as opposed to incident photons, which produces a Raman spectrum.
An illustration of this sort of conduct is demonstrated in Fig. 7a. The character of spectral variations is highlighted in Fig. 7d, which exhibits how the SC spectrum to the extensive-wavelength facet shrinks considerably, from 1800 nm to 1450 nm, just right after 8 minutes of publicity time in a stationary sample. LT crystal shown considerably better extended-phrase efficiency: at pulse repetition costs of nearly 100 kHz no narrowing on possibly aspect in the SC spectrum was detected. Even so, speedy narrowing of read more your SC spectrum in LT crystal was noticed following the 1st 5 minutes of operation when the heart beat repetition level was established at 200 kHz (facts not shown). In distinction to the above mentioned products, BGO and GGG shown excellent SC generation performances without any spectral modifications at a pulse repetition charge of two hundred kHz, as attested by the point number of SC spectra in BGO and GGG, revealed in Fig. 7b and c, respectively. Determine 7e and file define identical shapes of SC spectra in the beginning and at the end of one hour-lasting measurement in the two elements.