An Unbiased View of KGW Crystal
An Unbiased View of KGW Crystal
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Figure 8 Intra-cavity pulse amplification procedure monitored by an oscilloscope. The heart beat underwent an unsaturated amplification as a result of mirror injury limitation.
The pink-shifted Section of the SC is of sensible worth, specifically for what concerns the efficiency of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The dearth of seed photons from the extensive-wavelength location of your SC spectrum boundaries the amplification efficiency and leads to pulse-to-pulse Electricity fluctuations around the degeneracy region in the optical parametric amplifier. This element is quantified in Fig. 6a by plotting the SC spectra regarding spectral Electricity density, which was estimated by measuring the Electrical power with the axial Portion of SC radiation (that is the only real nearly useful Element of SC emission). KGW crystal makes the highest spectral energy density during the 1200�?450 nm array, as pointed out in a very modern study30.
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Right before the development of Nd:YAG, Nd3+:CaWO4 was a very important uncommon-earth-doped laser achieve medium. It had been actually Utilized in the primary consistently running crystal laser.
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KGW (potassium gadolinium tungstate) is actually a crystal that is often used for a Raman crystal in Raman spectroscopy. It is a colorless, clear crystal which has a substantial Raman scattering effectiveness and a robust Raman spectrum, rendering it well suited for a range of Raman apps.
The particular spectra had been reconstructed by correcting the calculated spectra using an account for your filter transmission features and to the sensitivity functions of the spectrometers at the information publish-processing phase. The spectral dynamics in Every single sample was calculated by wonderful tuning the pump pulse Power with a pc-managed attenuator that was built-in in the laser technique. Thermal Power meter EM (Ophir 3A-PF-12) was utilized to measure the SC Strength which was thereafter accustomed to work out the spectral Strength density from the SC radiation. Every one of the measurements have been executed with no translation in the sample with regard for the pump beam.
The 2-pump laser could offer as much as a hundred and twenty W energy. Around 60% of the utmost pump electrical power was utilized within our experiment looking at the very low performance with the dichroic mirrors. Underneath this twin-crystal configuration, our cavity supports a one hundred W pump electricity enter, as talked about in Area 2.2. Higher-top quality dichroic mirrors might be utilised Later on, and laser pulses will likely be stretched to a longer pulse period.
Though BGO, GGG, YSO, LSO and LYSO often serve as laser hosts37, They are really principally recognized as efficient scintillators, whose scintillation Qualities are researched quite well38. Even so, the nonlinear optical Qualities of those crystals and so their potential to serve as nonlinear materials for SC era especially, and every other experiments about nonlinear propagation of intense femtosecond laser pulses, continue being extremely inadequately examined. Up to now, GGG, LT23,twenty five and YSO24 had been only sketchily analyzed for SC technology with Ti:sapphire laser pumping, nonetheless, to the most beneficial of our understanding, none of the investigated elements were examined with Yb-laser pumping, especially for what worries their performance at extremely substantial (tens to many hundreds of kHz) pulse repetition prices.
Tungstates tend to own superior Raman coefficients (�?Raman scattering). As a result, they can create sizeable Raman obtain at reasonable optical intensities. It can be done to use the laser crystal by itself to be a Raman converter.
Determine 4 Beam radius check here variation on The 2 crystals even though modifying the focal duration on the thermal lensing influence.
The two energies are marked via the dashed strains as well as their values are labeled in the plots. The similar options were being also observed in KGW and YAG crystals, whose spectral broadening dynamics are shown for your comparison in Fig. four.