Indicators on KGW Crystal You Should Know
Indicators on KGW Crystal You Should Know
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The thermal conductivity of frequent double tungstates is of the buy to 3–4 W/(K m) �?which isn't undesirable compared with other laser crystals (While a number of periods less than for YAG), and relatively substantial compared While using the thermal conductivity of standard glasses.
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The red-shifted A part of the SC is of useful value, especially for what issues the performance of broadly tunable optical parametric amplifiers pumped by the elemental harmonics of Yb lasers. The shortage of seed photons inside the very long-wavelength area from the SC spectrum limits the amplification performance and leads to pulse-to-pulse Power fluctuations across the degeneracy location in the optical parametric amplifier. This factor is quantified in Fig. 6a by plotting the SC spectra in terms of spectral Strength density, which was believed by measuring the Electrical power on the axial Component of SC radiation (that's the only real pretty much practical Element of SC emission). KGW crystal creates the very best spectral Electrical power density within the 1200�?450 nm selection, as pointed out in a current study30.
-switched mode. The bandwidth in the orthogonal orientation was clearly Significantly broader. The calculated Fourier remodel restricted pulse duration was as short as sub-160 fs. Beneath the configuration the place The 2 crystals have been positioned in a similar orientation, with the seed input, the amplified pulse bandwidth was only three nm with one hundred eighty μJ Electricity when it broke the dichroic mirrors.
The comparison with glasses is suitable For the reason that large obtain bandwidth lets e.g. tungstate femtosecond lasers and tunable lasers to compete with glass lasers.
In the future, We are going to adopt a laser seed which has a broader spectral bandwidth and use an acousto-optical programmable dispersive filter to modulate the seed’s spectrum to help make total use in the obtain bandwidth of our regenerative amplifier.
Comparison of spectral energy densities of supercontinua produced in the conditions of optimal pumping in the investigated materials.
Thermal consequences are considerably scaled-down in KGW. This along with the significant damage threshold make the crystal a fantastic candidate for electrical power scaling. Evaluating Ba(NO3)two and KGW for Raman software Ba(NO3)2 are more practical in the event of ns pulses and KGW �?in case of ps pulses.
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The Yb:KGW laser method provides a quasi-three-level conduct. The web attain in the Yb:KGW crystal was not significant: several tens of roundtrips had been necessary to amplify the nanojoule seed into a millijoule stage. So, the acquire-narrowing impact was unavoidable in Yb:KGW regenerative amplifiers.
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An illustration of this kind of behaviour is proven in Fig. 7a. The character of spectral variations is highlighted in Fig. 7d, which exhibits how the SC spectrum within the very long-wavelength aspect shrinks significantly, from 1800 nm to 1450 nm, just soon after 8 minutes of exposure time within a stationary sample. LT crystal demonstrated relatively much better lengthy-term overall performance: at pulse repetition rates of as many as one hundred kHz no narrowing on either facet in the SC spectrum was detected. Nonetheless, fast narrowing of the SC spectrum in LT crystal was noticed right after the very first five minutes of operation when the heart beat repetition charge was established website at 200 kHz (knowledge not shown). In distinction to the above elements, BGO and GGG demonstrated great SC generation performances with no spectral changes at a pulse repetition amount of 200 kHz, as attested by the time number of SC spectra in BGO and GGG, revealed in Fig. 7b and c, respectively. Figure 7e and f outline similar styles of SC spectra in the beginning and at the end of one hour-Long lasting measurement in both resources.