The 2-Minute Rule for KGW Crystal
The 2-Minute Rule for KGW Crystal
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The thermal conductivity of prevalent double tungstates is in the get to 3–4 W/(K m) �?which is not lousy when compared with other laser crystals (While many moments less than for YAG), and pretty massive as opposed With all the thermal conductivity of regular Eyeglasses.
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At the same time, a shorter laser wavelength can be attained; it is achievable to operate that has a quantum defect effectively below one%. Like a consequence, the heat technology might be so little this partly compensates the reduced thermal conductivity.
-switched method. The bandwidth from the orthogonal orientation was Plainly Substantially broader. The calculated Fourier renovate minimal pulse length was as small as sub-a hundred and sixty fs. Beneath the configuration in which the two crystals were being put in a similar orientation, Along with the seed input, the amplified pulse bandwidth was only 3 nm with 180 μJ Electrical power when it broke the dichroic mirrors.
The comparison with glasses is suitable since the significant acquire bandwidth allows e.g. tungstate femtosecond lasers and tunable lasers to contend with glass lasers.
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Lastly, we investigated the long-expression performances of SC generation in crystal samples less than exceptional pumping situations at better laser repetition charges. In doing this, the crystal samples weren't translated and held in the stationary position with respect to your pump beam during the complete measurement. The examples illustrating robust lengthy-term performances of SC technology in KGW and YAG crystals at higher laser repetition prices may be observed in get more info other places. More specifically, secure effectiveness of KGW crystal at two MHz pulse repetition fee underneath quite identical pump beam concentrating geometry was documented recently30, whereas YAG crystal shown secure functionality for many several hours at two hundred kHz pulse repetition amount In spite of pretty limited concentrating of your pump beam (NA=0.085)32. The very long-term performance exams in LSO, LYSO and YSO discovered gradual narrowing from the SC spectra to the lengthy-wavelength facet that occurred just after a certain exposure time and could be attributed to your optical degradation of these elements. As an example, in LSO, the onset of spectral narrowing was noticed immediately after (sim twenty) minutes in a laser repetition level of ten kHz, when at a laser repetition fee of twenty kHz, steady SC generation overall performance was noticed just for roughly two min.
]. This process was depending on the fact that the spectral emission cross-section curves differ from one another when laser polarization is paralleled to the various optical axis of Yb-doped double tungstates[
The pink-shifted Section of the SC spectrum in BGO has the lowest spectral energy density, that is 1–two orders of magnitude decrease than in the rest of the products. On the other hand, pretty very low energy threshold of SC technology, in addition to reduced best pump energy in BGO, ought to be identified. The believed spectral Electrical power densities manufactured in LSO and LYSO are rather just like YAG all over the important A part of the SC spectrum. Quite possibly the most intriguing locating in that regard is GGG crystal, which, Irrespective of really reasonable blue-shifted spectral broadening, makes the most important spectral crimson-change and the very best spectral Power density within the 1600�?000 nm array, which is nearly an order of magnitude bigger than that developed in YAG.
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Figure 8 Intra-cavity pulse amplification system monitored by an oscilloscope. The pulse underwent an unsaturated amplification due to the mirror problems limitation.
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