It had been demonstrated that, by advantage of the very low dispersion from the group velocity, the KDP crystal has some strengths over silica: a bigger pulse compression coefficient, especially at a little value of the В -integral ( B = five, �? nine), decreased complete values of chirped mirror dispersion, as well as a likelihood to control the magnitude of nonlinearity and dispersion by altering crystal orientation.
Thus, the harm mechanism is incredibly intricate, and it's urgent to find out the laser induced damage system of KDP-household crystals. During this paper, the cooperated investigation of Shanghai Institute of Optics and Mechanics with Fujian Institute of Exploration about the Structure of Make any difference, Shandong University and other crystal investigate institutes is reviewed. The laser induced injury Attributes of KDP and DKDP crystals applied as optical switching, frequency doubling and frequency mixing optical elements have been investigated. The optimization of crystal progress approach and also the control of essential components were being guided and the prevailing difficulties and options were being prospected. The exploration has reference worth for the development of superior performance KDP-family members crystals as well as their rational software in superior-energy laser systems.
The regularities of laser-induced destruction are examined for LiNbO3 and KDP single crystals. It can be shown that The form of injury in the dielectric crystals depends on the elastic symmetry of crystal as well as propagation route of laser beam. In the event the beam propagates alongside the optic axis of Those people crystals, the figures of laser injury are 6-issue stars for LiNbO3 and 4-level kinds for KDP crystals.
Further we see hurt as a result of Flat-In-Time (Suit) pulses has distinct pulse length and fluence dependence than Gaussian pulses. We exhibit that a simple thermal diffusion model can account for noticed dissimilarities in destruction densities as a result of square and Gaussian temporally shaped pulses of equal fluence. Also, we clearly show the crucial laser parameter governing dimension of the majority hurt web sites would be the amount of time the pulse stays higher than a particular intensity. Different dependences of injury density and harm site dimensions on laser parameters suggest unique absorption mechanisms early and late while in the harming pulse.
New plan of the petawatt laser dependant on nondegenerate parametric amplification of chirped pulses in DKDP crystals
Thus, an accurate measurement in the diploma of deuteration in DKDP crystal is incredibly important for its programs in superior-energy laser devices.
The transformation from your metastable HTP to tetragonal composition in KH2PO4 and RbH2PO4 under the cost-free environment can be accounted for as a hydrolytic degradation or depolymerization. From this interpretation, it really is instructed which the nomenclature superior-temperature period changeover (HTPT) all around Tp ought to be replaced by that onset of partial polymerization at reaction web-sites dispersed about the area of solids.
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G. M. Loiacono et al. claimed the variation while in the ferroelectric transition temperature with deuteration in 1974, which was Practically dependent linearly on its deuteration level45. Yaksin et al. introduced that Raman scattering spectra can be accustomed to evaluate the deuteration degree of DKDP crystals46. Huser et al. demonstrated which the Raman change of the principle PO4 vibration peak assorted linearly With all the deuteration level47. Li et al. proposed a new strategy to measure the deuterium written content of DKDP crystals, which largely used thermo-gravimetric apparatus to weigh the Preliminary DKDP crystal sample and solutions of thermal decomposition48.
So this PPC typically use KDP as its electro-optic crystal, as a consequence of its high half-wave
Both equally spectral methods could possibly be used to ascertain the deuterium content material of DKDP crystals with Resolution deuteration stage fewer than ninety two%, while IR spectroscopy needs to be far more ideal to measure more highly deuterated DKDP crystals.
789 �?16.53x. Meanwhile, The soundness of FHG was considerably enhanced, along with the angular selection of effectiveness balance was increased to four.four instances in utmost. This function not just systematically demonstrates the FHG qualities of KDP-loved ones crystals, which gives an excellent reference to the deep ultraviolet laser generation, but also provides a completely new technique to evaluate The essential parameters of nonlinear optical products.
The polarized Raman spectra of deuterated potassium dihydrogen phosphate crystals with different deuterium concentrations are calculated. With all the expanding deuterium concentration, the Raman peaks which happen to be assigned as The interior vibrations of the (H/D)2PO−4 anion change to reduce wavenumbers. This purple-change contributes towards the lessen within the more info bonding power with the P—O bond due to the substitution of deuterium for hydrogen.