DKDP Switch Crystal - An Overview
DKDP Switch Crystal - An Overview
Blog Article
We summarize new investigations in the density and morphology of bulk hurt in KDP crystals as being a perform of pulse duration, temporal profile, wavelength, and energy fluence. As Formerly claimed by Runkel et al.1, we also learn that the size of bulk hurt web pages differs approximately linearly with pulse duration for pulses amongst 1 ns and 9 ns. However this trend now not applies at pulse durations underneath 1 ns. Experiments measuring the destruction density and measurement distribution as being a perform of wavelength validate a lot of past is effective which indicated a strong dependence of damage density with wavelength. Having said that, we also see that the scale of injury sites is relatively insensitive to wavelength.
Consequently, the destruction system is rather complicated, and it truly is urgent to grasp the laser induced problems system of KDP-loved ones crystals. In this paper, the cooperated investigation of Shanghai Institute of Optics and Mechanics with Fujian Institute of Investigation about the Composition of Subject, Shandong University along with other crystal analysis institutes is reviewed. The laser induced injury Qualities of KDP and DKDP crystals applied as optical switching, frequency doubling and frequency mixing optical elements were investigated. The optimization of crystal expansion process along with the Charge of important factors had been guided and the present complications and alternatives had been prospected. The investigate has reference value for the event of higher functionality KDP-household crystals and their rational software in high-ability laser methods.
It also hinders identification with the structure on the damage precursors required to finally eradicate the destruction dilemma. It truly is hence very important to create new techniques to expose the optical Qualities from the problems precursors. During this dissertation, the interaction from the harm precursors in KDP/DKDP with laser pulses of variable fluence and frequency is investigated making use of many experimental procedures. A problems testing tactic is applied that takes advantage of the adjust during the problems attributes of the material subsequent publicity to laser pulses by measuring the ensuing density of injury websites. The results advise there are two kinds of precursors, Every single leading to damage initiation in excess of a distinct frequency range. For both equally precursor populations, the pathways bringing about destruction initiation are distinctive than those resulting in conditioning. Additionally, among a person precursor population, you will find multiple pathways bringing about conditioning which have been depending on the pre-exposure frequency and fluence. From these results, a way is made for predicting the harm general performance throughout harmonic conversion in which a number of wavelengths are present. Also, laser pre-irradiation parameters are prescribed for maximizing the conditioning impact.
This Web site uses cookies to deliver some of our products and services as well as for analytics and to supply you a far more personalized practical experience.
99% and 96.07%, respectively. The 0% laser-induced problems threshold of Z-Minimize in 1064 nm was about 40J/cm two , exceeding A lot over the applying need in sure higher electricity laser devices. The polarization condition of laser had tiny impact on the laser-induced destruction qualities of I-type sample. Then the laser-induced problems morphologies of 98% DKDP crystals induced through the 1064 nm and 532 nm lasers had been investigated. The outcomes indicated the "micro-explosion" of various more info kinds of defects in the bulk triggered distinctive damage morphologies, and plenty of cracks in the problems pinpoints presented the frequent orientation with superior regularity in look at with the I-variety stage-match course. Our investigate can offer a reference to the apps of hugely deuterated DKDP crystals in large power laser devices.
Suppression of transverse stimulated Raman scattering with laser-induced destruction array in a large-aperture potassium dihydrogen phosphate crystal
Remarkably-deuterated potassium dihydrogen phosphate (DKDP) crystals were grown promptly from place seeds under significant supersaturation in the temperature array of forty-sixty °C. The growth rate was about 1-2 purchase of magnitude increased than that of the traditional temperature reduction system. It absolutely was found that highly pure Uncooked materials, overheating at substantial temperature, ultrafine filtration and supersaturation balance had been required to preserve the solution from spontaneous nucleation at large overcooling.
KDP-relatives crystals are the one nonlinear optical crystal substance in accordance With all the optical aperture of ICF laser motorists. As KDP-loved ones crystals are grown by aqueous Remedy strategy, the macroscopic inclusions and microscopic lattice defects effortlessly arise in the bulk in the crystals. The large density pinpoints harm phenomenon seems as They can be irradiated through the large electrical power laser. Every one of the laser induced problems Attributes are distinct with the surface harm of crystals grown by other approaches, which can be only limited by optical processing. The laser induced hurt by defects or precursors are associated with the laser wavelengths and also the laser polarization way, and the several samples from similar to-developed single crystal and placed on unique optical functions in ICF laser motorists present various laser induced harm Homes.
solitary manner. It is identified which the harm threshold of KDP single crystal will depend on the laser irradiation path, polarization
G. M. Loiacono et al. noted 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 measure the deuteration degree of DKDP crystals46. Huser et al. shown that the Raman shift of the primary PO4 vibration peak various linearly Together with the deuteration level47. Li et al. proposed a completely new approach to evaluate the deuterium content of DKDP crystals, which mostly applied thermo-gravimetric apparatus to weigh the initial DKDP crystal sample and products of thermal decomposition48.
The angular dependance on the transverse Raman scattering in potassium dihydrogen phosphate (KDP) and its deuterated analogue (DKDP) for the whole array of crystal configurations well suited for laser beam polarization Management has been investigated via experimental and modeling applications. This operate was produced possible by concurrently rotating a spherical sample and also the pump polarization to proficiently measure the angular dependance of the transverse Raman signal in 360°. This novel system, which happens to be relevant for the investigation with the Raman scattering in optically anisotropic products, demonstrates which the spontaneous Raman scattering sign reveals potent angular dependence that is modulated by depolarization and polarization rotation results produced as being the Raman sign traverses the fabric as a consequence of its birefringence.
In nonlinear optics these crystals are most commonly employed as the next, third, and fourth harmonic turbines for Nd:YAG and Nd:YLF lasers.
With this evaluation, we introduce the progress in the growth of large-aperture DKDP crystals plus some aspects of crystal high quality such as resolve of deuterium content material, homogeneity of deuterium distribution, residual strains, nonlinear absorption, and laser-induced hurt resistance for its software in significant electrical power laser technique. Substantial-aperture significant-high-quality DKDP crystal with deuteration volume of 70% continues to be productively grown by the normal process, that may fabricate the big solitary-crystal optics Along with the size exceeding 400 mm. Neutron diffraction technique is definitely an efficient method to investigate the deuterium written content and 3D residual strains in one crystals.
The neutron scattering duration from the deuterium atom is larger sized than that of other atoms in DKDP crystal, so neutron diffraction can be utilized as a successful approach to directly establish the deuterium written content of DKDP crystals50,51.