Highly-deuterated potassium dihydrogen phosphate (DKDP) crystals were grown rapidly from point seeds under high supersaturation in a temperature range of 40-60 o C. The growth rate was about 1-2 order of magnitude higher than that of the traditional temperature reduction method. It was found that highly pure raw materials, overheating at high temperature, ultrafine filtration and supersaturation stability were needed to keep the solution from spontaneous nucleation at high overcooling. The effect of growth conditions on pyramid faces was different from that of prismatic faces. The tetragonal to monoclinic phase solubility transition scarcely occurred in our experiments even though the overcooling of monoclinic phase was as high as 10 o C in some cases.
The origin of three kinds of scatter centers in KDP and DKDP crystals and their relations were investigated. The results have shown that solid inclusions will form liquid and gas inclusions in KDP (DKDP) crystals. The effect of scatter centers on Laser Damage Threshold of the crystals is not same because their sizes are different.
Key words 12%-DKDP, wideband second-harmonic generation, Raman shift, damage threshold, deuterium content.K(D 0.12 H 0.88 ) 2 PO 4 crystals were chosen to be used for quadratic nonlinear medium of wideband frequency doubling at 1 μm. A key limitation on this application is that little information can be found in the previous reports. In this work, growth as well as structural and optical properties of this crystal were investigated in detail. Experimental results in comparison with KDP indicate that lattice parameter along a-axis changes much more than lattice parameter c and infra-red absorption edge shift by 0.08 μm accompanied with increasing of transmittance in the whole region. With the introduction of deuterium atom, peak of ν 1 (PO4) shifts to lower wave number and transverse stimulated Raman scattering was effectively suppressed. Extra-ordinary and ordinary indices were also measured as function of wavelength. Good crystalline perfection and great performance of damage threshold also indicate that 12%-DKDP is an appropriate choice in the application of wideband frequency doubling at 1 μm.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.