Laser-induced modification at 355 nm of deuterated potassium dihydrogen phosphate（DKDP） crystals following exposure to nanosecond（ns） and sub-ns laser irradiation is investigated in order to probe the absorption m...Laser-induced modification at 355 nm of deuterated potassium dihydrogen phosphate（DKDP） crystals following exposure to nanosecond（ns） and sub-ns laser irradiation is investigated in order to probe the absorption mechanism in damage initiation. Laser damage resistance is greatly improved by sub-ns laser conditioning,whereas only a little improvement occurred after ns laser conditioning at the same laser fluence. Moreover, scattering and transmittance variations after the two types of laser conditioning indicate similar reduction of linear absorption. However, by contrast, large differences on nonlinear absorption modification are discovered using Z-scan measurement. This characteristic absorption modification by laser irradiation provides evidence that a nonlinear absorption mechanism plays a key role in damage initiation at 355 nm.展开更多
In this paper,a highly deuterated potassium dihydrogen phosphate(DKDP)crystal with sizes up to 318 mm×312 mm×265 mm was grown by the rapid-growth method.The synthesis tank device was specially designed to sy...In this paper,a highly deuterated potassium dihydrogen phosphate(DKDP)crystal with sizes up to 318 mm×312 mm×265 mm was grown by the rapid-growth method.The synthesis tank device was specially designed to synthesize a higher deuterium concentration and high-purity DKDP solution.The deuterium content of the as-grown crystal,which was 97.9%,was determined by two methods,including infrared(IR)spectroscopy and thermo-gravimetric analysis(TGA)measurements.The performances of the 97.9%DKDP crystal,including transmission,absorption coefficient,and laserinduced damage threshold(LIDT)were measured.The results indicate that,in the near-infrared band,the transmission of the 97.9%DKDP crystal is higher than that of KDP and 70%DKDP crystals,and the absorption coefficient is lower.The LIDT of the crystal reached 23.2 J·cm^-2(R-on-1,1064 nm,3 ns),which meets the engineering requirements for use in optical applications.展开更多
The shape and the size of inclusions in DKDP crystal have been observed and measured microscopically. Three kinds of inclusions were found and the components of the inclusions were measured. The formation mechanisms w...The shape and the size of inclusions in DKDP crystal have been observed and measured microscopically. Three kinds of inclusions were found and the components of the inclusions were measured. The formation mechanisms were proposed and discussed.展开更多
基金supported by the National Natural Science Foundation of China(Nos.61405219 and 11304328)
文摘Laser-induced modification at 355 nm of deuterated potassium dihydrogen phosphate（DKDP） crystals following exposure to nanosecond（ns） and sub-ns laser irradiation is investigated in order to probe the absorption mechanism in damage initiation. Laser damage resistance is greatly improved by sub-ns laser conditioning,whereas only a little improvement occurred after ns laser conditioning at the same laser fluence. Moreover, scattering and transmittance variations after the two types of laser conditioning indicate similar reduction of linear absorption. However, by contrast, large differences on nonlinear absorption modification are discovered using Z-scan measurement. This characteristic absorption modification by laser irradiation provides evidence that a nonlinear absorption mechanism plays a key role in damage initiation at 355 nm.
基金supported by the State High Technology Program for Inertial Confinement Fusion
文摘In this paper,a highly deuterated potassium dihydrogen phosphate(DKDP)crystal with sizes up to 318 mm×312 mm×265 mm was grown by the rapid-growth method.The synthesis tank device was specially designed to synthesize a higher deuterium concentration and high-purity DKDP solution.The deuterium content of the as-grown crystal,which was 97.9%,was determined by two methods,including infrared(IR)spectroscopy and thermo-gravimetric analysis(TGA)measurements.The performances of the 97.9%DKDP crystal,including transmission,absorption coefficient,and laserinduced damage threshold(LIDT)were measured.The results indicate that,in the near-infrared band,the transmission of the 97.9%DKDP crystal is higher than that of KDP and 70%DKDP crystals,and the absorption coefficient is lower.The LIDT of the crystal reached 23.2 J·cm^-2(R-on-1,1064 nm,3 ns),which meets the engineering requirements for use in optical applications.
基金This work was supported by the National Natural Science Foundation of China (Grant No. 59823003) the Natural Science Fund of Shandong Province (Grant No. Y2000F09) the Youth Foundation of State High Technology Project for ICF.
文摘The shape and the size of inclusions in DKDP crystal have been observed and measured microscopically. Three kinds of inclusions were found and the components of the inclusions were measured. The formation mechanisms were proposed and discussed.
