Abstract
Potassium Dihydrogen Phosphate (KDP) crystals have been successfully grown under different conditions such as slow growth rate (2 mm/day), rapid growth rate (15 mm/day), and deuterium (80%) doping (DKDP). The extinction ratio, conductivity, absorption spectrum, laser damage threshold as well as optical scattering particles were fully investigated before and after thermal annealing in air, vacuum, N<sub>2</sub> and H<sub>2</sub>, respectively. The correlations between optical properties and growth conditions were clarified. It was found that the laser damage threshold is proportional to the extinction ratio, optical transmittance, and however inversely proportional to the conductivity of the material. It was firstly convinced that the optical quality can be improved by thermal annealing in vacuum and H<sub>2</sub>, and however no obvious effect in air and N<sub>2</sub>.
Highlights
Potassium Dihydrogen Phosphate (KDP) and deuterium doped KDP (DKDP) crystals have been widely used in optoelectronics, information, and national defense due to the advantages of the rapid growth rate, high laser damage threshold, large electro-optic and nonlinear optical coefficients [1,2]
The optical and electrical properties of (D) KDP crystals could be greatly affected by the growth rate, solution conditions, deuterium concentration and so on [7,8], and study on the correlations between the growth conditions and optical properties may con
All the samples were thermal annealed in air, vacuum, N2 and H2, and the extinction ratio, conductivity, absorption spectrum, laser damage threshold as well as optical scattering particles were measured and compared before and after annealing
Summary
Potassium Dihydrogen Phosphate (KDP) and deuterium doped KDP (DKDP) crystals have been widely used in optoelectronics, information, and national defense due to the advantages of the rapid growth rate, high laser damage threshold, large electro-optic and nonlinear optical coefficients [1,2]. Three growth conditions including traditional growth (1 ~ 5 mm/day), rapid growth ( ≥ 8 mm/day) and deuterium doped KDP(DKDP), as well as five optical parameters including extinction ratio, electrical conductively, transmittance spectra, laser damage threshold and distribution of the optical scattering particles, were taken into consideration[10].
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