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SUMMARY:Gamma irradiation effect on optical and laser damage performance o
 f KDP crystals
DTSTART:20160204T231500Z
DTEND:20160204T233000Z
DTSTAMP:20260914T180300Z
UID:indico-contribution-528@events.synchrotron.org.au
DESCRIPTION:Speakers: Wanguo Zheng (Research Center of Laser Fusion\, Chin
 a Academy of Engineering Physics)\, Xiaodong Yuan (Research Center of Lase
 r Fusion\, China Academy of Engineering Physics)\n\nKDP (KH2PO4) is a nonl
 inear transparent dielectric crystalline material used in various laser sy
 stems for harmonic generation. It has been used for inertial confinement f
 usion in the National Ignition Facility\, USA. However\, the physical and 
 chemical properties of the KDP crystals may degrade under γ and neutron r
 adiations. Therefore\, it is important to understand the effects of radiat
 ions on the optical properties especially laser induced damage performance
  during subsequent laser irradiation. \nIn this work\, the effect of Co60 
 gamma-ray irradiation on KDP crystal with the dose in a range from 1 kGy t
 o 100 kGy is investigated using UV-Vis absorption\, fluorescence\, DC elec
 trical conductivity\, positron annihilation lifetime\, and laser induced d
 amage threshold (LIDT). A wide absorption band between 250 and 400 nm appe
 ars after γ-irradiation and its intensity increases with the increasing i
 rradiation dose. The dc electrical conductivity of γ-irradiated KDP cryst
 als increases with the increasing irradiation dose when the dose is less t
 han 10 kGy while it remains constantly with the irradiation dose beyond 10
 0 kGy. The increase of electrical conductivity is associated with the incr
 ease of proton defect concentration in the crystal and the related mechani
 sm is discussed. The positron annihilation lifetime spectroscopy is also u
 sed to reveal the evolution of vacancy-type defects in KDP crystal. The de
 crease of LIDT and size of vacancy-type clusters with the increasing irrad
 iation dose is also investigated.\n\nShort Bio: Wanguo Zheng is the Projec
 t Leader of SG-III laser facility in China. He is also the Deputy Director
  of Research Center for Laser Fusion\, China Academy of Engineering Physic
 s. He received his PhD degree in Optical Engineering at Fudan University. 
 In 2011\, he was awarded The 14th Qiushi Outstanding Young Scientist of Ch
 ina Association for Science and Technology. His research interests focuses
  on optical materials and large-aperture optical components\, laser engine
 ering and high-power laser technology\, and radiation effects of materials
 . He has published more than 100 scientific papers in international peer-r
 eviewed journals.\n\nhttps://events.synchrotron.org.au/event/19/contributi
 ons/528/
RELATED-TO:indico-event-19@events.synchrotron.org.au
URL:https://events.synchrotron.org.au/event/19/contributions/528/
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