X-ray Absorption Analysis of KDP Optics

摘要: Abstract Potassium dihydrogen phosphate (KDP) is a non-linear optical material used for laser frequency conversion and switches. Unfortunately, when KDP crystals are coated with porous silica anti-reflection coating (Thomas, Appl. Opt. 1986;25(9):1481) then exposed to ambient humidity, they develop dissolution pits (Wheeler et al., SPIE 1999;3902:451–459; Wheeler Mater. Res. Soc. Conf., San Francisco, 2000). Previous investigations 1999;3902:451–459) have shown that thermal annealing renders optics less susceptible pitting, suggesting modification of surface chemistry has occurred. X-ray absorption was characterize changes in the composition structure as function process parameters. native were also analyzed provide standard basis interpretation. Surface sensitive total electron yield bulk fluorescence from K2p, P2p (L2,3-edge) O1s (K-edge) edges measured at each step. Results indicate 160°C dehydrates resulting metaphosphate K:P:O=1:1:3.