Pulsed X-ray induced transient absorption in LiNbO/sub 3/, TiO/sub 2/:LiNbO/sub 2/, and MgO:LiNbO/sub 3/ at 1061 nm

Characteristics of pulsed X-ray induced transient absorption at 1061 mm have been determined for LiNbO/sub 3/, TiO/sub 2/:LiNbO/sub 3/, and MgO:LiNbO/sub 3/. The addition of the dopants TiO/sub 2/ and MgO reduces the induced absorption significantly. The two materials, LiNbO/sub 3/ and TiO/sub 2/:LiNbO/sub 3/, decay with an approximate 1/t/sup 1/4/ time dependence for the time interval 0.01 to 8 ms. After 8 ms, the decay rate for LiNbO/sub 3/ is faster than 1/t/sup 1/4/, and the decay rate for TiO/sub 2/:LiNbO/sub 3/ is slower than that initial rate. A low-intensity absorption which lasts for about 20 /spl mu/s is observed for the MgO:LiNbO/sub 3/. Peak radiation induced absorption coefficients for LiNbO/sub 3/, TiO/sub 2/:LiNbO/sub 3/, and MgO:LiNbO/sub 3/ have been determined.<
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