Near-infrared response of photorefractive crystals (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6:Cu and LiNbO3:Fe

Abstract

Enhancement of the response rate of internal reflection selfpumped phase conjugators with Ce and Mndoped (K0.5Na0.5)0.2(Sr0.75Ba0.25)0.9Nb2O6 crystals using intermittent light Appl. Phys. Lett. 67, 10 (1995); 10.1063/1.115499Contrast reversal of antiparallel domains in Cudoped (Ba0.25Sr0.75)0.9(K0.5Na0.5)0.2Nb2O6 single crystal with synchrotron topographyMaterial response relevant to volume holographic storage for photorefractive crystals ͑K 0.5 Na 0.5 ͒ 0.2 ͑Sr 0.75 Ba 0.25 ͒ 0.9 Nb 2 O 6 :Cu ͑KNSBN:Cu͒ and LiNbO 3 :Fe was studied in the near-infrared region. The dark decay time for KNSBN:Cu was measured to be on the order of 10 6 s. The light-induced erasure time at the 1 mW/cm 2 read beam intensity can be Ͼ1000 h for both KNSBN:Cu and LiNbO 3 :Fe. Read beam diffraction efficiencies of 28.7% for KNSBN:Cu and 50% for LiNbO 3 :Fe were obtained at 706 nm when the refractive index grating was written at 706 nm. The decay rate of the refractive index grating with an extraordinary-wave read beam is about 3.6 times smaller than that with an ordinary-wave read beam for KNSBN:Cu. The results show that near-infrared light can be used to read holograms in the photorefractive volume holographic storage application.