Nonvolatile two-color holographic recording in nondoped near-stoichiometric lithium tantalate crystals with continuous-wave lasers

Liu, Youwen; Kitamura, Kenji; Takekawa, Shunji; Nakamura, Masaru; Furukawa, Yasunori; Hatano, Hideki
June 2003
Applied Physics Letters;6/16/2003, Vol. 82 Issue 24, p4218
Academic Journal
(Nonvolatile holograms have been recorded in nondoped near-stoichiometric LiTaO[SUB3] crystals by use of a near infrared (IR) laser for writing and a ultraviolet beam as a gating source. This material exhibits good overall two-color holographic recording characteristics including a high sensitivity of 0.086 cm/J with a gating intensity of 1 W/cm[SUP2] at 350 nm, a large refractive index change of as much as 1×10[SUP-4], a high resistance to IR erasure, and a long hologram lifetime of five years. The sensitivity can be further enhanced using writing and gating beams of a shorter wavelength without sacrificing readout nonvolatility.


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