Abstract

Holograms have been recorded in congruent LiTaO3:Fe with continuous-wave laser light by use of a two-step process. Blue gating light λ=488 nm sensitizes the crystals for holographic recording with red light λ=660 nm of a diode laser. Refractive-index changes of as much as 1.0×10-5 are achieved for intensities of the red light of 1 W/cm2. The saturation values are proportional to the intensity of the writing light. Nondestructive readout with red light is possible, and the holograms remain erasable for blue light.

© 1999 Optical Society of America

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