Nonvolatile holographic storage in photorefractive lithium tantalate crystals with laser pulses

Autor(en): Imbrock, J
Wevering, S
Buse, K
Kratzig, E
Stichwörter: INDUCED CHARGE-TRANSPORT; LINBO3; LITAO3; NIOBATE; Optics
Erscheinungsdatum: 1999
Herausgeber: OPTICAL SOC AMER
Journal: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
Volumen: 16
Ausgabe: 9
Startseite: 1392
Seitenende: 1397
Zusammenfassung: 
Nonvolatile holograms are recorded in photorefractive LiTaO3:Fe with laser pulses by use of two-step excitation. Ultraviolet laser pulses (wavelength lambda = 355 nm) yield a strong increase of absorption las much as 600 m(-1) at lambda = 633 nm) and sensitize the crystals for subsequent infrared (lambda = 1064 nm) holographic recording. Refractive-index changes of as much as 1.6 x 10(-4) are achieved for intensities of the infrared light of 10(11) W/m(2). The saturation values are proportional to the concentration of Fe3+ ions. Nondestructive readout with infrared light is possible, and the holograms remain erasable for ultraviolet light. Typical time constants of recording and erasure are 0.5 mu s for intensities of the ultraviolet light of 1011 W/m2 The results can be explained with a two-level charge-transport model. (C) 1999 Optical Society of America [S0740-3224(99)03509-2].
ISSN: 07403224
DOI: 10.1364/JOSAB.16.001392

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