Abstract

A novel mechanism is used to record photorefractive gratings in dielectric crystals. The photon energy of near-ultraviolet recording beams is larger than the energy gap, and the absorbed photons excite electrons from the valence to the conduction band. These interband photorefractive gratings in undoped KNbO3 show a faster response than gratings recorded in the same material with visible light, i.e., below band-gap excitation. We measured a response time τ = 5 μs for an intensity I = 1 W/cm2 and a refractive-index change of 2 × 10−6. In a transversal readout geometry, large diffraction efficiencies of 60% in 7.5-mm-long crystals are demonstrated. Interband photorefractive gratings are only weakly affected by visible light.

© 1993 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Deep-ultraviolet interband photorefraction in lithium tantalate

Philipp Dittrich, Bozena Koziarska-Glinka, Germano Montemezzani, Peter Günter, Shunji Takekawa, Kenji Kitamura, and Yasunori Furukawa
J. Opt. Soc. Am. B 21(3) 632-639 (2004)

Diffraction from thermally fixed gratings in a photorefractive medium: steady-state and transient analysis

M. Jeganathan and L. Hesselink
J. Opt. Soc. Am. B 11(9) 1791-1799 (1994)

Evolution and propagation of grating envelopes during erasure in bulk photorefractive media

Muthu Jeganathan, Matthew C. Bashaw, and Lambertus Hesselink
J. Opt. Soc. Am. B 12(7) 1370-1383 (1995)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription