Shine a helium‐neon laser at a crystal of barium titanate, and at first the beam merely passes through the crystal. After a few seconds, however, the incident beam begins to scatter into a broad fan of light. After a few more seconds, a weak beam of light emerges from the crystal, traveling back exactly along the direction of the incident beam. As the laser continues to illuminate the crystal, the fan of scattered light disappears and the backscattered beam grows in strength, until it has stolen over half the power of the incident beam.
REFERENCES
1.
See, for example, P. Günter, J.‐P. Huignard, eds., Photorefractive Materials and Applications, volumes 1 and 2, Springer‐Verlag, Heidelberg (1988).
T. J.
Hall
, R.
Jaura
, L. M.
Connors
, P. D.
Foote
, Prog. Quant. Electron.
10
, 77
(1985
).M.
Cronin‐Golomb
, B.
Fischer
, J. O.
White
, A.
Yariv
, IEEE J. Quant. Electron.
QE‐20
, 12
(1984
).R. A. Fisher, ed., Optical Phase Conjugation, Academic, New York (1983).
2.
3.
4.
G. C.
Valley
, A. L.
Smirl
, M. B.
Klein
, K.
Bohnert
, T. F.
Boggess
, Opt. Lett.
11
, 647
(1986
).5.
J.‐M. C.
Jonathan
, R. W.
Hellwarth
, G.
Roosen
, IEEE J. Quant. Electron.
22
, 1936
(1986
).6.
7.
S.
Weiss
, S.
Sternklar
, B.
Fischer
, Opt. Lett.
12
, 114
(1987
).8.
9.
J. Feinberg, D. Z. Anderson, IEEE J. Quant. Electron. (to be published March 1989), and numerous references therein.
10.
This content is only available via PDF.
© 1988 American Institute of Physics.
1988
American Institute of Physics
You do not currently have access to this content.
