Beam coupling and decoupling in degenerate two-wave mixing in a reflection geometry with photorefractive Bi2GeO20 crystals

1984 ◽  
Vol 16 (5) ◽  
pp. 399-404 ◽  
Author(s):  
Y. H. Ja
Keyword(s):  
Wave Mixing ◽  
Beam Coupling ◽  
Two Wave Mixing ◽  
Reflection Geometry

BEAM COUPLING CHARACTERISTICS IN NEMATIC LIQUID CRYSTAL DOPED WITH SILVER NANOPARTICLES

2008 ◽  
Vol 17 (04) ◽  
pp. 377-385 ◽  
Author(s):  
YONG-YUAN JIANG ◽  
JING LI ◽  
LIN-YI HUANG
Keyword(s):  
Image Processing ◽  
Silver Nanoparticles ◽  
Photorefractive Effect ◽  
The Self ◽  
Wave Mixing ◽  
Signal Ratio ◽  
Beam Coupling ◽  
Two Wave Mixing ◽  
Pump Signal ◽  
Coupling Characteristics

The orientational photorefractive effect was observed in the nematic liquid crystals E7 doped with silver nanoparticles. Both the self-diffraction and beam-coupling effects were studied in a two-wave-mixing experiment with an applied external DC field. The dependence of diffraction efficiency on the applied voltage, pump power, pump/signal ratio and grating constant were studied. Experimental results indicate that the optical non-linearity of NLCs can be enhanced significantly by doping silver nanoparticles. Further experiments demonstrate that the holographic grating formed in the sample can be switched on and off by the external DC field. PR two-beam coupling experiment was also performed in the Ag-doped NLCs cell. These results are of benefit to the applications of PR NLCs in holography and image processing.

Enhancement of the signal-to-background ratio in photorefractive two-wave mixing by mutually incoherent two-beam coupling

1994 ◽  
Vol 19 (14) ◽  
pp. 1070 ◽  
Author(s):  
S. Breugnot ◽  
M. Defour ◽  
D. Dolfi ◽  
H. Rajbenbach ◽  
J.-P. Huignard
Keyword(s):  
Wave Mixing ◽  
Background Ratio ◽  
Beam Coupling ◽  
Two Wave Mixing
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