ISSN:
1432-0630
Keywords:
78.20
;
77.50
;
71.55
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
Abstract A spontaneous decrease of photorefraction (quasi-breakdown) has been studied in LiNbO3−Fe (0.1 wt%) crystals. It is shown that the quasi-breakdown effect depends on the crystal environment (air, argon) and is absent in a liquid dielectric medium. Quasibreakdown can be avoided reducing the diameter of the light beam from a He−Ne laser. The critical value of birefringence change for quasi-breakdown decreases with growing temperature. The quasi-breakdown effect is also observable after illumination, in the dark. It is shown that quasi-breakdown can be explained by the recombination of light-induced space charge carriers at the surface or in the environment (air, argon) near the crystal surface. The erasure of photorefraction with quasi-breakdown is performed under under uniform illumination of the crystal with visible light.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00899694
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