Open AccessANOMALIES OF LiNbO3 CRYSTAL IN CONOSCOPIC INTERF-ERENCE PATTERN AND REFRACTIVE INDEX BETWEEN ROOM TEMPERATURE AND 130℃
Author(s) -
Xu Ziran,
Shen Hui-Min,
Xian Wang,
Yening Wang
Publication year - 1984
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.33.1192
Subject(s) - refractive index , materials science , uniaxial crystal , crystal (programming language) , electric field , ion , optics , doping , interference (communication) , condensed matter physics , displacement (psychology) , optical axis , physics , optoelectronics , programming language , computer science , psychology , channel (broadcasting) , electrical engineering , quantum mechanics , psychotherapist , lens (geology) , engineering
Conoscopic interference pattern in pure and doped LiNbO3 (LN) has been investigated with the light propagated along z direction. Anomalous change of birefrigence is observed at about 45 ℃ as well as 75 ℃ in pure LN. The crystal changes from uniaxial crystal to biaxial crystal near these two temperatures. Similar phenomena also occur in doped LN, but the temperature ranges of the anomalies are widened. The index of refraction n0 and ne were both measured. Abrupt changes are also discovered at about 45℃ and 75℃ . The behavior of conoscopic interference at 75℃ is very similar to that of the electrooptic effect with the electric field being applied along x direction of LN at room temperature. This suggests that the anomalous change at 75℃ in LN is caused by internal electric field of about 105V/m resulting from the displacement of ions along x direction in LN.