公开(公告)号：EP1433022A2

公开(公告)日：2004-06-30

申请号：EP02765070.4

申请日：2002-10-02

申请人： Qinetiq Limited

发明人： MASON, Paul David,Qinetiq Limited ,  ORCHARD, David Arthur,Qinetiq Limited ,  TERRY, Jonathan Andrew Craig,Qinetiq Limited

IPC分类号： G02F1/355 ,  G02F1/133

CPC分类号： G02F1/3558 ,  G02F1/3555 ,  G02F2001/3548

摘要： A non-linear optical device such as a frequency changer, parametric amplifier or mixer comprises a stack of grating layers (1, 2, 3 )of non-linear optical material. Each grating layer comprises at least one grating (5) and is bonded in spaced relation to adjacent grating layers (4), preferably by a glass consisting essentially of germanium, arsenic, selenium and a relatively high proportion of tellurium. As described, the gratings (5) in a layer are spaced and formed by periodic electrical poling. The periodicity in adjacent layers may be the same or different. The layers may be of material useful in the infra-red. The layers may be formed of GaAs, ZnSe, ZnGeP2, lithium niobate, potassium, titanyl phosphate of rubidium titanyl arsenate.