Ce:Mn:LiNbO_3晶体紫外记录研究

Study of UV Recording in Congruent Ce:Mn:LiNbO_3

采用紫外光作记录光在Ce∶Mn∶LiNbO3晶体中实现非挥发全息记录,灵敏度可达0.0803cm/J,衍射效率(固定)为5.07%,比采用红光为记录光,紫外光为敏化光的非挥发双中心记录方案均提高了50多倍。分析表明,采用紫外光作为记录光,深能级电子被激发比例极大提高,参与光折变过程的电子平均运动周期变短,提高了衍射效率和灵敏度;深浅能级电子光栅的同相位,使得固定空间电荷场变强。文中还研究了退火对记录性能的影响。

Nonvolatile holographic recording is performed with recording UV beams （364 nm） in Ce：Mn：LiNbO3 crystals, both the sensitivity and the fixed diffraction efficiency can be improved more than 50 times of thai in twocenter recording .scheme with recording red beams （633 nm），It is analyzed that in this UV recording system, a larger proportion of the electrons are excited and the average movement cycle of electrons involved in photorefrativc procedure becomes shorter；the deep and shallow center being in phase makes the fixed space-charge field stronger，The effect of annealing also is studied。