Optical: systems and elements – Optical modulator – Light wave temporal modulation
Patent
1993-02-11
1994-02-15
Moskowitz, Nelson
Optical: systems and elements
Optical modulator
Light wave temporal modulation
359276, 359300, 372 21, 385 5, 385122, G02B 514, G02B 523, G03H 102
Patent
active
052872130
ABSTRACT:
The invention relates to a photorefractive device made of single crystal of which the chemical composition substantially is Ba.sub.1-x Sr.sub.x TiO.sub.3 (0.01<x<0.1 BST) The method for manufacturing said device comprises: growing BST single crystal by Czochralski technique; annealing said crystal in oxidizing atmosphere; machining said crystal into cuboid with polished surfaces; poling said cuboid mechanically and electrically into single-domain state. Said device may ba a piece of said single-domain crystal, or an optoelectronic assembly including at least one of said crystal as the core part. Performances of said device are similar to the one made of BaTiO.sub.3. A reflectivity as high as 52% has been reached using said device as a self-pumped phase conjugator. Compared to BaTiO.sub.3, the method for manufacturing BST crystal according to the invention has advantages such as shorter typical growth period of 3-4 days, simpler requirement for equipment and technique, higher yield, and easier to obtain crystal cuboid with larger dimensions.
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Gao Xiancheng
Guo Xibin
Huang Yihao
Li Gansheng
Lu Jian
Fujian Institute of Research on the Structure of Matter, Chinese
Moskowitz Nelson
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