Recent Works On Optical Crystals In Shanghai Institute Of Ceramics, Academia Sinica

Hao-Ran Tan; Chong-Fan He

doi:10.1117/12.948125

17 January 1989 Recent Works On Optical Crystals In Shanghai Institute Of Ceramics, Academia Sinica

Hao-Ran Tan, Chong-Fan He

Proceedings Volume 0968, Ceramics and Inorganic Crystals for Optics, Electro-Optics, and Nonlinear Conversion; (1989) https://doi.org/10.1117/12.948125
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

Recent works on bismuth germanate and lithium niobate are described with relation to the behavior of impurity or dopant ions and their effect on optical properties. For bismuth germanate crystals grown by Bridgman method the mean segregation coefficients for several elements were found to be very small as compared with those for Czochralski method. Radiation damage experiments revealed that Pb, Mn, Fe and Co have the most deteriorative effect. Whereas Ni, Ga and Mg affect slightly, and Al, Si, Ca and Cu seem to have no measurable effect on radiation damage of bismuth germanate crystals. For lithium niobate absorption edge of congruent crystals doped with Mg0 shows a minimum at some 5 mol% Mg. This threshold effect of Mg dopant finds its origin in its substitution behavior in host lattice and could be closely related to the occupancy (4.58%) of Nb in Li site in congruent crystal. For the first time the crystal structure of lithium niobate heavily doped with Mg0 was investigated directly, resulting in a best model with all the Mg accommodated in Li sublattice. On the basis of experimental data the substitution behavior of Mg could be summarized as the following: With Mg content below the threshold value, replacement of Nb in Li site by Mg is the dominant process, leading to a shift of absorption edge toward shorter wavelengths. As Mg content reaches the threshold value,most of the Nbin Li site are replaced, resulting in the observed minimum of the absorption edge curve. With further increase of Mg content, the substitution of Li by Mg becomes prevailing, causing a slight counter-shift of the absorption edge.

Citation Download Citation

Hao-Ran Tan and Chong-Fan He "Recent Works On Optical Crystals In Shanghai Institute Of Ceramics, Academia Sinica", Proc. SPIE 0968, Ceramics and Inorganic Crystals for Optics, Electro-Optics, and Nonlinear Conversion, (17 January 1989); https://doi.org/10.1117/12.948125

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available