Hartwig U, Peithmann K, Woike Th, Buse K
Institute of Physics, Wegelerstraße 8, D-53115 Bonn, Germany.
J Phys Condens Matter. 2006 Sep 20;18(37):L447-50. doi: 10.1088/0953-8984/18/37/L01. Epub 2006 Aug 24.
A method is presented to acquire the absorption cross sections of dopants in photorefractive lithium niobate crystals utilizing doubly doped samples. The absorption cross section of one dopant must be well known. By illumination with ultraviolet light, electrons are transferred from one centre to the other. From the changes of the absorption spectra, the absorption cross section of the centre under investigation is deduced. For a wavelength of λ = 577 nm the absorption cross section of Mn(3+) is determined by this method to be σ(Mn(3+),577 nm)(o) = (9.2 ± 1.3) × 10(-19) cm(2) for ordinarily polarized light. The described method can be adapted to other dopants and host materials.
提出了一种利用双掺杂样品获取光折变铌酸锂晶体中掺杂剂吸收截面的方法。其中一种掺杂剂的吸收截面必须是已知的。通过用紫外光照射，电子从一个中心转移到另一个中心。根据吸收光谱的变化，推导出所研究中心的吸收截面。对于波长λ = 577 nm，用该方法确定Mn(3+)对于寻常偏振光的吸收截面为σ(Mn(3+),577 nm)(o) = (9.2 ± 1.3) × 10(-19) cm(2)。所描述的方法可适用于其他掺杂剂和基质材料。
