Ultrasonic generation via direct interaction between photons and phonons in anharmonic lattice of ionic crystals

作     者：OU Fa (Department of Applied Physics, South China University of Technology Guangzhou 510641) WU Fugen HE Minggao (Physics Department, Guangdong University of Technology Guangzhou 510090) LIU Cuihong (Physics Department, Guangzhou Teachers’College Guangzh 

出 版 物：《Chinese Journal of Acoustics》 (声学学报（英文版）)

年 卷 期：2000年第19卷第2期

页      面：182-191页

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

基　　金：This work is supported by the National Nature Science Foundation of China!(No. 69678003) 

主　　题：Ultrasonic generation via direct interaction between photons and phonons in anharmonic lattice of ionic crystals mode 

摘      要：A theory of ultrasonic generation via direct interaction of transverse optic (TO) phonons with photons in anharmonic lattice of ionic crystals is presented. There are two methods of supplying light energy for the excitation of TO lattice wave as a high frequency ultrasound: (A) incident light comes from the source outside the cavity? fulfilled with ionic crystal medium, (B) photon mode of the cavity possesses the gain of amplification by stimulated radiation of active atoms doping in the medium. More attention is drawn to the case (B). The working system of case (B), as a mixture of lasing action and ultrasonic generation, has the threshold phenomena like usual laser. And the linear stability analysis shows that the nonlineax phonon-photon coupling and the interaction among phonons themselves, both of which reflect the anharmonicity of lattice vibration, are necessary to the stable ultrasonic output. So this laser-ultrasonic generation mixture would be also a measure to investigate the lattice-dynamic nonlinearity and correlated electromagnetic properties of ionic crystals.