| 词条 | Phase conjugation |
| 释义 |
Phase conjugation is a physical transformation of a wave field where the resulting field has a reversed propagation direction but keeps its amplitudes and phases. DescriptionIt is distinguished from Time Reversal Signal Processing by the fact that phase conjugation uses a holographic or parametric pumping whereas time reversal records and re-emits the signal using transducers.[1]
Both techniques allow an amplification of the conjugate wave compared to the incident wave.[1] As in time reversal, the wave re-emitted by a phase conjugation mirror will auto-compensate the phase distortion and auto-focus itself on its initial source, which can be a moving object.[1] Propagation of a time reversal replica demonstrates a remarkable property of phase-conjugated wave fields. Phase conjugation of wave field means the inversion of linear momentum and angular momentum of light.[5] Phase conjugation methods exist in two main domains:
References1. ^1 2 A. P. Brysev et al., Wave phase conjugation of ultrasonic beams, Physics-Uspekhi (1998) [2]2. ^1 A.Yu. Okulov, "Optical and Sound Helical structures in a Mandelstam-Brillouin mirror". JETP Lett, v.88, n.8, pp. 561-566 (2008)] }} See also
1 : Wave mechanics |
| 随便看 |
|
开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。