| 发明名称 | Method and device for one-shot measurement of the transient birefringence induced by a perturbation lying within the terahertz frequency range | ||
| 摘要 | The present invention relates to a method and a device for direct, non-deformed one-shot measurement of the transient birefringence induced in an optical medium by a perturbation lying within the terahertz frequency range. The aim of the present invention is to alleviate the drawbacks of the prior art by providing a one-shot measurement method and a one-shot measurement device, these being based on the spectral encoding/decoding principle, which are compatible with all short pulse (UV-NIR) laser sources. In this regard, the invention provides a one-shot method for measuring the transient birefringence induced in an optical medium (12) by at least one terahertz perturbation (6), the method including a step of transmitting and spectrally encoding a pulsed optical signal (2). The encoding step, which includes the generation of a supercontinuum (3), is furthermore combined with a step of decoding the polarization ellipticity of the supercontinuum, induced by the perturbation (6) of the medium (12), by decomposing the electric field of the supercontinuum in two polarization directions and simultaneously measuring the intensities Is and Ip of the two components. | ||
| 申请公布号 | US8847164(B2) | 申请公布日期 | 2014.09.30 |
| 申请号 | US200812808597 | 申请日期 | 2008.12.18 |
| 申请人 | Centre National de la Recherche Scientifique and Universite Paris SUD 11 | 发明人 | De Waele Vincent;Schmidhammer Ulrich |
| 分类号 | G01J5/02;G01N21/35;G01N21/23;G01N21/17 | 主分类号 | G01J5/02 |
| 代理机构 | Blank Rome LLP | 代理人 | Blank Rome LLP |
| 主权项 | 1. Method for the one-shot measurement of the transient birefringence induced in an optical medium (12) by at least one terahertz perturbation (6), the method comprising a step of emission and spectral coding of a pulsed optical signal (2), characterised in that the coding step, which comprises the generation of a supercontinuum (3), is combined with a step of decoding the polarisation ellipticity of the supercontinuum induced by the perturbation (6) of the medium (12), by decomposition of the electrical field of the supercontinuum in two polarisation directions and simultaneous measurement of the intensities Is and Ip of the two components, the one-shot measurement consisting of encoding the temporal profile of the terahertz perturbation on the spectral profile of a single pulse of the supercontinuum. | ||
| 地址 | Paris FR | ||