• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Current developments in lens design and optical engineering XVII >Studying the back-scattering of light for the development of acousto-optical filter with an improved spectral resolution
【24h】

Studying the back-scattering of light for the development of acousto-optical filter with an improved spectral resolution

机译：研究光的反向散射以开发具有改善的光谱分辨率的声光滤波器

获取原文
获取原文并翻译 | 示例
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We consider the collinear backward light scattering as one of potential physical mechanisms for creating an advanced collinear acousto-optical filter with significantly improved spectral resolution. Within co-directional crystalline collinear acousto-optical filters, the resolution is inversely proportional to the material's birefringence, which is ～0.1 in the best case of LiNbO_3-crystal. For the backward light scattering this parameter is replaced by the twice refractive index, so that the gain achieves > 45 times in LiNbO_3-crystal. Thus, one can expect the resolution ～0.002 A instead of the value ～0.1 -0.2 A recently obtained by us experimentally for co-directional geometry in that crystal. Moreover, the collinear backward light scattering can be implemented in an extended amount of available materials. However, the main limitation for applying the phenomenon is the acoustic attenuation in ultra-high frequency range peculiar to the materials for acousto-optical filters. Linear acoustic attenuation reduces the length of acousto-optical interaction and limits the spectral resolution. At an initial stage, our studies are concentrated on physical aspects of this phenomenon as well as on possibilities of its application to creating the acousto-optical filters of a high resolution. In particular, the frequency band-shapes of the scattered light intensity exhibit a tendency to specific acousto-optical nonlinearity, i.e. to more and more rectangular profile as the acoustic power density grows. Results of this analysis confirm the above-noted estimations for a triplet of trigonal acousto-optical crystals, having possibly lower acoustic attenuation.
机译：我们将共线向后光散射视为创建具有显着提高的光谱分辨率的高级共线声光滤波器的潜在物理机制之一。在同向晶体共线声光滤波器中，分辨率与材料的双折射成反比，在LiNbO_3晶体的最佳情况下，其双折射为〜0.1。对于向后的光散射，此参数将替换为两倍的折射率，以便在LiNbO_3晶体中增益达到> 45倍。因此，人们可以期望分辨率为〜0.002 A，而不是我们最近通过实验获得的晶体中同向几何的分辨率为〜0.1 -0.2A。而且，共线后向光散射可以用大量可用材料来实现。然而，应用该现象的主要限制是声光滤波器材料特有的超高频范围内的声衰减。线性声衰减会缩短声光相互作用的长度并限制频谱分辨率。在最初阶段，我们的研究集中在这种现象的物理方面，以及将其应用于创建高分辨率声光滤波器的可能性。特别地，散射光强度的频带形状呈现出特定的声光非线性的趋势，即随着声功率密度的增长而具有越来越多的矩形轮廓。分析结果证实了上述对三方声光晶体的估计，可能具有较低的声衰减。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号