Ultra-short laser pulse formation by parametric Raman scattering

通过参量拉曼散射形成超短激光脉冲

• 批准号: 17540378
• 负责人: TAKAHASHI Eiichi
• 金额: $ 2.24万
• 依托单位: National Institute of Advanced Industrial Science and Technology (AIST)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540378/
• 关键词: ultra-short pulse laser; stimulated Raman scattering; parametric scattering; 2波長励起

Recently, the technology behind ultra-short laser pulse generation, based on stimulated Raman scattering, has been receiving a special interest. However, the total number of spectral line generated so far was smaller than the theoretical prediction. This behavior was explained by the laser bean diffraction caused by the intensity dependent Raman conversion.In order to suppress the diffraction effect and increase the number of Raman spectral lines, where these spectral lines have similar intensities, a hollow core fiber was employed. This fiber is the interaction region of the scheme, the high-frequency bi-harmonic excitation of small Stokes shift media. The main of this work was to increase the number of spectral lines, where the intensity of each spectral line is the same, and remove the diffraction effect.Broad Raman-multi-frequency spectra were generated from the resonant two-color excitation of the deuterium molecule rotational Raman transition (J=0>2), using ultraviolet bi-harmonic lasers with a quartz hollow fiber. Fifty pure rotational Raman spectral lines (34 lines that have intensity within 10% of the strongest spectral line) from 230 to 290 nm were generated. This number of Raman spectral lines was agreed with theoretical prediction.

最近，基于受激拉曼散射的超短激光脉冲生成技术受到了特别的关注。然而，迄今为止生成的谱线总数小于理论预测。这种行为可以通过强度相关拉曼转换引起的激光束衍射来解释。为了抑制衍射效应并增加拉曼谱线的数量（其中这些谱线具有相似的强度），采用了空心光纤。该光纤是该方案的相互作用区域，即小斯托克斯位移介质的高频双谐波激励。这项工作的主要内容是增加谱线的数量，并且每条谱线的强度相同，并消除衍射效应。氘的共振双色激发产生宽拉曼多频光谱使用带有石英中空光纤的紫外双谐波激光器进行分子旋转拉曼跃迁 (J=0>2)。生成了 50 条 230 至 290 nm 的纯旋转拉曼光谱线（其中 34 条线的强度在最强光谱线的 10% 以内）。拉曼谱线的数量与理论预测一致。

项目成果

Ultra broadband UV generation by stimulated Raman scattering of two-color KrF laser in deuterium confined in a hollow fiber

通过中空光纤中氘气中双色 KrF 激光的受激拉曼散射产生超宽带紫外线

• 发表时间: 2007
• 期刊: OPTICS EXPRESS 15巻5号
• 作者: 高橋栄一;加藤進;松本裕治;レオニードロゼフ
• 通讯作者: レオニードロゼフ