光子学报 ›› 2019, Vol. 48 ›› Issue (2): 219002-0219002.doi: 10.3788/gzxb20194802.0219002

• 非线性光学 • 上一篇    下一篇

具有中心对称结构的3 m点群晶体中紫外三次谐波的产生

石梦静1,2, 李仁富2, 李丙轩2, 刘华刚2, 林文硕1, 潘佳1, 张戈2, 叶宁2   

  1. 1. 福建工程学院 数理学院, 福州 350108;
    2. 中国科学院福建物质结构研究所 光电材料化学与物理重点实验室, 福州 350002
  • 收稿日期:2018-09-10 出版日期:2019-02-25 发布日期:2018-11-14
  • 通讯作者: 叶宁(1972-),男,研究员,博士,主要研究方向为非线性光学及晶体材料.Email:nye@fjirsm.ac.cn
  • 作者简介:石梦静(1983-),女,讲师,博士,主要研究方向为非线性光学.Email:147390594@qq.com
  • 基金资助:

    国家自然科学基金(Nos.51425205,U1605245,51602309,21473096),科技部国家重点研究发展计划(No.2016YFB0402104),中科院战略重点研究项目(No.XDB20000000),福建省教育厅教育科研项目(No.JT180330)

Frequency Conversion for Cubic Harmonic Generation in UV Region through 3 m Point Group Crystals with Centrosymmetric Sturcture

SHI Meng-jing1,2, LI Ren-fu2, LI Bing-xuan2, LIU Hua-gang2, LIN Wen-shuo1, PAN Jia1, ZHANG Ge2, YE Ning2   

  1. 1. Mathematics and Physics Institute, Fujian University of Technology, Fuzhou 350108, China;
    2. Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China
  • Received:2018-09-10 Online:2019-02-25 Published:2018-11-14
  • Supported by:

    National Natural Science Foundation of China (Nos. 51425205, U1605245, 51602309, 21473096), National Key Research and Development Plan of Ministry of Science and Technology (No. 2016YFB0402104), Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDB20000000), Education and Research Project of Fujian Provincial Education Hall (No. JT180330)

摘要:

研究了中心对称晶体中的三阶非线性频率转换,并在这类晶体中实现了紫外激光的有效输出.确定了负单轴晶体的相位匹配角公式及相应的相位匹配角.选择带有离域共轭π键的冰洲石晶体和α-BBO晶体进行实验.以飞秒激光作为基频光,在Ⅱ类相位匹配方式下,利用α-BBO晶体获得了最高单脉冲能量为37.6 μJ的266 nm紫外三次谐波,最高转换效率为2.5%;利用冰洲石晶体获得了最高单脉冲能量为19.3 μJ的266 nm紫外三次谐波,最高转换效率为1.25%.该研究验证了利用中心对称晶体的三阶非线性效应直接获得紫外激光的可行性和获得深紫外激光的可能性,为紫外非线性晶体的探索和深紫外激光的研究提供参考.

关键词: 非线性频率变换, 三次谐波, α-BBO晶体, 紫外激光, 中心对称晶体, 冰洲石

Abstract:

A simple one-step direct third-order nonlinear frequency conversion process in centrosymmetric crystals was studied, and an efficient third-harmonic generation in UV region was obtained. The expressions of phase-matching angles were determined. α-BBO crystal and the calcite crystal which both have the delocalized π bond were selected in our experiment. In type-Ⅱ phase-matched, the maximal output energy was 19.3 μJ and the maximal conversion efficiency was about 1.25% at 266 nm in calcite crystal, while the value was 37.6 μJ and 2.5% in α-BBO crystal. These results indicate the feasibility of direct third-harmonic generation in UV region, the possibility of direct third-harmonic generation in deep-UV region through centrosymmetric crystals, and also demonstrated a succinct and efficient way to generate deep-UV laser and a development direction of nonlinear crystals in UV region.

Key words: Third-harmonic, UV laser, Calcite crystal, Nonlinear frequency conversion, Centrosymmetric crystal, α-BBO crystal

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