Tm-Ho: SrGdGa3O7无序激光晶体生长及2μm波段超短脉冲研究

项目名称： Tm-Ho: SrGdGa3O7无序激光晶体生长及2μm波段超短脉冲研究

项目编号： No.51302158

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 一般工业技术

项目作者： 张园园

作者单位： 山东省科学院

项目金额： 25万元

中文摘要： 2μm激光位于人眼安全波段，在大气中传输特性好，可覆盖水分子和CO2分子的吸收带，其超短脉冲在软X射线阿秒脉冲产生、激光雷达、医学治疗等领域具有重要需求。超短脉冲的产生需要超宽光谱，决定于激活离子和基质材料。国内外对2μm超短脉冲研究处于起始阶段。 本项目提出铥（Tm）和钬（Ho）共同掺杂的无序激光晶体-SrGdGa3O7，对其2μm超短脉冲产生进行研究。采用提拉法生长Tm-Ho: SrGdGa3O7晶体，通过对其热学、光谱和激光性能的系统表征，建立浓度-无序度-光学质量-热学-光谱之间的关系，指导完善生长工艺；采用色散补偿技术及相应锁模元件，探索2μm超短脉冲实现的可能性。 本项目的研究可以为2μm超短脉冲激光产生提供新的思考，具有科学意义和实用前景。

中文关键词： 无序晶体；Tm-Ho: SrGdGa3O7；晶体生长；非均匀加宽；

英文摘要： Ultrashort pulse (picosecond and femtosecond) lasers in the 2-μm spectral range will offer new possibilities for coverage of the mid-infrared spectral range with solid state ultrafast laser sources. Eye safe lasers emitting in the 2-μm spectral range have potential applications in the fields of medicine, laser radar and atmosphere monitoring.The development of such mode-locked lasers operating in the 2-μm spectral range based on rare-earth doped fibers and bulk crystals started only recently. The research planned will be focused on development of novel short and ultrashort pulse bulk solid state lasers operating in the 2-μm spectral range based on specially designed Tm and Ho co-doped disordered SrGdGa3O7 crystal. Tm-Ho: SrGdGa3O7 crystal have broader absorption and emission spectra. Strong inhomogeneous broadening of the pumping band improves spectral overlap with the relatively broad emission band of a diode laser (DL). A broad fluorescence linewidth facilitates the production of short, mode-locked pulses. Tm-Ho: SrGdGa3O7 single crystals were grown by the Czochralski method. Characterization on Tm, Ho: SrGdGa3O7 crystal quality, thermal properties，optical properties and laser performance were carried out. The main objective will be to fill the gap in the 2-μm spectral range where short and ultrashort pulse s

英文关键词： Disordered crystal；Tm-Ho: SrGdGa3O7；Crystal growth；Inhomogeneous Broadening；