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首页> 外文会议>Solid state lasers XXIII: technology and devices >Spectroscopy and Mid-IR lasing of Cr~(2+) ions in ZnSe/ZnS crystals under visible excitation
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Spectroscopy and Mid-IR lasing of Cr~(2+) ions in ZnSe/ZnS crystals under visible excitation

机译：可见光激发下ZnSe / ZnS晶体中Cr〜（2+）离子的光谱和中红外激光发射

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摘要

Recent efforts have demonstrated efficient Cr~(2+):Ⅱ-Ⅵ chalcogenide (e.g. ZnSe, ZnS) broadly tunable (1.9-3.3μm) lasers under direct intra-shell Cr~(2+) optical excitation. We report on the spectroscopic study of Cr~(2+):ZnSe/ZnS under visible excitation into the charge transfer band of Cr~(2+) ions. Polycrystalline samples prepared by thermal diffusion method were studied. Middle-infrared (mid-IR) photo-luminescence (PL) of Cr~(2+) ions was compared under continuous wave (CW) direct 1532nm (~5T_2→~5E) excitation and under 532nm excitation into charge transfer band. The quantum yield of CnZnSe mid-IR luminescence under CW green excitation was estimated as close to 100% at room temperature. To estimate Cr excitation rate via charge transfer band under short pulse excitation, mid-IR PL kinetic measurements were performed with the use of 532nm picosecond and nanosecond pumping. Mid-IR PL kinetics of CnZnSe under pulsed green excitation exhibit a relatively slow growth reaching a peak at ～5-10μs for nanosecond and picosecond excitations, respectively, while PL kinetics in Cr:ZnS reveal shorter measured rise time (＜1μs) limited by the response time of the detector. This rise of the PL intensity under 532nm pulsed excitation implies that 5E population continues to grow after the excitation pulse due to slow relaxation processes from higher-lying excited levels of Cr~(2+) to the upper laser level 5E. At the same time for nanosecond excitation the excited level is pumped at a rate faster than it is depleted and, hence, it is reasonable to expect that the population of the 5E level could be inverted. For laser experiments we used 5ns radiation from BBO based optical parametric oscillator tunable over 450-700nm. CnZnSe lasing at 2.5 μm induced by 2+→1+→2+ ionization transitions of chromium under visible excitation was achieved.
机译：最近的研究表明，在直接的壳内Cr〜（2+）光激发下，高效的Cr〜（2 +）：Ⅱ-Ⅵ硫族化物（例如ZnSe，ZnS）可广泛调谐（1.9-3.3μm）激光器。我们报道了在可见光激发下Cr〜（2+）离子的电荷转移带中Cr〜（2 +）：ZnSe / ZnS的光谱研究。研究了通过热扩散法制备的多晶样品。在连续波（CW）直接1532nm（〜5T_2→〜5E）激发和532nm激发下将Cr〜（2+）离子的中红外（mid-IR）光致发光（PL）进行了比较。在室温下，CW绿光激发下CnZnSe中红外发光的量子产率估计接近100％。为了在短脉冲激发下通过电荷转移带估算Cr激发速率，使用532nm皮秒和纳秒泵浦进行了中红外PL动力学测量。脉冲绿色激发下CnZnSe的中红外PL动力学表现出相对缓慢的增长，在纳秒和皮秒激发下分别达到约5-10μs达到峰值，而Cr：ZnS的PL动力学显示较短的测量上升时间（＜1μs）受限制检测器的响应时间。在532nm脉冲激发下PL强度的这种上升表明，由于从较高的激发态Cr〜（2+）到较高的激光能级5E的缓慢弛豫过程，激发脉冲后5E种群继续增长。同时，对于纳秒激发，激发能级的泵浦速度快于其耗尽的速度，因此，可以合理预期5E能级的数量可以反转。对于激光实验，我们使用了基于BBO的光学参量振荡器的5ns辐射，其可调谐范围为450-700nm。在可见光激发下，铬的2 +→1 +→2 +电离跃迁诱导了2.5μm处的CnZnSe激射。

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  • 来源
    《Solid state lasers XXIII: technology and devices》|2014年|89590E.1-89590E.7|共7页
  • 会议地点 San Francisco CA(US)
  • 作者

    J. Peppers; T. Konak; D. V. Martyshkin; V. V. Fedorov; S. B. Mirov;

  • 作者单位

    Center for Optical Sensors and Spectroscopies and the Department of Physics, University of Alabama at Birmingham, CH 310, 1300 University Blvd., Birmingham, AL 35294, USA;

    Center for Optical Sensors and Spectroscopies and the Department of Physics, University of Alabama at Birmingham, CH 310, 1300 University Blvd., Birmingham, AL 35294, USA;

    Center for Optical Sensors and Spectroscopies and the Department of Physics, University of Alabama at Birmingham, CH 310, 1300 University Blvd., Birmingham, AL 35294, USA;

    Center for Optical Sensors and Spectroscopies and the Department of Physics, University of Alabama at Birmingham, CH 310, 1300 University Blvd., Birmingham, AL 35294, USA;

    Center for Optical Sensors and Spectroscopies and the Department of Physics, University of Alabama at Birmingham, CH 310, 1300 University Blvd., Birmingham, AL 35294, USA;

  • 会议组织
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Ⅱ-Ⅵ; transition metal doped chalcogenide; middle infrared; Cr~(2+);

    机译：Ⅱ-Ⅵ;过渡金属掺杂硫族化物；中红外铬〜（2+）;

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