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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Whispering-gallery mode resonators for highly unidirectional laser action
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Whispering-gallery mode resonators for highly unidirectional laser action

机译：耳语画廊模式谐振器，用于高度单向激光作用

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摘要

Optical microcavities can be designed to take advantage of total internal reflection, which results in resonators supporting whispering-gallery modes (WGMs) with a high-quality factor (Q factor). One of the crucial problems of these devices for practical applications such as designing microcavity lasers, however, is that their emission is nondirectional due to their radial symmetry, in addition to their inefficient power output coupling. Here we report the design of elliptical resonators with a wavelength-size notch at the boundary, which support in-plane highly unidirectional laser emission from WGMs. The notch acts as a small scatterer such that the Q factor of the WGMs is still very high. Using midinfrared (A~ 10//m) injection quantum cascade lasers as a model system, an in-plane beam divergence as small as 6 deg with a peak optical power of ~5 mW at room temperature has been demonstrated. The beam divergence is insensitive to the pumping current and to the notch geometry, demonstrating the robustness of this resonator design. The latter is scalable to the visible and the near infrared, thus opening the door to very low-threshold, highly unidirectional microcavity diode lasers.
机译：可以设计光学微腔以利用全内反射的优势，从而使谐振器支持具有高质量因子（Q因子）的耳语画廊模式（WGM）。但是，这些设备在实际应用中（例如设计微腔激光器）的关键问题之一是，除了其效率低下的功率输出耦合之外，由于其径向对称性，它们的发射是无方向性的。在这里，我们报告了在边界处具有波长尺寸切口的椭圆谐振器的设计，该椭圆谐振器支持WGM产生的面内高度单向激光发射。陷波起很小的散射作用，因此WGM的Q因子仍然很高。使用中红外（A〜10 // m）注入量子级联激光器作为模型系统，已证明室温下面内光束发散小至6度，峰值光功率为〜5 mW。光束发散对泵浦电流和陷波几何形状不敏感，证明了这种谐振器设计的坚固性。后者可扩展至可见光和近红外光，从而为低阈值，高度单向的微腔二极管激光器打开了大门。

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    Qi Jie Wang; Changling Yan; Nanfang Yu; Julia Unterhinninghofen; Jan Wiersig; Christian Pflugl; Laurent Diehl; Tadataka Edamura; Masamichi Yamanishi; Hirofumi Kan; Federico Capasso;

  • 作者单位

    School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138;

    School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138;

    School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138;

    Institut fur Theoretische Physik, Universitat Magdeburg, Postfach 4120, D-39016 Magdeburg, Germany;

    Institut fur Theoretische Physik, Universitat Magdeburg, Postfach 4120, D-39016 Magdeburg, Germany;

    School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138;

    School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138;

    Centra! Research Laboratory, Hamamatsu Photonics K.K., Hamamatsu 434-8601, Japan;

    Centra! Research Laboratory, Hamamatsu Photonics K.K., Hamamatsu 434-8601, Japan;

    Centra! Research Laboratory, Hamamatsu Photonics K.K., Hamamatsu 434-8601, Japan;

    School of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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