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首页> 外文会议>Laser resonators and beam control XIII >Hyper coherent linewidth control for a 30mW 405nm visible laser diode by delayed self-heterodyne beat
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Hyper coherent linewidth control for a 30mW 405nm visible laser diode by delayed self-heterodyne beat

机译：通过延迟自外差拍来控制30mW 405nm可见激光二极管的超相干线宽

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摘要

We have demonstrated a hyper coherent spectral linewidth evaluation for a frequency stabilized 405nm GaN violet laser diode (LD) based on the delayed self-heterodyne beat. The laser light source was stabilized to a reference confocal Fabry-Perot (CFP) cavity by negative electrical feedback to the injection current of the LD under the Pound-Drever-Hall technique. In addition, by introducing optical feedback from another tilted CFP cavity, the spectral linewidth has been efficiently narrowed. In this scheme, we have achieved 1.65×10~(-11) estimated with Allan variance for the feedback error signal from CFP cavity. We also measured the linewidth directly by a separate FP interferometer, which resulted in close coincidence with above Allan variance estimations. In this work, we have tried to measure our narrowed linewidth by the delayed self heterodyne technique which consists of optical fiber of about lkm~3km length to have delay time the light of our stabilized violet laser. In conclusion, we have achieved a practical and inexpensive linewidth control for a high power violet LD to attain hyper coherent conditions of the semiconductor lasers.
机译：我们已经证明了基于延迟的自外差拍频的频率稳定的405nm GaN紫激光二极管（LD）的超相干光谱线宽评估。在Pound-Drever-Hall技术下，通过对LD注入电流的负电反馈，将激光光源稳定到参考共焦Fabry-Perot（CFP）腔。另外，通过从另一个倾斜的CFP腔引入光反馈，可以有效地缩小光谱线宽。在该方案中，对于来自CFP腔的反馈误差信号，我们利用艾伦方差实现了1.65×10〜（-11）的估计。我们还通过单独的FP干涉仪直接测量了线宽，这与上述Allan方差估算值非常吻合。在这项工作中，我们尝试通过延迟自外差技术来测量变窄的线宽，该技术由长度约1km〜3km的光纤组成，以延迟我们稳定的紫罗兰色激光器发出的光的时间。总之，我们已经获得了一种实用且廉价的线宽控制，可用于高功率紫光LD，以实现半导体激光器的超相干条件。

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