论文标题
软孔径空间滤波：在单个空间模式下从高度多模式激光二极管中的单个空间模式下1.5W
Soft aperture spatial filtering: 1.5W in a single spatial mode from a highly multi-mode laser diode in an external cavity
论文作者
论文摘要
广泛的区域激光二极管对它们可以产生的高光电功率具有吸引力。不幸的是，这种高功率通常是以严重降低的空间相干性为代价的，因为半导体波为为指南的较大面积在固有的空间多模式上（在慢速轴上）。我们通过将其放置在模式选择性的外部空腔中，证明了一种主要改善高功率宽面积二极管激光器的空间相干性的方法。我们设计了腔度，以使二极管孔充当其自身的空间滤波器，从而避免了对腔内缝隙过滤器的需求，并最佳地利用了整个增益介质。我们使用$ 200 \ rm {μm} $和$ 300 \ rm {μm} $宽度的宽二极管证明了这种软滤波方法，并将其功率效率与用缝隙进行硬过滤的标准方法进行比较。我们在纯单模中获得了高增益操作，以$ 1064 \ rm {nm} $ $ 1.5 \ rm {w} $ cw电源，具有高光质量。
Broad area laser diodes are attractive for the high optical power they can produce. Unfortunately, this high power normally comes at the cost of severely reduced spatial coherence since the wide area of the semiconductor wave-guide is inherently spatially multi-mode (in the slow axis). We demonstrate a method to majorly improve the spatial coherence of a high-power broad-area diode laser by placing it in an external cavity that is mode selective. We design the cavity, such that the diode aperture acts as its own spatial filter, obviating the need for an intra-cavity slit-filter, and optimally utilizing the entire gain medium. We demonstrate this soft filtering method using wide diodes of $200 \rm{μm}$ and $300 \rm{μm}$ widths and compare its power-efficiency to the standard approach of hard-filtering with a slit. We obtain high-gain operation in a pure single-mode, demonstrating up to $1.5\rm{W}$ CW power at $1064 \rm{nm}$ with high beam quality.
