Tunable structured laser over full spatial spectrum.

IF 24 Q1 OPTICS

Light-Science & Applications Pub Date : 2026-03-13 DOI:10.1038/s41377-026-02243-3

Quan Sheng,Jing-Ni Geng,Jia-Qi Jiang,Tian-Chang Liu,David James Spence,Helen Margaret Pask,Allam Srinivasa Rao,Takashige Omatsu,Shi-Jie Fu,Zhen-Xu Bai,Zhi-Wei Lv,Wei Shi,Jian-Quan Yao,Carmelo Rosales-Guzmán,Zhi-Han Zhu

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Abstract

Modern tunable lasers are indispensable instruments in fundamental science and optical frequency applications. With the growing interest in structured light, there's a need for tunable structured lasers with high transverse electromagnetic (TEM) modal purity across a broad spatial spectrum, but no commercial solutions exist. Here, we present the first tunable structured laser that can emit all possible single TEM modes with extremely high purity over a wide range. This is achieved by the collaborative use of intracavity pump geometry and astigmatic detuning to selectively gain a desired mode while blockading others. Our astigmatic oscillator can tunably generate any TEM mode within the spatial bandwidth, achieving over 40,000 orthogonal Hermite-Gauss modes in the experiment, and each can be further expanded into numerous Hermite-Laguerre-Gauss modes via unitary transformation. This approach does not require extra intracavity beam shaping components, offering a promising design for commercially available structured lasers with full spatial spectrum tunability.

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全空间光谱可调谐结构激光器。

现代可调谐激光器是基础科学和光频应用中不可缺少的仪器。随着人们对结构光的兴趣日益浓厚，需要在宽空间光谱范围内具有高横向电磁（TEM）模态纯度的可调谐结构激光器，但目前还没有商业解决方案。在这里，我们提出了第一个可调谐的结构激光器，它可以在宽范围内以极高的纯度发射所有可能的单TEM模式。这是通过协同使用腔内泵的几何形状和散光失谐来选择性地获得所需的模式，同时阻塞其他模式来实现的。我们的散像振荡器可以在空间带宽内可调谐地产生任何TEM模式，在实验中实现了超过40,000个正交的Hermite-Gauss模式，并且每个模式都可以通过幺正变换进一步扩展成多个Hermite-Laguerre-Gauss模式。这种方法不需要额外的腔内光束整形组件，为具有全空间光谱可调性的商用结构激光器提供了一种有前途的设计。

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