We demonstrate tunable generation of orbital angular momentum (OAM) modes with low loss (0.7 dB) and high efficiency (${\gt}{{90}}\%$) over a 230 nm in the visible and near-infrared spectral range using all-fiber acousto-optic-induced long period gratings. This represents tuning over almost 33% of the carrier frequency, and measured output OAM mode purities are as high as 99%. Our device construction allows accessing any wavelength in the range we probed (591–818 nm) with at most a 55 µs response time. The high-speed tunability, large spectral coverage, and high mode purity can be potentially useful in numerous applications requiring spectrally diverse OAM light.

中文翻译：

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具有宽光谱可调性的集成轨道角动量模式发生器[邀请]

我们展示了在可见光和近红外光谱范围内在 230 nm 范围内具有低损耗 (0.7 dB) 和高效率 ( ${\gt}{{90}}\%$ )的轨道角动量 (OAM) 模式的可调生成使用全光纤声光诱导长周期光栅。这表示调谐到几乎 33% 的载波频率，并且测得的输出 OAM 模式纯度高达 99%。我们的设备结构允许访问我们探测范围内的任何波长 (591–818 nm)，响应时间最多为 55 µs。高速可调性、大光谱覆盖范围和高模式纯度在需要光谱多样化 OAM 光的众多应用中可能有用。