Opt Lett. 2023 Mar 1;48(5):1180-1183. doi: 10.1364/OL.483904.
We introduce a new, to the best of our knowledge, optical component-a rotated chirped volume Bragg grating (r-CBG)-that spatially resolves the spectrum of a normally incident light beam in a compact footprint and without the need for subsequent free-space propagation or collimation. Unlike conventional chirped volume Bragg gratings in which both the length and width of the device must be increased to increase the bandwidth, by rotating the Bragg structure we sever the link between the length and width of a r-CBG, leading to a significantly reduced device footprint for the same bandwidth. We fabricate and characterize such a device in multiple spectral windows, we study its spectral resolution, and confirm that a pair of cascaded r-CBGs can resolve and then recombine the spectrum. Such a device can lead to ultracompact spectrometers and pulse modulators.
我们介绍了一种新的光学元件——旋转啁啾体布拉格光栅（r-CBG），据我们所知，这是一种新型的光学元件，它在紧凑的占地面积内，无需后续自由空间传播或准直，就能对正常入射光束的光谱进行空间分辨。与传统的啁啾体布拉格光栅不同，传统的啁啾体布拉格光栅的长度和宽度都必须增加才能增加带宽，而通过旋转布拉格结构，我们切断了 r-CBG 的长度和宽度之间的联系，从而使相同带宽的设备占地面积显著减小。我们在多个光谱窗口中制造和表征了这样一种器件，研究了它的光谱分辨率，并证实了一对级联的 r-CBG 可以分辨然后重新组合光谱。这种器件可以实现超紧凑的光谱仪和脉冲调制器。
