Miniaturized Broadband Spectrometers using Concave Blazed Gratings

While most spectrometers utilize plane gratings, we demonstrate a miniaturized, two-channel, broadband spectrometer with variable-spacing concave gratings, combining imaging optics and diffraction gratings in one component. The design freedom in the grating corrects most optical aberrations achieving a volume of $\lt 26\times 12\times 10\mathrm{m}\mathrm{m}^{3}$ with high spectral resolution.