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Super spectral resolution beyond pixel Nyquist limits on multi-channel spectrometer.

Optics Express 2016 November 15
Enhancement of the resolution of well-distributed multi-channel spectrometers beyond the pixel Nyquist limits while maintaining their inherent advantages such as high-speed measurement, compactness, and robustness will represent a critical step toward real-time monitoring of dynamic events. Here, we report the first super spectral resolution measurement beyond pixel Nyquist limits which was made possible by employing the Moiré effect in a commercially available Czerny-Turner type spectroscope of 4.63nm-spectral resolution. The experimental results show that the spectral resolution can be enhanced up to 0.31 nm by a factor of more than 10 with exceeding the 50-μm pixel Nyquist limits.

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