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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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A coma-free super-high resolution optical spectrometer using 44 high dispersion sub-gratings.

Hua-Tian Tu¹, An-Qing Jiang^1,2, Jian-Ke Chen¹

¹Department of Optical Science and Engineering, Fudan University, Shanghai, China.

Scientific Reports

|January 14, 2021

Summary

A novel optical spectrometer achieves super-high spectral resolution with zero coma aberration using a compound diffraction grating module. This breakthrough enables precise spectral sensing and measurement across ultraviolet and visible ranges.

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Area of Science:

Optical Engineering
Spectroscopy
Instrumentation

Background:

Traditional Czerny-Turner spectrometers suffer from coma aberration, limiting spectral resolution.
Achieving high spectral resolution and zero aberration simultaneously is a significant challenge in optical instrument design.

Purpose of the Study:

To experimentally demonstrate a novel super-high spectral resolution optical spectrometer with zero coma aberration.
To showcase the capabilities of a new spectrometer design for diverse spectral sensing applications.

Main Methods:

Utilized a compound integrated diffraction grating module with 44 high dispersion sub-gratings.
Employed a two-dimensional backside-illuminated charge-coupled device array photodetector for detection.
Configured a zero-off-axis spectrometer design.

Main Results:

Achieved a spectral resolution of 0.005 nm (5 pm) in the ultraviolet range.
Obtained a spectral resolution of 0.01 nm in the visible range.
Demonstrated uniform diffraction efficiency across a broad 200 nm to 1000 nm wavelength region.

Conclusions:

The demonstrated spectrometer offers unprecedented spectral resolution and zero coma aberration.
The novel zero-off-axis configuration is suitable for a wide array of spectral sensing and measurement tasks.
This advancement represents a significant step forward in high-resolution optical spectroscopy.