Design and measurement of convex grating in conical diffraction Offner spectrometer

Qiao Pan; Xinhua Chen; Jiankang Zhou; Zhicheng Zhao; Weimin Shen

doi:10.1117/1.OE.58.2.025109

26 February 2019 Design and measurement of convex grating in conical diffraction Offner spectrometer

Qiao Pan, Xinhua Chen, Jiankang Zhou, Zhicheng Zhao, Weimin Shen

Author Affiliations +

Optical Engineering, Vol. 58, Issue 2, 025109 (February 2019). https://doi.org/10.1117/1.OE.58.2.025109

Abstract

Offner spectrometer is widely applied in hyperspectral imaging spectrometers, in which the design, fabrication, and testing of convex gratings are crucial to ensure the spectral and imaging performance of the whole system. A conical diffraction Offner spectrometer is proposed with the spectral range of 400 to 900 nm, spectral resolution of 5 nm, slit length of 1 mm, and spectral dispersive width of 10 mm. A finite-element analysis is adopted to optimize the groove parameters of the conical diffraction blazed convex grating that is used in the aforesaid spectrometer. Holographic scan ion beam etching method is employed to fabricate such convex grating. Experimental facilities for testing the diffraction efficiency are built in the lab, showing that the efficiency is higher than 50% in the whole waveband and the peak efficiency is over 75%, which is consistent with the design result. The result indicates that it is feasible to design and optimize the grating groove using the finite-element analysis method.

Citation Download Citation

Qiao Pan, Xinhua Chen, Jiankang Zhou, Zhicheng Zhao, and Weimin Shen "Design and measurement of convex grating in conical diffraction Offner spectrometer," Optical Engineering 58(2), 025109 (26 February 2019). https://doi.org/10.1117/1.OE.58.2.025109

Received: 30 July 2018; Accepted: 6 February 2019; Published: 26 February 2019

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