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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...

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Updated: May 25, 2026

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

Published on: December 22, 2015

[Research on improving spectrum resolution of optimized Wollaston prism array].

Peng Zhang¹, Jian-Rong Wang, Guo-Chen Zhang

¹National Key Laboratory for Electronic Measurement Technology, North University of China, Taiyuan 030051, China. sxyczhangpeng@126.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu

|January 17, 2012

Summary

Optimizing Wollaston prism structure enhances spectral resolution by improving interference fringe contrast. This leads to more accurate spectral data analysis using digital signal processing (DSP).

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Published on: February 12, 2014

Area of Science:

Optics
Spectroscopy
Prism design

Context:

Wollaston prisms are crucial optical components for spectral analysis.
Improving spectral resolution often involves trade-offs with image quality.
Existing Wollaston prism designs can be limited in their ability to enhance resolution without compromising fringe quality.

Purpose:

To optimize the structure of a Wollaston prism to improve spectral resolution.
To eliminate the dependence of interference fringe imaging on the prism's splitting angle.
To enhance the contrast and accuracy of spectral data obtained from interference fringes.

Summary:

The study optimized Wollaston prism structure by modifying its angles and incorporating an isosceles triangle prism.
This optimization ensures that the extraordinary (e) and ordinary (o) light rays remain parallel to the optical axis, regardless of splitting angle changes.
Optimized Wollaston prisms, arranged in an array, were experimentally validated for 980 nm laser spectrum detection, showing improved fringe contrast.

Impact:

The optimized design allows for higher spectral resolution without degrading interference fringe image quality.
Experimental results demonstrate clearer interference fringes and more accurate spectral data after Fourier transformation with digital signal processing (DSP).
This advancement has implications for precision spectroscopy and optical metrology.