Related Experiment Video
Updated: Feb 5, 2026

Measurements of Waves in a Wind-wave Tank Under Steady and Time-varying Wind Forcing
Published on: February 13, 2018
Astigmatism-reduced spherical concave grating holographically recorded by a cylindrical wave and a plane wave for
Abstract:
We propose a new recording system that employs a cylindrical wave and a plane wave to holographically record astigmatism-reduced Rowland-circle spherical gratings. We find that the astigmatism of the grating can be sharply reduced, so that the spectral intensity is improved. Meanwhile, its defocus aberration and meridional coma remain zero throughout the working spectrum, meaning the spectral resolution is similar to that of a conventional grating recorded by symmetric dual plane waves. We designed and made one astigmatism-reduced grating and one conventional grating for an actual Rowland-circle spherical-grating spectrometer. Our experimental results showed that the spectral intensity of the astigmatism-reduced grating is about five times that of the conventional grating, while the resolution of the astigmatism-reduced grating is close to that of the conventional grating.
More Related Videos
Related Concept Videos
Plane Electromagnetic Waves I
The EM field is assumed to be a...
Plane Electromagnetic Waves II
Spherical and Cylindrical Capacitor
Conventionally, considering the symmetry, the electric field between the concentric shells of a spherical capacitor is directed radially outward. The magnitude of the field,...
The Wave Nature of Light
Mohr's Circle for Plane Stress
Consider a set of Cartesian coordinates. The horizontal and vertical axes correspond to normal stress (σ) and shearing stress (τ), respectively. Two points, points A and B, are defined by the normal and shear...
Mohr's Circle for Plane Strain
Mohr's circle visually represents the strain states under various conditions, which is essential for...

