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Measurement of X-ray Beam Coherence along Multiple Directions Using 2-D Checkerboard Phase Grating

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Published on: October 11, 2016

Beam shape effects on grating spectrometer resolution.

E F Erickson¹, D Rabanus

¹NASA-Ames Research Center, MS 245-6, Moffett Field, California 94035-1000, USA. erickson@cygnus.arc.nasa.gov

|March 20, 2008

Summary

This summary is machine-generated.

Optical beams in grating spectrometers can reduce spectral resolution. This study estimates the loss, finding it reduces resolving power by about 15% due to varying groove illumination.

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Area of Science:

Spectroscopy
Optical Engineering
Physics

Background:

Grating spectrometers use optical beams to disperse light.
The cross-section of these beams can vary (circular or elliptical).
Different beam parts may illuminate varying numbers of grating grooves.

Purpose of the Study:

To estimate the impact of non-uniform groove illumination on spectral resolution.
To quantify the loss in resolving power caused by beam shape variations.

Main Methods:

Theoretical estimation of spectral resolution loss.
Analysis of optical beam geometry and grating interaction.

Main Results:

Varying illumination of grating grooves reduces spectral resolution.
This effect leads to an approximate 15% reduction in intrinsic resolving power.
This loss is independent of other factors like entrance slit width.

Conclusions:

Beam shape significantly affects spectrometer performance.
The calculated 15% resolution loss is a key factor in spectrometer design and calibration.
Further research should consider combined effects for comprehensive analysis.