Diffraction by ruled gratings with variable spacing: fundamental method of intensity calculation

被引：2

作者：

Chatterjee, S. ^{[1
,2
]}

Vani, V. C. ^{[3
]}

Haghighi, Rezvan R. ^{[4
]}

Banyal, Ravinder K. ^{[2
]}

机构：

[1] Ongil, 4 Rajiv Gandhi Salai, Chennai 600113, Tamil Nadu, India

[2] Indian Inst Astrophys, Bangalore 560034, Karnataka, India

[3] Indian Inst Sci, Dept Instrumentat & Appl Phys, Bangalore 560012, Karnataka, India

[4] Shiraz Univ Med Sci, Med Imaging Res Ctr, Shiraz 7134845794, Iran

来源：

APPLIED OPTICS | 2019年 / 58卷 / 31期

关键词：

D O I：

10.1364/AO.58.008638

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A regular diffraction grating produces intensity patterns that combine waves coming through equispaced slits, so that the waves emerging from any two neighboring slits have identical phase differences. In this paper, we calculate the degradation in the intensity pattern when the grating has irregular spacing. The model of randomness considers the grating spacing and openings as being created by a "random walk." The resolving power of the grating is evaluated in relation to the D lines of sodium. It is shown that as the number of rulings increases, the uniformity of their spacing becomes more important in precision spectroscopic measurements, such as in astrophysical spectroscopy. (C) 2019 Optical Society of America

引用

页码：8638 / 8647

页数：10

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