Realisation of an accurate and repeatable wavelength scale for double subtractive monochromators

Published

October 30, 2012

Author(s)

Malcolm G. White

Abstract

We present the results and discussion of two methods for achieving a higher degree of wavelength accuracy of double grating monochromators. In particular, we assessed the benefits of using differential evolution curve fitting techniques to minimize wavelength uncertainties associated with the manufacture of lead screws in sine-bar driven monochromators. Absolute wavelength-scale uncertainties better than {plus or minus}0.1 nm can be realized using this technique. We also report the realization of an accurate and repeatable wavelength scale, using a novel calibration technique, that is applicable to a wide range of monochromators. We present results demonstrating the robustness of the technique by realizing an absolute wavelength scale, across four grating sets from 250 nm to 1600 nm, with scale uncertainties within {plus or minus}0.02 nm and repeatable to {plus or minus}0.005 nm.

Citation

Metrologia

Volume

49

Issue

6

Pub Type

Journals

Download Paper

https://doi.org/10.1088/0026-1394/49/6/779

Keywords

accurate, monochromator, repeatable, wavelength

Citation

White, M. (2012), Realisation of an accurate and repeatable wavelength scale for double subtractive monochromators, Metrologia, [online], https://doi.org/10.1088/0026-1394/49/6/779 (Accessed April 25, 2024)