Abstract

Spectrometer calibration accuracies are of high importance for a wide range of applications. Typically, one calibrates the spectrometer with a calibration lamp, providing distinct and well-defined calibration lines. However, for small spectral ranges, where only two calibration lines are present, the calibration becomes inaccurate. We present a high-precision nonlinear wavelength calibration method, which is based on two or more reference lines from a calibration lamp. The additional key element introduced is a Fabry–Perot multilayer structure that yields multiple sharp transmission maxima of similar intensity over the full spectrometer range under broad-band illumination (e.g., white-light source). An iterative algorithm is put forward to obtain a self-consistent calibration of picometer precision over the full spectrometer range. In regions distant from calibration lines the accuracy is enhanced by at least a factor of two compared to conventional methods.

SIM PlanetQuest white-light fringe modeling: picometer accuracy calibration and estimation algorithms

Chengxing Zhai, Jeffrey Yu, Mike Shao, Renaud Goullioud, Mark Milman, and Tsae-Pyng Shen
Appl. Opt. 48(5) 847-861 (2009)

Calibration of subnanometer motion with picometer accuracy

Hernán E. Grecco and Oscar E. Martínez
Appl. Opt. 41(31) 6646-6650 (2002)

Reference lines in the optogalvanic spectra of uranium and thorium over the wavelength range 694–755 nm

W. DeGraffenreid and Craig J. Sansonetti
J. Opt. Soc. Am. B 19(7) 1711-1715 (2002)

Accurate wavelength calibration method for compact CCD spectrometer

Y. C. Sun, C. Huang, G. Xia, S. Q. Jin, and H. B. Lu
J. Opt. Soc. Am. A 34(4) 498-505 (2017)

Iterative local Fourier transform-based high-accuracy wavelength calibration for Fourier transform imaging spectrometer

Yixuan Xu, Jianxin Li, Caixun Bai, Ming Wei, Jie Liu, Yubo Wang, and Yiqun Ji
Opt. Express 28(4) 5768-5786 (2020)