Abstract

Spatial heterodyne spectrometers are members of the static Fourier transform class of spectrometers, well-regarded for their ability to acquire high-resolution, high wavelength precision emission spectra in compact, light footprint packages. In a spatial heterodyne spectrometer experiment, a Fizeau fringe is generated for every spectral feature in a given spectrum, and spatial heterodyne spectrometer records the superposition of all Fizeau fringes in the spectrum on a detector. Hence, the sensitivity of spatial heterodyne spectrometers is constrained by uncorrelated, multiplicative photon noise that limits the detection of spectral features to those that are more luminous than the square root of the total incident flux onto the detector. In essence, powerful spectral features create a rising floor of noise that wash out less luminous features. In the present work, we introduce a novel spectrometer coupling, that being an Amici prism spectrometer in series with spatial heterodyne spectrometer, that correlates photon shot noise along one axis of a detector that in turn suppresses multiplicative photon noise within each row of the interferogram image. We demonstrate that this spectrometer pairing facilitates the measurement of weak Raman spectral features that, in a traditional spatial heterodyne spectrometer measurement, would be washed out by multiplicative photon noise.

© 2020 The Author(s)

Design study of a cross-dispersed spatial heterodyne spectrometer

Qihang Chu, Xiaotian Li, Jirigalantu, Ci Sun, Jun Chen, Jianing Wang, Yuqi Sun, and Bayanheshig
Opt. Express 30(7) 10547-10562 (2022)

Theoretical analysis of a multi-grating-based cross-dispersed spatial heterodyne spectrometer

Qihang Chu, Xiaotian Li, Yuqi Sun, Jirigalantu, Ci Sun, Jun Chen, Fuguan Li, and Bayanheshig
Opt. Express 31(11) 18190-18209 (2023)

Modeling and correction of fringe patterns in Doppler asymmetric spatial heterodyne interferometry

Daikang Wei, Qiucheng Gong, Qiuyu Chen, Yajun Zhu, Martin Kaufmann, Friedhelm Olschewski, Peter Knieling, Florian Dötzer, Klaus Mantel, Jiyao Xu, Ralf Koppmann, and Martin Riese
Appl. Opt. 61(35) 10528-10537 (2022)

Radiometric and signal-to-noise ratio properties of multiplex dispersive spectrometry

Alessandro Barducci, Donatella Guzzi, Cinzia Lastri, Vanni Nardino, Paolo Marcoionni, and Ivan Pippi
Appl. Opt. 49(28) 5366-5373 (2010)

Broadband transmission Raman measurements using a field-widened spatial heterodyne Raman spectrometer with mosaic grating structure

Jun Qiu, Xiangdong Qi, Xiaotian Li, Yuguo Tang, Jiriga Lantu, Xiaotao Mi, and Heshig Bayan
Opt. Express 26(20) 26106-26119 (2018)