Absolute Calibration of a Broadband Transmission Grating Spectrometer from 5 to 400 nm with Uncertainty Estimates

E. Chebykin; A. E. H. Gaballah; R. van der Horst; A. Giglia; N. Mahne; M. van de Kerkhof; M. D. Ackermann; M. Bayraktar

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arXiv · 2611.09288

Absolute Calibration of a Broadband Transmission Grating Spectrometer from 5 to 400 nm with Uncertainty Estimates

E. Chebykin·A. E. H. Gaballah·R. van der Horst·A. Giglia·N. Mahne·M. van de Kerkhof·M. D. Ackermann·M. Bayraktar

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Abstract

We present the absolute calibration of a transmission grating spectrometer (TGS) with uncertainty estimates in the 5--400 nm range using synchrotron radiation at the BEAR beamline at Elettra light source in Trieste, Italy. Firstly, the spectral responsivity of a Si photodiode in the spectrometer was absolutely calibrated with respect to the absolutely-calibrated beamline photodiode. Subsequently, this photodiode was used to calibrate the transmittance of Zr and Al thin-film filters, along with bulk MgF$_2$ and UV-grade fused silica windows at their operating positions in the spectrometer to minimize mounting-induced uncertainties. Next, the quantum efficiency of the spectrometer's CCD camera was calibrated over the 5--400 nm range. Lastly, three gratings with line densities of 10000, 3000, and 1000 lines/mm were calibrated for spectroscopy in the ranges extending from soft X-ray to extreme-, vacuum- and deep-ultraviolet (DUV) wavelengths, respectively. The combination of various filters and gratings enables absolutely calibrated spectroscopy with high versatility across a broad wavelength range from soft X-rays to DUV.

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E. Chebykin, A. E. H. Gaballah, R. van der Horst, A. Giglia, N. Mahne, M. van de Kerkhof, M. D. Ackermann, M. Bayraktar. 2026-11-06. Absolute Calibration of a Broadband Transmission Grating Spectrometer from 5 to 400 nm with Uncertainty Estimates. https://arxiv.org/abs/2611.09288

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