Precision Wavelength Calibration for Display Spectroradiometers: A Reproducibility Study

Wide gamut laser displays, microLED, and OLED technologies demand high spectral accuracy and low measurement uncertainty, making robust calibration essential for reliable metrology. This study evaluates the reproducibility of a four-line laser diode wavelength calibration method for spectroradiometers using Gage Repeatability and Reproducibility (Gage R&R) analysis. Measurements were performed on three qualified spectroradiometers using a known spectral line from a mercury (Hg) lamp. The results show negligible operator influence and low repeatability error, with an expanded uncertainty below ± 0.1 nm. The method demonstrates strong reproducibility and sensitivity to systematic errors, making it suitable for production environments and instrument diagnostics.