Discontinuous wavelength-scanning interferometry with an unknown gapped spectrum

• DOI: 10.1364/ol.554121
• Publication Date: 2025-04-30T11:00:30Z
• Authors: Yulei Bai; Hao Qiu; Zean Huang; Zhaoshui He; Shengli Xie; Bo Dong

Depth-resolved wavelength-scanning interferometry (DRWSI) has emerged as a powerful topographic technique for simultaneously measuring multiple surfaces. Conventional DRWSI requires the laser to emit continuous spectrum; however, ensuring this condition is often challenging. This Letter presents discontinuous measurement approach that can automatically predict missing intensity within gapped spectrum without requiring any prior knowledge. Therefore, phase jitters caused by discontinuities in wavelength scanning be effectively removed, enabling high-quality reconstruction of depth-resolved maps. Simulation demonstrated proposed accurately restore map even when gap interval 10 times larger than entire range. Experimental results confirm robustness measurements under mode-hopping outputs. The contribution work alleviate stringent requirements diode output, enhancing flexibility and practicality measurements.