Abstract
Laser-based optical interferometry has long been playing a central role in the progress of dimensional metrology for precision manufacturing. Meanwhile, mode-locked lasers are nowadays available to facilitate the progress by responding to ever-growing industrial demands on the measurement precision and functionality beyond the capabilities of conventional lasers. The optical spectrum of mode-locked lasers, referred to as the frequency comb, acts as the ruler enabling ultra-stable wavelengths to be produced for precision interferometry with traceability to the atomic clock. In addition, mode-locked lasers are employed directly as the light source offering ultrashort pulses, of which the time-of-flight can be detected with unprecedented precision in implementing long distance measurement. Further, mode-locked lasers are able to provide well-controlled temporal coherence in combination with high spatial coherence, being suited to overcome the technical barriers long standing in 3-D profiling of rough surfaces. In summary, mode-locked lasers are now ready to lead the advance of dimensional metrology by providing unique temporal and spectral benefits over conventional continuous wave lasers or broad-spectrum light sources.
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Acknowledgment
This work was supported by the National Research Foundation of the Republic of Korea (NRF-2012R1A3A1050386).
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Kim, SW., Jang, YS., Park, J., Kim, W. (2019). Dimensional Metrology Using Mode-Locked Lasers. In: Gao, W. (eds) Metrology. Precision Manufacturing. Springer, Singapore. https://doi.org/10.1007/978-981-10-4912-5_1-1
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DOI: https://doi.org/10.1007/978-981-10-4912-5_1-1
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