Abstract
We developed a multi-Fabry-Perot etalon (multi-FPE) for selecting high-frequency parts of repetition-frequency modes of a shortpulse mode-locked fiber laser at the wavelength of 1.55 mm. The 5-GHz repetition-modified laser beam is transmitted to a fiber-type Michelson interferometer. The interference fringes exhibit a temporal coherence pattern and can be used for measuring spatial positioning. The performance of CMM’s axis was determined directly from different positions of two interference fringes.
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