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Precise frequency measurement and characterization of a continuous scanning single-mode laser with an optical frequency comb.

We developed a high-precision frequency-measurement system for continuously scanning single-mode cw lasers. The high precision for wide frequency range is realized by employing an optical frequency comb. The developed system operates as a strong tool for analyzing the spectral profile and scan characteristics of lasers, which is suitable for high-resolution molecular spectroscopy. We demonstrated the ability of our system with Doppler-free spectroscopy of molecular iodine.