Accurate Frequency Atlas of 1.5 μm Band of Acetylene Measured by a Mode-Locked Fiber Laser

We have been developing optical frequency standards based on absorption lines of acetylene molecules. Using optical frequency comb generators such as a mode-locked fiber laser, we are now measuring difference frequencies between each rotational-vibrational transition and a P(16) line of acetylene molecule. These transitions can be used as accurate frequency references for the calibration at telecom region