Zhiyi+Wei

A stable optical frequency comb was developed based an ultrabroaden femtosecond Ti:sapphire laser at a repetition rate of 173MHz. With the optimized dispersion control, we directly generated the laser pulse of shorter than 7fs, the laser resonator consists in only three chirped mirrors and one 10% output coupler, as our best knowledge, this is the simplest laser configuration for sub-10fs laser pulse. By difference frequency the ultrabroaden spectrum with a PPLN crystal, we obtained a beat frequency with signal noise ratio of about 30dB. Locking the frequency and repetition rate to a Cs clock, we realized a stable optical comb without the photonic crystal fiber.
 * Stable 200MHz frequency comb by difference frequency the ultrabroaden 7fs Ti:sapphire laser **
 * Zhiyi Wei, ** Yanying Zhao, Hainian Han, Wei Zhang, Jiangfeng Zhu, Peng Wang
 * Joint Laboratory of Advanced Technology in Measurements, **** Beijing National Laboratory for Condensed Matter Physics /Institute of Physics, CAS **