Monolithic 0–f Scheme-Based Frequency Comb Directly Driven by a High-Power Ti:Sapphire Oscillator**Supported by the National Key R&D Program of China (Grant No. 2017YFC0110301), the National Natural Science Foundation of China (Grant Nos. 91950113, 61575219, 61210017, 11774234, 11674386, 11434016, and 91850209), the Strategic Priority Research Program of the CAS (Grant No. XDB23030203), and the Youth Innovation Promotion Association of the CAS

Abstract

A monolithic 0–f scheme-based femtosecond optical frequency comb directly driven by a high-power Ti:sapphire laser oscillator is demonstrated. The spectrum covering from 650 nm to 950 nm is generated from the Ti:sapphire oscillator with a repetition rate of 170 MHz. The average output power up to 630 mW is delivered under the pump power of 4.5 W. A 44-dB signal-to-noise ratio (SNR) of the carrier-envelope phase offset (CEO) beat note is achieved under the resolution of 100 kHz and is long-term stabilized to a reference source at 20 MHz. The integrated phase noise (IPN) in the range from 1 Hz to 1 MHz is calculated to be 138 mrad, corresponding to the timing jitter of 63 as at the central wavelength of 790 nm.