Chirped pulse amplification of an ultrahigh-repetition-rate Ti:sapphire frequency comb using a tapered semiconductor amplifier

Chirped pulse amplification of a 1.6 GHz Ti:sapphire femto-second frequency comb was achieved using a GaAs-based tapered semiconductor amplifier. The spectral component of 855-865 nm was coherently amplified up to 379 mW at 2.5 A, corresponding to a peak power of 1.48 kW and an average power of 150 mu W per mode. AchirpedBragg grating was used for pulse stretching and compression, resulting in a 150 mm x 200 mm compact amplification system. Competition between the amplified spontaneous emission and the coherent signal was observed at high driving currents. A numerical analysis was presented to account for the observed gain suppression. This amplification method is useful for the realization of high repetition rate frequency combs with a wider spectral range, including the UV and mid-infrared regions. (C)2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Automated summary

The chirped pulse amplification of a 1.6 GHz Ti:sapphire femto-second frequency comb was successfully achieved using a GaAs-based tapered semiconductor amplifier. The amplified spectral component reached a peak power of 1.48 kW and an average power of 150 mu W per mode. The competition between amplified spontaneous emission and coherent signal was observed at high driving currents, with a numerical analysis presented to explain the gain suppression. This amplification method is valuable for high repetition rate frequency combs with a wider spectral range.