High-Power Femtosecond All-Fiber Laser System A 1.5 Mu M With A Fundamental Repetition Rate Of 4.9 Ghz

In this Letter, we demonstrate a high-power femtosecond all-fiber laser system at 1.5 mu m that operates at a fundamental repetition rate of up to 4.9 GHz. This high repetition rate laser system delivers an average power of 10 W and a pulsewidth of 63 fs in an all-fiber configuration-the best overall performance at 1.5 mu m, so far, in terms of the all- fiber design, high average power, short pulsewidth, and high fundamental repetition rate. Integrated from 10 Hz to 10 MHz, this high-power femtosecond all-fiber laser system exhibits a relative intensity noise of only 0.4%. It is anticipated that this femtosecond laser system is promising for various applications, such as high-speed micromachining, wide-field multiphoton bioimaging, and nonlinear optics. (C) 2021 Optical Society of America