A Self-Starting Linear Cavity Yb:Fiber Laser

We report a comprehensive investigation of self-starting mode-locking in linear cavity fiber lasers. Through theoretical analysis and experimental validation, we demonstrate the effectiveness of self-starting mode-locking. This is achieved by employing a compact and simple linear cavity design, along with enhanced intracavity power. Our findings reveal that the short cavity length and high nonlinearity within the laser system are critical factors in satisfying the self-starting conditions. Furthermore, we delve into the underlying principles of nonlinear polarization evolution mode-locking by examining the role of transmissivity. The resulting laser operates at a repetition rate of 736 MHz, delivering an average power of 108 mW and generating pulses with a duration of 99 fs. This compact, robust, and high-repetition-rate femtosecond laser holds significant promise for a wide range of applications.