Ultra-Low Power Self-Starting and Dispersion-Balanced Fiber Mode-Locked Laser
A fiber laser with low cavity loss,low self-starting power,stability,and dispersion-balanced performance is required for subsequent amplification,self-compression,and external field experimental applications.Therefore,this study conducts an in-depth investigation of the critical role of the phase shifter in laser self-starting using theoretical analysis and numerical simulation methods.Additionally,the relationship between the gain fiber doping concentration and the laser starting threshold is established.Based on theoretical results,a low-loss and near-zero dispersion fiber-laser oscillator was constructed using a nonlinear amplified loop mirror.The proposed oscillator achieves an ultra-low self-starting power of 60 mW and a minimum stable operating power consumption of 30 mW,thus,validating the theoretical results.To adapt to more experimental environments,a nonlinear amplification loop mirror with a separated device structure containing a variable wave plate was constructed to ensure the self-starting capability of the laser.Additionally,a piezoelectric ceramic and an optical modulator were added for laser stabilization according to the international time and frequency standard.The laser self-starting power is 160 mW with only 16 mW maintenance power required.
mode-locked laserlaser fiberultra-fast nonlinear opticsfiber optics amplifiers and oscillators
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