单壁碳纳米管锁模的高稳定性全保偏少周期飞秒光纤激光器OA

To meet the stringent requirements of attosecond science,precision manufacturing,and ultrafast spectroscopy for high-performance ultrashort pulses,we report the development of a highly stable,self-start-ing all-polarization-maintaining few-cycle femtosecond fiber laser.An all-polarization-maintaining erbium-doped fiber seed source with repetition frequency of 100.45 MHz is constructed using a single-walled carbon nanotube film as a saturable absorber.By employing an all-polarization-maintaining bidirectional amplifica-tion scheme combined with nonlinear spectral broadening and dispersion management,the system achieves a pulse duration of 30.1 femtoseconds after nonlinear broadening in a polarization-maintaining highly nonlin-ear fiber and subsequent dispersion compensation.This corresponds to a few-cycle pulse train containing ap-proximately 5.8 optical cycles,with an amplified average output power exceeding 200 milliwatts.Stability measurements demonstrate that the seed source maintains a power root-mean-square fluctuation of only 0.4 percent over 10 hours of continuous operation.Furthermore,after the implementation of temperature control and piezo-electric transducer stabilization for repetition rate locking,the Allan deviation reaches 9.98×10−14 over 100 seconds.With its compact architecture and exceptional operational stability,this seed source estab-lishes a robust experimental foundation for the subsequent generation of octave-spanning supercontinuum and high-performance frequency comb applications.