被动调Q锁模掺镱光纤激光器

报道了基于偏振旋转技术等效快可饱和吸收体的被动调Q锁模光纤激光器,采用976 nm半导体激光器作为抽运源,高掺杂浓度的Yb3 光纤作为增益介质构成环形腔,通过调节抽运光功率和偏振控制器的角度得到了调Q,调Q锁模与锁模三种稳定的输出脉冲。获得的锁模脉冲中心波长为1.05μm,重复频率为20 MHz,脉冲光谱宽度为13.8 nm,抽运功率为270 mW时,锁模平均输出功率为15.82 mW;调Q频率为17.54 kHz,调Q脉冲宽度为8μs,光谱宽度为4.7 nm;调Q锁模中调Q重复频率为300 kHz。

Passive Q-Switching and Modelocking Yb3+-Doped Fiber Laser

An all fiber laser based upon nonlinear polarization rotation as an effective fast saturable absorber for mode-locking is reported. The absorber can act as passive Q-switching and modelocking. The ring laser with a highly Yb3+-doped fiber as the gain medium, pumped by a semiconductor laser of 976 nm wavelength, can operate in three different stable regimes by proper adjustments of pump power and polarizer orientations: Q-switched, Q-switched mode-locked and continuous wave (CW) mode-locked. The center wavelength of the CW mode-locked pulse is 1.05 μm with a full width at half maximum (FWHM) spectrum of 13.8 nm, the pulse repetition rate is 20 MHz, and an average output power is 15.82 mW with 270 mW pump power. In Q-switched regime, the laser generates 8 μs duration pulses of 4.7 nm FWHM spectrum at a repetition rate of 17.54 kHz. The Q-switched repetition rate is 300 kHz in Q-switched mode-locked regime.