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利用相位长周期光纤光栅作为光谱滤波器,熔接于全正色散掺镱光纤激光系统中,从而实现了具有波长可调谐的连续激光输出和被动锁模激光脉冲输出,可调谐激光波长范围分别为11.4 nm和10.5 nm。通过调节偏振片改变激光腔内的偏振状态,输出锁模脉冲实现脉冲宽度的可调谐,其调谐范围为3.6~1.2 ns。在530 m W的最大泵浦功率下,得到了重复频率为2.5 MHz、最大单脉冲能量为38.9 n J的锁模脉冲输出和最大输出功率为124 m W的连续激光输出。
The phase long period fiber grating is used as a spectral filter and fused in an all-positive-dispersion Ytterbium-doped fiber laser system to achieve a wavelength-tunable continuous laser output and a passive mode-locked laser pulse output. The tunable laser wavelength ranges are 11.4 nm and 10.5 nm. By adjusting the polarizer to change the polarization state in the laser cavity, the output of the mode-locked pulse can achieve the tunability of the pulse width. The tuning range is 3.6 ~ 1.2 ns. At a maximum pump power of 530 mW, a mode-locked pulse output with a repetition frequency of 2.5 MHz, a maximum single pulse energy of 38.9 nJ, and a continuous laser output with a maximum output power of 124 mW was obtained.