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实验研究了基于国产高增益掺Yb3+双包层大模场面积(LMA)光纤的简化腔结构激光器的稳定锁模运转,直接使用塌陷打磨之后的光纤端面作为线型腔中的一端腔镜,利用打磨为0°角之后的光纤端面4%的反射率,在高增益的条件下获得了激光振荡,并进一步利用半导体可饱和吸收镜(SESAM)获得稳定的锁模输出,得到了平均功率分别为144 mW和120 mW,重复频率均为68 MHz(对应单脉冲能量分别为2.1 nJ和1.8 nJ),脉冲宽度分别为9.9 ps和4.8 ps的超短脉冲输出。通过增加抽运功率,得到了功率分别为150 mW和220 mW的稳定多脉冲输出,对应脉冲个数为两个和四个。进而通过激光谐振腔中的光栅对,实现了波长1020~1080 nm宽带可调谐的超短脉冲输出。
A stable mode-locked mode operation of a simplified cavity-structured laser based on a domestic high-gain Yb3 + double-clad LMA fiber is experimentally studied. The end face of the fiber after collapse and grinding is directly used as one endoscope in a linear cavity. 4% reflectivity of the optical fiber end face polished at an angle of 0 °, laser oscillation obtained under a high gain condition, and a stable mode-locked output obtained by using a semiconductor saturable absorption mirror (SESAM), the average power was 144 mW and 120 mW at 68 MHz repetition rates (2.1 nJ and 1.8 nJ for single pulse energy respectively) with ultrashort pulse outputs of 9.9 ps and 4.8 ps respectively. By increasing the pumping power, a stable multi-pulse output with powers of 150 mW and 220 mW respectively is obtained, with two and four corresponding pulses. Then through the grating pair in the laser resonator, a broadband tunable ultrashort pulse output with wavelength of 1020 ~ 1080 nm is realized.