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针对基于半导体可饱和吸收镜(SESAM)锁模光纤激光器脉冲底座宽和脉冲能量小的问题展开研究,报道了一种基于线型腔结构的透/反复合双饱和吸收体(SA)被动锁模超短脉冲光纤激光器。通过增加透射式SA的方式,增加光脉冲在腔内的一次振荡周期过程中通过透射式SA的次数,提高了吸收体对光脉冲前后沿的吸收,摆脱了因SESAM调制深度较低对脉冲宽度和单脉冲能量的影响,降低了因抽运功率过大产生的色散和非线性效应对光脉冲的影响,进一步提高了单脉冲能量。最终与相同调制深度的反射式单SESAM结构相比,复合双SA锁模结构的脉冲宽度从776fs缩短至732fs,单脉冲能量从2.08nJ提高到2.49nJ。
Aiming at the problems of wide pulse width and low pulse energy of a mode-locked fiber laser based on SESAM, a passively and mode-locked double saturable absorber (SA) passive mode-locking Ultrashort pulsed fiber laser. By increasing the transmission SA mode, increasing the number of transmission SA through the optical pulse in the first oscillation period of the cavity increases the absorption of the absorber on the front and back edges of the optical pulse, which is better than the low modulation depth due to the SESAM modulation to the pulse width And single-pulse energy, the influence of the dispersion and non-linear effect on the light pulse due to the excessive pumping power is reduced, and the single-pulse energy is further increased. Finally, compared with the single SESAM structure with the same modulation depth, the pulse width of the double SA mode structure is shortened from 776fs to 732fs and the single-pulse energy is increased from 2.08nJ to 2.49nJ.