对飞秒激光作用蓝宝石光纤产生超连续谱进行了实验研究。选用脉冲宽度为50 fs的飞秒激光器作为泵浦光, 9 cm蓝宝石光纤为非线性介质; 当激光器中心波长分别为1 200 nm、1 300 nm、1 400 nm 、1 500 nm时,在蓝宝石光纤输出端均可获得红外和可见波段的超连续光源; 为了寻求可见波段更好的超连续光源输出, 在实验装置中加入半导体可饱和吸收体(SESAM), 利用光纤端面和SASEM构成谐振腔, 通过SESAM的反馈实现多次作用光纤。结果表明, 在可见波段内能够获得460~780 nm平坦稳定的超连续光源输出。

Super-continuous spectrum in sapphire fiber acted by femto-second lasers is researched. A femto-second laser with 50 fs pulse width is chosen as a pumping light source and a 9 cm sapphire fiber as nonlinear medium. The super-continuous light sources in Infrared and visible band can be obtained at sapphire fiber output terminal when laser center wavelength is 1 200 nm, 1 300 nm, 1 400 nm and 1 500 nm respectively. Semiconductor saturable absorber mirror (SESAM) is added to experimental devices to get better super-continuous light source output in visible band. A resonator is made up of fiber terminal surface and SESAM. And multi-acted fiber is realized by SESAM feedback. The results show that 460~780 nm flat and stable super-continuous light source output in visible band is obtained.