光窄带滤波器及其在光纤激光器中的应用

单频光纤激光器在光通讯和光传感领域具有广泛的应用前景.采用数值分析的方法求解了基于可饱和吸收体的光窄带滤波器耦合模方程,对影响光窄带滤波器输出响应特性的掺杂光纤的长度、吸收系数和输入泵浦功率进行了理论分析;通过实验验证了构成可饱和吸收体的掺杂光纤长度与光窄带滤波器响应带宽成反比的结论;将光窄带滤波器应用于光纤激光器中,获得了输出激光功率大于1mW,不跳模时间大于2h,线宽在百赫兹量级,2h内的功率不稳定度为0.02287％的单纵模激光输出. 

Optical narrowband filter and its application to fiber lasers

Single-mode fiber laser is a very important light sources for optical sensing and optical communication.The coupled mode function of basing on saturable absorber optical narrow-band filter using numerical analysis was soluted.The factors who effected optical narrow-band filter output response properties,for example the length of Erbium-doped-fiber,the absorption coefficient of Erbium-doped-fiber and the pump wave power was analysed.The length of Erbium-doped-fiber composing saturable absorber inversing with the response bandwidth of filter was verificated experimentally.The optical narrow-band filter to fiber laser was applied,then narrow-band single-longitudinal-mode laser output was got,and the linewidth of laser output is about hundreds of Hertz magnitude.The power of output laser is more than 1mW and the lasing time of no mode-hopping is more than 2 hours.The power instability of the fiber laser is less than 0.0287%.