光纤光栅耦合附加腔被动锁模激光器特性的分析

对光纤光栅耦合附加腔被动锁模激光器进行了详细分析 ,得到了附加腔锁模激光器的振荡条件。研究表明在稳定工作状态下 ,附加腔锁模激光器的增益、损耗、两腔之间的耦合效率以及激光振荡波长等参数在复平面上将构成一个近似的等腰三角形。对振荡初期增益的研究表明 ,主腔增益在光纤光栅中心波长两侧有明显的不对称性 ,这将会造成激光器输出光脉冲光谱的不对称性。对谐振腔的进一步分析表明 ,由于光波在光纤光栅中具有一定的穿透深度 ,为了实现激光振荡 ,两谐振腔的名义长度差需要保持一个确定的值

Analysis of Fiber-grating Additive-pulse Mode-locked Fiber Laser

Fiber-grating additive-pulse mode-locked fiber laser is analyzed in detail. The oscillation conditions for the additive-pulse mode-locked laser was found, it was showed that after reaching stable, the laser′s gain, the loss, the coupling efficiency between the two cavities, and the oscillation wavelength will construct an approximate isosceles triangle on the complex plane. Further analysis of the gain of the laser on the starting stage showed that the gain at the main cavity is unsymmetrical with the central wavelength of fiber gratings, which leads the unsymmetry of the spectrum of the output laser pulses. It was also found that in order to realize the laser oscillation the differences between the two cavities′ nominal length should be adjusted at a certain value because of the light penetration into the fiber gratings.