论文部分内容阅读
降低阈值是随机激光实用化的前提,随机光纤激光器是将随机增益介质填充到空芯光子晶体光纤中利用其光子禁带来降低阈值的一种随机激光器.理论分析表明:在光子晶体光纤光子禁带的约束下,随机光纤激光器中的大部分能量被集中在芯区传播,这使局域在芯区的光与随机介质相互作用得到增强,激发效率得以提高.然而,光纤填充介质后,纤芯等效折射率发生了改变,光子带隙也会随之移动,因此当选用带隙光纤来降低阈值时,只考虑光纤本身的带隙是不够的,应考虑到介质的增益频率和填充后的光子带隙之间的匹配问题,合理选择光纤或介质的材料,如果匹配得当,光子禁带对激光的调控能力会更强,激光阈值有望得到更大程度的降低.
The threshold reduction is the premise of the practical use of stochastic laser, which is a kind of stochastic laser that uses stochastic gain medium to fill the hollow core photonic crystal fiber and uses its photon forbidden band to lower the threshold. Theoretical analysis shows that in the photonic crystal fiber photon ban Band constraint, most of the energy in the stochastic fiber laser is concentrated in the core region, which enhances the local light interaction with the stochastic medium in the core region and enhances the excitation efficiency. However, after the fiber is filled with the medium, the fiber Core equivalent refractive index has changed, the photonic bandgap will also move, so the choice of bandgap fiber to lower the threshold, only consider the optical fiber’s bandgap is not enough, should take into account the media gain frequency and after filling Photonic bandgap matching problem, a reasonable choice of optical fiber or media material, if properly matched, photon forbidden band on laser regulation ability will be stronger, the laser threshold is expected to be more reduced.