回音壁模式光学微腔的激发模式控制

Controllable Excitation of Whispering Gallery Mode Micro-Rod Resonator

利用二氧化碳激光器在熔融石英棒上加工出具有超高品质因子的微棒腔,并研究了微腔的曲率、耦合位置以及耦合位置处锥形光纤的半径对激发的模式数量、品质因子以及耦合效率的影响。通过优化加工和耦合过程中的参数,在保证超高品质因子的同时激发出少量模式,有效避免了模式重叠,从而在不同波长下产生了具有频谱光滑包络的孤子光频梳。

We fabricate a micro-rod cavity with an ultrahigh Q-factor on a fused silica rod via CO2 laser,and investigate the effects of micro-rod curvature,coupling position,and radius of tapered fiber at coupling position on number of excited modes,Q-factor and coupling efficiency.Through optimizing the parameters in the fabrication and coupling process and exciting a few modes with ultrahigh quality factors,one can avoid mode crossing,thus generate a soliton frequency comb with a smooth envelope at different wavelengths.