谐波锁模掺铒光纤激光器的稳定性研究

对谐波锁模掺铒光纤激光器的稳定性进行了实验研究.采用再生锁模技术控制腔长变化对稳定性的影响,提出了在腔内利用缠绕光纤法替代保偏光纤以获取偏振稳定机制的方案,并进行了相关实验.利用自相位调制＋频谱滤波抑制超模噪音,实验中当抽运功率在50 mW以上时就足可以抑制超模噪音.实验结果表明:采用以上三种措施能够较好地解决影响谐波锁模光纤激光器稳定的温漂、偏振起伏和超模噪音问题,从而大大提高了谐波锁模光纤激光器的稳定性.

Study on Stability of Harmonic Mode Locked Fiber Laser

The stability of harmonic mode locked fiber laser (HMLFL) was studied.The influence of cavity length variety on stability could be controlled by using regenerative mode locking technique.The method of introducing polarization stable mechanism to improve system stability other than using polarization maintaining fibers was presented and tested,which was achieved by coiling the fiber round a small radius plate.Supermode depression was realized by introducing additive pulse limiting effect using self phase modulation induced spectral spreading in dispersion shifted fiber and spectral bandpass filtering simultaneously.Supermode noise can be depressed enough when the pump power was 50 mW.It is shown that temperature changes,polarization perturbation,and supermode noise,which make the HMLFL operates unsteadily,could be controlled successfully by using above three methods,so the stability of HMLFL could be improved greatly.