Frequency stabilized ultra-low-noise DFB fiber laser based on intracavity dual mode frequency self-reference mechanism

Single frequency laser sources with high frequency stabilization serve as the backbone for the fields from advanced scientific experiments to industrial or commercial applications, thanks to the rapid development of laser frequency stabilization techniques based on optical or electrical feedback from an external reference. Despite the tremendous progress, it still remains an open question as to how to realize a laser source that can reach the high frequency stabilization and still remain sufficiently compact and portable for field use, with the increasing interest in applying these systems outside of the laboratory. Here, we describe a frequency stabilization DFB fiber laser with intracavity frequency reference mechanism, by utilizing the beat note of dual modes inside the laser cavity as the laser wavelength drift reference signal. As one of the best results for the laser frequency stabilization without the external frequency reference, the outcome of this work presents a way to achieve a stable laser source as an alternative to the laser-locked to absorption line or FP cavity design with a simpler, lower cost feature, offering promising prospects for versatile applications outside of the laboratory.