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.
Low noise laser sources with narrow linewidth and low intensity noise are key tools in a broad range of applications such as optical sense, microwave photonics, coherent optical communications and so on. The report gives an introduction about our research progress of the narrow-linewidth single frequency DFB fiber lasers. An internally developed DFB fiber laser is developed. The noise characteristic of laser output is studied in detail. The frequency noise in low Fourier frequency is reduced via using the low noise pump and intracavity optical negative feedback. Furthermore, an injecting lock scheme is used to reduce the intensity noise. A fiber laser output with low frequency noise and low intensity noise has been demonstrated.
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