Head of the NSU Fiber Laser Laboratory Dmitry Churkin, along with colleagues from the University Aston, Maria Sorokina and Shurikant Sugavanam, published an article about their work on a topic that is currently attracting a lot of attention, spectral correlations in a random fiber laser.
Dmitry Churkin explained that in recent years there has been a boom in research on a new type of fiber lasers, fiber lasers with random distributed feedback. “This is a new type of laser that was demonstrated by us in 2010. They are quite simple in their technical design and have a number of applications in telecommunications, sensors, and in laser technology.”
Despite a large number of fundamental and applied work in this field the processes that determine the generation spectrum for this type of laser, the main characteristics of radiation, remain largely unexplored. The NSU scientists using real-time spectrum measurement with high spectral resolution, demonstrated that contrary to expectations and outside the existing theoretical descriptions, the generation spectrum of a random fiber laser contains ultra-narrow spectral components. Their existence indicates a significant contribution from coherent feedback in the generation formation. Therefore, as was previously assumed, the feedback in this situation is completely incoherent in nature.
This study opens up new perspectives on the management of the emission of random fiber lasers and the development of new types of lasers for sensory applications.