研究目的
To obtain broadly tunable narrow-linewidth generation in a self-sweeping fiber laser by combining the broadband tunability of a Lyot filter and an adaptive filter based on dynamic grating.
研究成果
Narrow-line self-sweeping fiber lasers are a cheap alternative to actively tunable laser sources. Implementation of a tunable Lyot filter with an FSR of 75 nm makes the self-sweeping range two times narrower (about ~10 nm), but gives us the possibility to tune the borders of the self-sweeping operation between 1045 and 1087 nm. Moreover, synchronization of the wavelength self-sweeping and tuning of the Lyot filter allows us to obtain a single long scan (42 nm) in this range.
研究不足
The sweeping range is mainly limited by the spectral uniformity of the gain and cavity losses ratio. The Peltier element does not allow for instant changes in its temperature for the realization of a wavelength jump from beginning to end of the sweeping region.
1：Experimental Design and Method Selection:
The laser was based on polarization maintaining (PM) fiber components, combining the broadband tunability of a Lyot filter and an adaptive filter based on dynamic grating.
2：Sample Selection and Data Sources:
The active medium was a Yb-doped double cladding fiber (PM-YDF-5/130, Nufern) with a length of
3：6 m. List of Experimental Equipment and Materials:
A laser diode with a wavelength of about 975 nm, a pump combiner, a polarizing fiber loop mirror (FLM), a cleaved fiber end, a 95/5 coupler, a laser spectrum analyser (LSA, HighFinesse), an optical spectrum analyzer (AQ6370, Yokogawa), a Peltier element, and a radiator.
4：Experimental Procedures and Operational Workflow:
The laser cavity was formed by a FLM and a cleaved fiber end. A fraction of out-coupled through a 95/5 coupler radiation was used for analysis. The total cavity length was about 9 meters. The laser was generated in a self-induced wavelength sweeping regime.
5：Data Analysis Methods:
The wavelength dynamic was analyzed with a laser spectrum analyser (LSA, HighFinesse). The reflection spectrum shape of the filter was measured with an optical spectrum analyzer (AQ6370, Yokogawa).
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