研究目的
Development of stable, reliable and wavelengths flexible dissipative soliton (DS) fiber lasers for practical uses.
研究成果
In conclusion, we demonstrated a Raman DS mode locked fiber laser with an all PM cavity. The Raman laser is mode locked by a NOLM. An all-fiber Lyot filter is inserted in the cavity to bring in the DS mechanism. Raman DS pulses with 1.23 nJ pulse energy and 69 ps pulse width under 1.23 MHz repetition rate are obtained. RF SNR of the Raman DS pulse is as high as 85 dB, which indicates an excellent performance of the DS pulse train in temporal stability. It is the first report of Raman DS generation from a NOLM mode locked fiber laser and an all PM mode locked fiber laser to the best of our knowledge. This configuration provides a new method to obtain high performance linear polarized ultrafast laser at flexible wavelengths.
研究不足
The technical and application constraints of the experiments, as well as potential areas for optimization, are not explicitly mentioned in the paper.
1：The Raman laser has a figure-8 cavity, which is formed by a unidirectional ring and a NOLM ring. In the unidirectional ring, an ASE source at 1064 nm with high temporal stability is used as the pump source to generate stable Raman laser. Three 1064/1120 nm wavelength division multiplexers (WDM) are used to couple the pump laser into the cavity and remove the residual pump after the Raman gain medium. The Raman gain medium is a piece of PM Raman fiber in a length of 80 m. A polarization dependent isolator is used to ensure unidirectional light propagation and also works as a polarizer. A
25 PM coupler is used to extract the Raman laser from the cavity. Between the isolator and the output coupler, a short piece of PM980 fiber is inserted with a spliced angle of 45° at both ends; it works together with the isolator to act as an all-fiber Lyot filter. Another PM fiber coupler with a splitting ratio of 20:80 is adopted to connect the NOLM ring and the unidirectional ring. The length of the NOLM ring is about 77 m. The whole laser setup is in an all PM configuration and the overall cavity length is about 170 m.
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