研究目的
Investigating the generation of J-shaped pulses in ultra-long Ytterbium-doped fiber lasers mode locked by nonlinear polarization evolution and nonlinear optical loop mirror, and understanding the pulse shaping dynamics.
研究成果
The study successfully generates J-shaped pulses in an ultra-long Ytterbium-doped fiber laser, demonstrating the influence of cavity birefringence and pump power on pulse shaping. The findings enrich the understanding of pulse dynamics in mode locked fiber lasers and suggest potential applications in material micromachining.
研究不足
The study is limited to the specific configuration of the figure-eight type Ytterbium-doped fiber laser and the effects of birefringence and pump power on pulse shaping. The numerical analysis qualitatively supports the experimental results but may not capture all complexities.
1：Experimental Design and Method Selection:
The study utilizes a figure-eight type Ytterbium-doped fiber laser mode locked by the combined effect of nonlinear polarization evolution and nonlinear optical loop mirror. Cavity birefringence based spectral filtering introduced by polarization controllers is used for pulse shaping.
2：Sample Selection and Data Sources:
The experiment involves a 70 cm long single mode Ytterbium-doped gain fiber pumped by a laser diode.
3：List of Experimental Equipment and Materials:
Equipment includes a laser diode, wavelength division multiplexer, polarization controllers, polarizing beam splitter, optical isolator, fiber collimators, single window directional coupler, and a long length of fiber spool.
4：Experimental Procedures and Operational Workflow:
The setup involves adjusting the polarization controllers to introduce birefringence and spectral filtering, varying pump power to observe different pulse shapes, and characterizing the pulses using digital storage oscilloscope, optical spectrum analyzer, and radio frequency spectrum analyzer.
5：Data Analysis Methods:
The study analyzes the temporal and spectral profiles of the pulses, correlates them with pump power and birefringence settings, and numerically investigates the spectral transmission of the resonator.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
