研究目的
To investigate the self-emergence of noise-like pulses in ultrafast fiber lasers using the time-stretch dispersive Fourier transform (DFT) and compare the buildup dynamics in both anomalous and normal-dispersion fiber lasers.
研究成果
The buildup dynamics of noise-like pulses in both anomalous and normal-dispersion fiber lasers reveal markedly different stages and timescales in the evolution process. In normal dispersion, the buildup includes several initial stages leading to long-lived small pulses and finally to the emergence of NLP from a dominant precursor pulse. In contrast, the laser operating in the anomalous dispersion regime yields dynamics influenced by soliton shaping effects, resulting in a bunch of soliton pulses in a chaotic relative motion.
研究不足
The study is limited to the observation of noise-like pulses in a specific setup of a unidirectional erbium doped fiber ring laser and may not cover all possible configurations or types of ultrafast lasers.
1：Experimental Design and Method Selection:
The study uses a unidirectional erbium doped fiber ring laser incorporating nonlinear polarization evolution for instantaneous saturable absorption. A short segment of dispersion-compensating fiber (DCF) controls the net laser dispersion. The time-stretch dispersive Fourier transform (DFT) is employed to record pulse spectral and temporal information in real time over successive cavity roundtrips.
2：Sample Selection and Data Sources:
The study focuses on the emission of noise-like pulses at a pump power of 400mW in both normal and anomalous dispersion regimes.
3：List of Experimental Equipment and Materials:
A unidirectional erbium doped fiber ring laser, dispersion-compensating fiber (DCF), a 6.3-km long DCF for pulse stretching, a fast photodiode, and a 6-GHz real-time oscilloscope.
4：3-km long DCF for pulse stretching, a fast photodiode, and a 6-GHz real-time oscilloscope.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser output pulses are stretched in the far-field dispersion regime through a 6.3-km long DCF, mapping their spectra onto the temporal domain, which is recorded by a fast photodiode and a 6-GHz real-time oscilloscope.
5：3-km long DCF, mapping their spectra onto the temporal domain, which is recorded by a fast photodiode and a 6-GHz real-time oscilloscope.
Data Analysis Methods:
5. Data Analysis Methods: The evolution of the temporal intensity profile and spectral real-time recordings from DFT are analyzed, along with autocorrelation trace and optical spectrum in the established NLP regime.
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