研究目的
Investigating the effects of a weak coherent femtosecond pulse seed on the continuous wave pumped supercontinuum generation to improve spectral bandwidth and pulse-to-pulse stability.
研究成果
The introduction of a weak coherent fs pulse seed significantly improves the properties of CW pumped SC, including spectral bandwidth, coherence, and SNR. The frequency shift and peak power of the seed are critical parameters that influence the SC generation. The optimized frequency range for the seed pulse is identified as ΩM < Ω < 1.5 ΩM. This approach offers a promising method for generating stable and broad SC with enhanced characteristics.
研究不足
The study is numerical and relies on simulations, which may not fully capture all real-world complexities. The effectiveness of the seed pulse is dependent on its frequency shift and peak power, which may require precise control in practical applications.
1：Experimental Design and Method Selection:
The study uses the generalized nonlinear Schr?dinger equation (GNLSE) to model the SC generation in the optical fiber. The numerical solution involves the split-step method and 4th order Runge–Kutta method.
2：Sample Selection and Data Sources:
The pump source is an ideal CW of constant power P0 = 6 W in time domain with center frequency w0 corresponding to wavelength 1486 nm. A weak fs pulse seed is introduced with varying frequency shifts and peak powers.
3：List of Experimental Equipment and Materials:
A 400 m long highly nonlinear, dispersion shifted fiber is used with parameters b2 = -0.17 ps^2/km, b3 = 0.0393 ps^3/km, γ = 15 W^-1km^-1, and α = 10 dB/km.
4：17 ps^2/km, b3 = 0393 ps^3/km, γ = 15 W^-1km^-1, and α = 10 dB/km.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The input pulse shot noise is modeled semi-classically by adding a noise seed of one photon per mode with random phase on each spectral discretization bin. The dynamics of SC generation are analyzed with and without the fs pulse seed.
5：Data Analysis Methods:
The properties of SC, such as bandwidth, coherence, and SNR, are analyzed by varying the frequency shift and peak power of the seed.
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