[18a-W9_326-1~9] 3.5 Ultrashort-pulse and high-intensity lasers

10:00 AM - 10:15 AM JST(1:00 AM - 1:15 AM UTC)English Presentation

[18a-W9_326-5] Numerical Study of Intensity Noise Characteristics of the Soliton Self-Frequency Shift

〇Kejia Zeng¹, Satoshi Ashihara¹ (1.IIS)

Keywords:

Soliton self-frequency shift,Intensity noise

Soliton self-frequency shift (SSFS) in nonlinear fluoride fibers is a promising technique for generating ultrashort mid-infrared pulses for spectroscopic applications, where intensity noise critically limits the signal-to-noise ratio. In this work, we numerically investigate the intensity-noise characteristics of mid-infrared Raman solitons generated through SSFS, with particular emphasis on their dependence on input power and propagation length. Pulse propagation is simulated using the generalized nonlinear Schrödinger equation with a Gaussian-distributed pump-power ensemble to model pulse-energy fluctuations. The results show that the relative intensity noise (RIN) decreases during the SSFS process and reaches a stable level after Raman soliton formation. This RIN suppression is strongly correlated with soliton fission dynamics and the emergence of a stable Raman soliton, indicating that soliton stability plays a key role in reducing intensity noise in SSFS-based mid-infrared sources.