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Spectrally-resolved statistical characterization of seeded supercontinuum suppression using optical time-stretch.

Zhibo Ren, Yiqing Xu, Yi Qiu

|June 13, 2014

Summary

Real-time measurements of supercontinuum (SC) noise properties are now possible with optical time-stretch (OTS). This technique reveals a trade-off between SC bandwidth and spectral stability when using continuous-wave (CW) seeding.

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Area of Science:

Nonlinear Optics
Spectroscopy
Optical Engineering

Background:

Characterizing supercontinuum (SC) noise properties in real-time has been limited by ultrafast optical spectrometer technology.
Understanding SC noise is crucial for insights into spectral dynamics and developing stable SC sources.
Active seeding mechanisms for SC generation are of significant research interest.

Purpose of the Study:

To demonstrate real-time, spectrally-resolved, broadband, statistical characterization of continuous-wave (CW) seeded SC.
To investigate the impact of CW seeding on SC spectral properties and stability.
To explore the potential of optical time-stretch (OTS) for analyzing complex SC generation dynamics.

Main Methods:

Utilized an ultrahigh-speed spectral acquisition technique: optical time-stretch (OTS).
Performed real-time, spectrally-resolved, broadband, statistical characterization of CW-seeded SC.
Analyzed shot-to-shot statistics to evaluate SC bandwidth and spectral stability.

Main Results:

Demonstrated a compromise between SC bandwidth and spectral stability under CW seeding.
Identified seeding conditions for SC suppression, linked to cascaded parametric processes.
Captured real-time spectral signatures of Raman solitons using OTS at 20 MHz acquisition rate.

Conclusions:

Optical time-stretch (OTS) enables real-time statistical characterization of seeded SC.
CW seeding influences SC generation, offering a balance between bandwidth and stability.
OTS provides new insights into seeded SC mechanisms, including Raman soliton dynamics.