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Related Experiment Video

Updated: Jun 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Modulation instability of a coherent-incoherent mixture.

Dmitry V Dylov¹, Jason W Fleischer

¹Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544, USA.

|July 3, 2010

Summary

The nonlinear instability threshold is eliminated by any coherent light component, with the coherent fraction controlling pattern gain and period. This finding, confirmed by simulations and experiments, advances understanding of light beam interactions.

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Last Updated: Jun 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: December 3, 2013

Area of Science:

Nonlinear optics
Wave propagation physics

Background:

Partially spatially incoherent beams exhibit complex nonlinear behaviors.
Understanding modulation instability is crucial for optical system design.

Purpose of the Study:

To investigate the nonlinear coupling and modulation instability of combined coherent and partially spatially incoherent beams.
To determine the influence of the coherent component on instability thresholds and pattern formation.

Main Methods:

Derivation of perturbation growth rates using a mutual coherence approach.
Theoretical analysis of nonlinear coupling dynamics.
Validation through numerical simulations and experimental observations in photorefractive crystals.

Main Results:

The presence of any coherent light component removes the nonlinear threshold for modulation instability.
The fraction of coherent light dictates the instability gain and characteristic period of emergent patterns.
Experimental and numerical results confirm theoretical predictions.

Conclusions:

Coherent light fundamentally alters the onset and characteristics of modulation instability in partially incoherent beams.
The findings provide a theoretical and experimental framework for controlling beam dynamics in nonlinear optical media.
This research has implications for optical communications and materials processing.