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Related Experiment Video

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

Compensation of frequency modulation to amplitude modulation conversion in frequency conversion systems.

Steve Hocquet¹, Geoffrey Lacroix, Denis Penninckx

¹Commissariat à l'Energie Atomique/Centre d'études scientifiques et techniques d'Aquitaine, 15 avenue des sablières, BP 2, 33114 Le Barp, France. steve.hocquet@cea.fr

|May 5, 2009

Summary

Frequency modulation to amplitude modulation (FM-to-AM) conversion is a key challenge for high-power lasers like the Laser MegaJoule (LMJ). This study proposes linear transfer functions to reduce FM-to-AM distortion, significantly improving laser performance.

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Area of Science:

High-power laser physics
Nonlinear optics
Fusion energy research

Background:

Frequency modulation to amplitude modulation (FM-to-AM) conversion is a critical issue impacting high-power laser systems, such as the Laser MegaJoule (LMJ).
This conversion primarily occurs within the nonlinear frequency conversion and focusing systems of these lasers, posing a significant barrier to achieving fusion ignition.
Understanding and mitigating FM-to-AM conversion is essential for advancing laser-driven fusion energy.

Purpose of the Study:

To develop and propose effective compensation strategies for FM-to-AM conversion in high-power laser systems.
To investigate the efficacy of linear transfer functions in mitigating amplitude modulation distortions caused by frequency conversion.
To quantify the reduction in FM-to-AM conversion levels achievable with the proposed compensation methods.

Main Methods:

Development of linear transfer functions designed to counteract the nonlinear effects leading to FM-to-AM conversion.
Implementation and testing of these compensation systems within a simulated high-power laser environment.
Experimental validation of the proposed methods across a range of beam intensities, up to 3 GW/cm(2).

Main Results:

The proposed linear transfer functions significantly reduce FM-to-AM conversion levels.
For beam intensities up to 3 GW/cm(2), the FM-to-AM conversion level was reduced by at least a factor of two.
Near-complete cancellation of intensity modulation was achieved for beam intensities below 1 GW/cm(2).

Conclusions:

Linear transfer functions offer a practical and effective solution for compensating FM-to-AM conversion in high-power laser systems.
The proposed compensation strategy can substantially improve the beam quality and reliability of lasers like the LMJ.
This work contributes to overcoming a major obstacle in the pursuit of laser-based fusion ignition.