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Maximum Power Transfer

Maximum Power Transfer

Numerous practical applications within engineering disciplines, such as telecommunications, necessitate optimizing power delivery to a connected load. This pursuit, however, entails inherent internal losses, which can either equal or exceed the power supplied to the load. The Thevenin equivalent circuit is helpful in finding the maximum power a linear circuit can deliver to a load. It is assumed in this context that the load resistance can be adjusted.
By substituting the entire circuit with...

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Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

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Published on: August 5, 2013

Wavefront shaping enables high-power multimode fiber amplifier with output focus.

Stefan Rothe¹, Chun-Wei Chen^1,2, Peyman Ahmadi^1,3

¹Department of Applied Physics, Yale University, New Haven, CT, USA.

Science (New York, N.Y.)

|October 9, 2025

Summary

This study suppresses stimulated Brillouin scattering in high-power fiber lasers using a multimode amplifier. Spatial wavefront shaping achieves a diffraction-limited spot, enabling high-power, efficient, and coherent laser amplification.

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Area of Science:

Optics and Photonics
Laser Physics

Background:

High-power fiber lasers are crucial for science, industry, and defense.
Stimulated Brillouin scattering (SBS) limits power scaling in single-frequency fiber laser amplifiers.
Previous mitigation strategies focused on single-mode or few-mode fibers, limiting power scalability.

Purpose of the Study:

To explore a highly multimode fiber amplifier for suppressing stimulated Brillouin scattering.
To investigate the use of spatial wavefront shaping for coherent control of multimode laser amplification.
To achieve high-power, efficient, and narrow-linewidth output from a fiber laser amplifier.

Main Methods:

Utilized a highly multimode fiber amplifier design.
Implemented a spatial wavefront shaping technique on the input light.
Analyzed SBS suppression through reduced light intensity and spectral broadening in a large fiber core.

Main Results:

Achieved significant suppression of stimulated Brillouin scattering in the multimode fiber amplifier.
Demonstrated focusing of the amplified output beam to a diffraction-limited spot using wavefront shaping.
Obtained high-power, high-efficiency, and narrow-linewidth laser output, ensuring high coherence.

Conclusions:

Multimode fiber amplifiers, combined with wavefront shaping, effectively suppress SBS for power scaling.
Optical wavefront shaping provides coherent control over multimode laser amplification.
Potential applications include coherent beam combining, large-scale interferometry, and directed energy delivery.