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Related Experiment Video

Updated: May 15, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

Mode-converters for rectangular-core fiber amplifiers to achieve diffraction-limited power scaling.

Arun Kumar Sridharan¹, Paul H Pax, John E Heebner

¹Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550, USA. sridharan1@llnl.gov

|December 25, 2012

Summary

This summary is machine-generated.

Researchers developed a novel diffractive optic system to convert light modes for high-power fiber amplifiers. This technique efficiently converts between the fundamental TEM(00) mode and higher-order modes (HOM) in ribbon fibers, achieving record efficiencies.

Related Experiment Videos

Last Updated: May 15, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

Published on: November 22, 2019

Area of Science:

Optics and Photonics
Fiber Lasers and Amplifiers
Mode Conversion Technology

Background:

Rectangular-core (ribbon) fibers offer potential for higher average power scaling compared to traditional circular-core fibers.
Efficient interfacing of ribbon fiber amplifiers with standard laser sources and applications requires effective mode conversion.
Existing methods for mode conversion in such systems are limited.

Purpose of the Study:

To demonstrate a novel mode conversion technique for interfacing TEM(00) mode seed sources with higher-order mode (HOM) ribbon fiber amplifiers.
To achieve efficient conversion of HOM back to a diffraction-limited TEM(00) mode for end-user applications.
To present the first simulation and experimental validation of this diffractive optic-based mode conversion system.

Main Methods:

Utilized two diffractive optic elements positioned in conjugate Fourier planes for mode conversion.
Simulated the conversion of a diffraction-limited TEM(00) mode to the HOM of a ribbon fiber.
Experimentally demonstrated the conversion of a single HOM in a ribbon fiber back to a TEM(00) mode.

Main Results:

Achieved approximately 84% mode conversion efficiency from TEM(00) to HOM, with theoretical potential approaching 100%.
Demonstrated a record 80.5% conversion efficiency for converting HOM back to a diffraction-limited TEM(00) mode.
Validated the effectiveness of the diffractive optic approach for high-power fiber amplifier interfacing.

Conclusions:

The developed diffractive optic system provides an efficient solution for mode conversion in ribbon fiber amplifiers.
This technology enables the use of ribbon fibers for high-power laser applications requiring specific mode outputs.
The demonstrated efficiencies represent a significant advancement in the field of fiber optic mode manipulation.