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Related Experiment Video

Updated: May 31, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

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

Published on: November 22, 2019

Coherent combining of a 4 kW, eight-element fiber amplifier array.

C X Yu1, S J Augst, S M Redmond

  • 1Lincoln Laboratory, Massachusetts Institute of Technology, 244 Wood Street, Lexington, Massachusetts 02420, USA. chars@ll.mit.edu

Optics Letters
|July 19, 2011
PubMed
Summary

Commercial fiber amplifiers were combined to achieve 4 kW output power. This demonstrates a viable method for high-power coherent beam combining using Yb-doped fiber amplifiers.

Related Experiment Videos

Last Updated: May 31, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
08:48

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
  • Laser Technology
  • Fiber Optics

Background:

  • Yb-doped fiber amplifiers are crucial components in modern laser systems.
  • Coherent beam combining (CBC) is a key technique for achieving high output power while maintaining good beam quality.

Purpose of the Study:

  • To characterize commercial Yb-doped fiber amplifiers for CBC applications.
  • To demonstrate the feasibility of coherently combining multiple fiber amplifiers.
  • To evaluate the performance of a tiled-aperture CBC system.

Main Methods:

  • Characterization of individual 0.5 kW Yb-doped fiber amplifiers.
  • Coherent beam combining of eight fiber amplifiers using a tiled-aperture configuration.
  • Measurement of combining efficiency and beam quality (power-in-the-bucket) at full power.

Main Results:

  • Commercial 0.5 kW Yb-doped fiber amplifiers are suitable for CBC.
  • Eight amplifiers were combined with 78% efficiency, yielding 4 kW total output power.
  • The combined beam quality was 1.25 times diffraction limited at full power.
  • Beam-combining performance remained consistent across different output power levels.

Conclusions:

  • Successful demonstration of high-power coherent beam combining using commercial Yb-doped fiber amplifiers.
  • The tiled-aperture configuration achieved high efficiency and good beam quality.
  • The results indicate the scalability and robustness of this CBC approach for high-power laser systems.