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The physics of transverse mode instability-induced nonlinear phase distortions in large area optical fiber amplifiers and their mitigation with applications in scaling of pulsed and continuous wave high-energy lasers

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Technical Report,24 Sep 2015,26 Sep 2016

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Indian Institute of Technology Madras Chennai India

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During the reporting period, the PI investigated the use of vortex beams to mitigate thermal mode instability in high energy fiber amplifiers. The investigation is carried out through 1 the development of a comprehensive model to study and mitigate the onset of thermal mode instability in large mode area fiber amplifiers, and 2 the development of a testbed at IIT Madras to experimentally validate the above results as well as to explore the generation of vortex modes through a spiral phase plate and novel all-fiber fused coupler. Such work has laid the platform to demonstrate the mitigation of thermal mode instability through vortex beam amplification in high energy fiber amplifiers.

Subject Categories:

  • Lasers and Masers
  • Fiber Optics and Integrated Optics

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