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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

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Published on: July 12, 2017

Brightness enhancement in a high-peak-power cladding-pumped Raman fiber amplifier.

Arun Kumar Sridharan¹, John E Heebner, Michael J Messerly

¹National Ignition Facility and Photon Science Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA. sridharan1@llnl.gov

|October 14, 2009

Summary

This study presents a cladding-pumped Raman fiber amplifier (CPRFA) achieving record-breaking peak power and brightness enhancement. The amplifier

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Area of Science:

Optics and Photonics
Fiber Lasers and Amplifiers

Background:

Cladding-pumped fiber amplifiers offer high power capabilities.
Raman fiber amplifiers provide wavelength flexibility and high gain.
Optimizing amplifier design is crucial for enhancing output brightness.

Purpose of the Study:

To demonstrate a cladding-pumped Raman fiber amplifier (CPRFA).
To investigate the impact of the cladding-to-core diameter ratio on amplifier performance.
To achieve high peak power and brightness enhancement in a CPRFA.

Main Methods:

Utilized a pump-signal combiner for independent coupling of pump and signal.
Spliced the combiner output to a Raman amplifier fiber.
Characterized the amplifier's output energy, pulse duration, repetition rate, and peak power.

Main Results:

Generated 20 microJ, 7 ns pulses at 1100 nm with a 2.2 kHz repetition rate.
Achieved 2.77 kW amplified signal peak power from 300 microJ input pump energy (25.1 kW peak power).
Demonstrated a brightness-enhancement factor of 192, the highest reported for a CPRFA.

Conclusions:

The cladding-to-core diameter ratio significantly influences the brightness-enhancement factor in CPRFAs.
The developed CPRFA exhibits state-of-the-art peak power and brightness enhancement.
This work advances the capabilities of fiber-based amplification systems.