12W laser amplification at 1427nm on the 4F3/2 to 4I13/2 spectral line in an Nd3+ doped fused silica optical fiber

Dawson, Jay W.; Pax, Paul H.; Allen, Graham S.; Drachenberg, Derrek R.; Khitrov, Victor V.; Schenkel, Nick; Messerly, Michael J.

doi:10.1364/OE.24.029138

Title: 12W laser amplification at 1427nm on the ⁴F_3/2 to ⁴I_13/2 spectral line in an Nd³⁺ doped fused silica optical fiber

Journal Article · Wed Dec 07 23:00:00 EST 2016 · Optics Express

DOI: https://doi.org/10.1364/OE.24.029138 · OSTI ID:1338897

Dawson, Jay W. ^[1]; Pax, Paul H. ^[1]; Allen, Graham S. ^[1]; Drachenberg, Derrek R. ^[1]; Khitrov, Victor V. ^[1]; Schenkel, Nick ^[1]; Messerly, Michael J. ^[1]

Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

A 9.3dB improvement in optical gain and a 100x improvement in total optical power over prior published experimental results from the ⁴F_3/2 to ⁴I_13/2 transition in an Nd³⁺ doped fused silica optical fiber is demonstrated. This is enabled via an optical fiber waveguide design that creates high spectral attenuation in the 1050-1120nm-wavelength range, a continuous spectral filter for the primary ⁴F_3/2 to ⁴I_11/2 optical transition. A maximum output power at 1427nm of 1.2W was attained for 43mW coupled seed laser power and 22.2W of coupled pump diode laser power at 880nm a net optical gain of 14.5dB. Reducing the coupled seed laser power to 2.5mW enabled the system to attain 19.3dB of gain for 16.5W of coupled pump power. Four issues limited results; non-optimal seed laser wavelength, amplified spontaneous emission on the ⁴F_3/2 to ⁴I_9/2 optical transition, low absorption of pump light from the cladding and high spectral attenuation in the 1350-1450nm range. Lastly, future fibers that mitigate these issues should lead to significant improvements in the efficiency of the laser amplifier, though the shorter wavelength region of the transition from 1310nm to >1350nm is still expected to be limited by excited state absorption.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1338897

Report Number(s):: LLNL-JRNL--702161

Journal Information:: Optics Express, Journal Name: Optics Express Journal Issue: 25 Vol. 24; ISSN 1094-4087; ISSN OPEXFF

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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Status of NIF laser and high power laser research at LLNL Bowers, Mark; Wisoff, Jeff; Herrmann, Mark SPIE LASE, SPIE Proceedings https://doi.org/10.1117/12.2257571	conference	February 2017
E-band neodymium-doped fiber amplifier: model and application Boley, Charles D.; Dawson, Jay W.; Kiani, Leily S. Applied Optics, Vol. 58, Issue 9 https://doi.org/10.1364/ao.58.002320	journal	January 2019
E-band Nd^3+ amplifier based on wavelength selection in an all-solid micro-structured fiber Dawson, Jay W.; Kiani, Leily S.; Pax, Paul H. Optics Express, Vol. 25, Issue 6 https://doi.org/10.1364/oe.25.006524	journal	January 2017

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Title: 12W laser amplification at 1427nm on the 4F3/2 to 4I13/2 spectral line in an Nd3+ doped fused silica optical fiber

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Title: 12W laser amplification at 1427nm on the ⁴F_3/2 to ⁴I_13/2 spectral line in an Nd³⁺ doped fused silica optical fiber