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Title: 10W single-mode Nd+3 fiber laser at 1428nm

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Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
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Conference: Presented at: SPIE Photonics West, San Francisco, CA, United States, Jan 27 - Feb 01, 2018
Country of Publication:
United States

Citation Formats

Khitrov, V V, Kiani, L S, Pax, P H, Drachenberg, D R, Messerly, M J, Crist, R P, Schenkel, N, Cook, M, and Dawson, J W. 10W single-mode Nd+3 fiber laser at 1428nm. United States: N. p., 2017. Web.
Khitrov, V V, Kiani, L S, Pax, P H, Drachenberg, D R, Messerly, M J, Crist, R P, Schenkel, N, Cook, M, & Dawson, J W. 10W single-mode Nd+3 fiber laser at 1428nm. United States.
Khitrov, V V, Kiani, L S, Pax, P H, Drachenberg, D R, Messerly, M J, Crist, R P, Schenkel, N, Cook, M, and Dawson, J W. 2017. "10W single-mode Nd+3 fiber laser at 1428nm". United States. doi:.
title = {10W single-mode Nd+3 fiber laser at 1428nm},
author = {Khitrov, V V and Kiani, L S and Pax, P H and Drachenberg, D R and Messerly, M J and Crist, R P and Schenkel, N and Cook, M and Dawson, J W},
abstractNote = {},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month =

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  • An efficient and practical laser diode module is demonstrated forsingle-mode fiber applications. The module is developed through use of anearlier proposed combination lens method, where a hemispherical ended gradedindex rod lens and virtual fiber are employed. Since lens and virtual fibermisalignment tolerances are large in this coupling method, the YAG laser weldingtechnique is easily applicable. This laser diode module has not only a simplestructure but also high coupling efficiency, excellent reproducibility, andextremely high reliability.
  • We have proposed and demonstrated a novel switchable single-longitudinal-mode (SLM), dual-wavelength erbium-doped fiber laser (DWEDFL) assisted by Rayleigh backscattering (RBS) in a tapered fiber in a ring laser configuration. The RBS feedback in a tapered fiber is a key mechanism as linewidth narrowing for laser output. A compound laser cavity ensured that the EDFL operated in the SLM state and a saturable absorber (SA) is employed to form a gain grating for both filtering and improving wavelength stability. The fiber laser can output dual wavelengths simultaneously or operate at single wavelength in a switchable manner. Experiment results show that withmore » the proper SA, the peak power drift was improved from 1–2 dB to 0.31 dB and the optical signal to noise ratio was higher than 60 dB. Under the assistance of RBS feedback, the laser linewidths are compressed by around three times and the Lorentzian 3 dB linewidths of 445 Hz and 425 Hz are obtained at 1550 nm and 1554 nm, respectively.« less
  • The investigation of the induced loss for a single mode (SM) optical fiber under ..gamma..-ray irradiation and neutron irradiation are described and the estimation method for induced loss with low dose rate and long-term ..gamma..-ray irradiation is proposed. The induced loss of pure silica core SM fiber was estimated to be 50 times lower than that of germanium containing silica core SM fiber after irradiation with 1 R/Hr for 25 years.
  • The authors report the development of a tunable bandwidth source based on self-phase modulation of two frequencies in an optical fiber. A single frequency pulse was obtained by placing a 688 {mu}m etalon with finesse = 3.3 in a single mode, single frequency Q-switched ND:YLF oscillator. Angle tuning of the etalon allowed continuous frequency tuning of the oscillator by {+-} 2.5 {angstrom} about the central frequency of 10,530.3 {angstrom}. Two oscillators were modified and tuned to 10,532.8 {angstrom} and 10,527.8 {angstrom}, respectively. Additional tests performed with a 344 {mu}m etalon allowed tuning of {+-}5 {angstrom}, but with reduced output energymore » and stability ({+-} 20%); however, pulse to pulse energy fluctuations can be compensated for by the use of a pulse energy regulator if a broader range of tunability is required. The output beams were temporally and spatial overlapped, and shortened to an 11 ns nominally square pulse with a 3 ns rise and fall via a Pockels cell. Two Pockels cells were required to reduce nonlinear effects in the fiber due to prelase signal. The two frequencies were coupled into a 10 m single-mode polarization preserving fiber with a 4.2 x 7.4 {mu}m core diameter and an effective mode area of 64 {mu}m. The beam energy was recorded at the input and output of the fiber. The output spectrum was recorded with a spectrometer/optical multichannel analyzer, and the temporal pulse shape of each frequency was recorded by spectrally dispersing the far field beam and re-imaging it onto a streak camera.« less
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