Characterization of sub-nanosecond pulsed laser amplification with Er:Yb co-doped phosphate glass fibers

Omri Moschovitz, Nadia G. Boetti, Diego Pugliese, Duccio Gallichi-Nottiani, Daniel Milanese, Davide Janner, Amiel A. Ishaaya

Research output: Contribution to journalArticlepeer-review

Abstract

We present an experimental characterization of the amplification of sub-nanosecond duration laser pulses at a wavelength of 1538 nm in short custom-made Er:Yb phosphate glass fibers with different core diameters. The fibers vary in their diameter from 100 µm (highly multi-mode) down to 12 µm (single-mode). The peak power, energy per pulse, and spectral shape of the amplified signal are presented. With our input pulses, the measurements show that the large core diameter fibers do not increase the amplification of the 1538 nm signal. We believe this is due to the high re-absorption of the Er3+ ions in the phosphate fiber. The optimal fiber geometry was found to have a core diameter of 20 µm with a length of 14 cm. The maximum peak power is 8.25 kW, corresponding to a net gain of 10.9 dB, with a pulse duration of 0.7 ns and a repetition rate of 40 kHz.

Original languageEnglish
Pages (from-to)5291-5294
Number of pages4
JournalOptics Letters
Volume45
Issue number18
DOIs
StatePublished - 15 Sep 2020

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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