Plane-by-plane femtosecond laser inscription of first-order fiber Bragg gratings in fluoride glass fiber for in situ monitoring of lasing evolution

Kenji Goya, Hiraku Matsukuma, Hiyori Uehara, Satoshi Hattori, Christian Schäfer, Daisuke Konishi, Masanao Murakami, Shigeki Tokita

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report the femtosecond laser inscription of fiber Bragg gratings (FBGs) in an Er-doped fluoride glass fiber used for lasing at a mid-infrared wavelength of 2.8 µm. The lasing evolution is discussed in terms of the FBG reflectivity, wavelength transition to the Bragg wavelength, and output power of the mid-infrared fiber laser. A first-order and short (2.5-mm-long) Bragg grating showed a reflectivity of 97%, because of a laser-induced index modulation of 1.1 × 103. This modulation was sufficient to saturate this system’s output power. The laser oscillator is designed to lase in the atmospheric window of 2799–2800 nm slope. Further, this oscillator’s efficiency is as high as 29.1% for the launched pump power over the range of 0.4–4.6 W and at a lasing wavelength of 2799.7 nm. This oscillator also exhibited a FWHM bandwidth of 0.12 nm.

Original languageEnglish
Pages (from-to)33305-33313
Number of pages9
JournalOptics Express
Volume26
Issue number25
DOIs
Publication statusPublished - 2018 Dec 10
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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