Efficient point-by-point Bragg gratings fabricated in embedded laser-written silica waveguides using ultrafast Bessel beams

G. Zhang, G. Cheng, M. Bhuyan, C. D’Amico, R. Stoian

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

We demonstrate highly efficient Bragg gratings written point-by-point by sequential single-pulse ultrashort Bessel laser beams in laser photoinscribed single-mode waveguides in bulk fused silica. The use of chirped non-diffractive Bessel beams determines a strong Bragg resonance in a weak-to-strong transitional regime, augmenting to a record value of 40 dB∕cm at 1550 nm in the third order. The Bessel-induced refractive index modulation is negative and localized to sub-micrometer (200 nm) transverse scales. The strong light confinement in Bessel beams ensuring uniform one-dimensional void conditions thus allows for enhanced precision in the Bragg grating waveguide design. We demonstrate flexible fabrication of multiplexed waveguide gratings for multiple and tunable spectral resonances.

Original languageEnglish
Pages (from-to)2161-2164
Number of pages4
JournalOptics Letters
Volume43
Issue number9
DOIs
StatePublished - 1 May 2018
Externally publishedYes

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