Abstract
For the first time, Fiber Bragg grating (FBG) structures have been inscribed in single-core passive germanate and three-core passive and active tellurite glass fibers using 800 nm femtosecond (fs) laser and phase mask technique. With fs peak power intensity in the order of 10(11)W/cm(2), the FBG spectra with 2nd and 3rd order resonances at 1540 and 1033 nm in the germanate glass fiber and 2nd order resonances at approximately 1694 and approximately 1677 nm with strengths up to 14 dB in all three cores in the tellurite fiber were observed. Thermal responsivities of the FBGs made in these mid-IR glass fibers were characterized, showing average temperature responsivity approximately 20 pm/ degrees C. Strain responsivities of the FBGs in germanate glass fiber were measured to be 1.219 pm/microepsilon.
Highlights
Germanate and tellurite glass fibers have attracted considerable attention to be explored for fiber devices in near and mid-IR regions
We demonstrate for the first time the fabrication of Fiber Bragg grating (FBG) in single-core passive germanate and three-core passive and active tellurite glass fibers by 800 nm fsinscription
The FBG structures were produced in the glass compositions (mol%): 55GeO2-30PbO-11Na2O-4Ga2O3 (GPNG) and TZN fibers using fs-inscription through a custom-designed phase mask with a period of 1697.33 nm
Summary
Germanate and tellurite glass fibers have attracted considerable attention to be explored for fiber devices in near and mid-IR regions. Their high refractive index and optical nonlinearity, resistance to corrosion, low melting temperature and good transmission properties from the visible to mid-IR region (0.35-6μm) [1] make them promising fiber hosts for bio/chemical and gas sensing [2,3], nonlinear optical signal processing [4] and optical amplifier and laser [5,6] devices. Single- and multi-core passive and active germanate and tellurite glass fibers represent a new class fiber host for devices which will extend photonics applications to mid-IR range, which is in increasing demands. Using a 1697.33 nm period phase mask, the 2nd order FBG resonances with strength up to ~14 dB have been achieved in these mid-IR fibers and their thermal and strain responsivities have been characterized
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