3D laser-written silica glass step-index high-contrast waveguides for the 3.5 µm mid-infrared range.
Opt Lett
; 40(24): 5818-21, 2015 Dec 15.
Article
en En
| MEDLINE
| ID: mdl-26670520
ABSTRACT
We report on the direct laser fabrication of step-index waveguides in fused silica substrates for operation in the 3.5 µm mid-infrared wavelength range. We demonstrate core-cladding index contrasts of 0.7% at 3.39 µm and propagation losses of 1.3 (6.5) dB/cm at 3.39 (3.68) µm, close to the intrinsic losses of the glass. We also report on the existence of three different laser modified SiO2 glass volumes, their different micro-Raman spectra, and their different temperature-dependent populations of color centers, tentatively clarifying the SiO2 lattice changes that are related to the large index changes.
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2015
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Article