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- W1997678761 abstract "Femtosecond laser direct writing (FLDW) is developing rapidly but to date, there is no native optical isolator (needed tomitigate reflections in any optical system) for the platform. As a step towards integrated glass isolators, we haveinvestigated FLDW in kHz and MHz pulse rate regimes for two magneto-optical glasses (TG20 and MR3-2) toultimately create one-way structures based on the Faraday effect.Previously, we fabricated basic waveguides obtaining single-mode guidance at 632 nm (the Faraday effect is strongestnear the Tb3+ resonance at 485 nm) in both regimes. kHz regime waveguides were isotropic but had high propagationloss due to associated photodarkening (which could be post-annealed). The propagation loss of the MHz regimewaveguides was acceptable due to lower photodarkening, but the waveguides were too narrow to confine light properlybecause of the very strong focus of the writing beam.To try to combine the lower loss with larger waveguide width, we created overlapping structures using a series ofsuperposed waveguides arranged in rings in MHz regime. The confinement in these multi-ring structures was indeedimproved and the structure propagation loss was intermediate between that of one-path waveguides created in kHz andMHz regimes. For most other glasses, MHz FLDW systems operate in a heat-accumulation regime, producingwaveguide diameters much larger than the writing laser spot size and superposed waveguides that merge into one bymelting. Here, the sub-unit waveguides maintained their individual identity indicating that the heat-accumulation effectwas absent." @default.
- W1997678761 created "2016-06-24" @default.
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- W1997678761 date "2014-03-08" @default.
- W1997678761 modified "2023-09-27" @default.
- W1997678761 title "Femtosecond laser processing in magneto-optical glasses" @default.
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- W1997678761 doi "https://doi.org/10.1117/12.2038847" @default.
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