Fiber Bragg grating sensor in polymer-coated ultra-thin optical fibers and method for producing same
US12164144B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 13, 2020 |
| Grant date | Dec 10, 2024 |
| Priority date | — |
| Expiry date | Dec 16, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35316
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A method and apparatus for inscribing a Bragg grating in an optical waveguide, comprising: providing electromagnetic radiation from an ultrashort pulse duration laser, wherein the electromagnetic radiation has a pulse duration of less than or equal to 5 picoseconds, and wherein the wavelength of the electromagnetic radiation has a characteristic wavelength in the wavelength range from 150 nanometers (nm) to 2.0 microns (μm): providing cylindrical focusing optics corrected for spherical aberration: providing a diffractive optical element that when exposed to the focused ultrashort laser pulse, creates an interference pattern on the optical waveguide, wherein the irradiation step comprises irradiating a surface of the diffractive optical element with the focused electromagnetic radiation, the electromagnetic radiation incident on the optical waveguide, from the diffractive optical element, being sufficiently intense to cause the permanent change in the index of refraction in the core of the optical waveguide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.