Low loss optical waveguides inscribed in media glass substrates, associated optical devices and femtosecond laser-based systems and methods for inscribing the waveguides
AssigneePolyvalor, Limited Partnership
InventorsRaman KASHYAP, Jerome LAPOINTE, Mathieu GAGNE
Life of this patent
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Abstract
The method for inscribing a waveguide into a media glass substrate generally has the steps of: relatively moving a femtosecond laser beam along a surface of the media glass substrate while maintaining the focus of the laser beam at a depth of less than the surface, wherein the waveguide has a loss of less than 0.2 dB/cm when measured at a wavelength of light signal propagating in the waveguide during normal use of the waveguide. Particularly, the method can have varying writing parameters according to whether the waveguide is single-mode or multi-mode.
Claims33
A method for inducing a change in refractive index into a glass substrate, the method comprising:
- relatively moving a femtosecond laser beam along a surface of the glass substrate while maintaining the focus of the laser beam at a given depth from the surface and obtaining a region into the glass substrate in response to said moving, the region having a refractive index different from a refractive index of the glass substrate,
- wherein the glass substrate is a toughened glass.
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An optical device comprising:
- a glass substrate of toughened glass having a region inscribed therein at a given depth from a surface of the glass, the region having a refractive index different from a refractive index of the glass substrate.
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The optical device of claim 81, wherein the waveguide is single-mode and has a loss of less than 0.08 dB/cm, preferably less than or equal to 0.07 dB/cm, most preferably less than 0.06 dB/cm, when measured at a wavelength of light signal propagating in the waveguide during normal use of the waveguide.
The optical device of claim 81, wherein the waveguide is multi-mode and has a loss of less than 0.08 dB/cm, preferably less than or equal to 0.06 dB/cm, most preferably less than 0.03 dB/cm, when measured at a wavelength of light signal propagating in the waveguide during normal use of the waveguide.
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Dependencies are inferred from the claim text.