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US 11,152,764 B1Granted
Gratings for high power single mode laser
AssigneeFreedom Photonics LLC
InventorsGordon Barbour Morrison, Bob Benjamin Buckley
Life of this patent
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Abstract
An optical device is provided that includes a waveguide layer and at least one grating structure. A coupling coefficient of the at least one grating structure to a fundamental optical mode supported by the waveguide layer is greater than a coupling coefficient of the at least one grating structure to at least one higher order transverse optical mode supported by the waveguide layer.
Claims30
A laser comprising:
- a substrate comprising:
- an active layer comprising a waveguide, the active layer configured to support a fundamental optical mode and at least one higher order transverse optical mode;
- at least one primary grating structure;
- a ridge over the active layer comprising the waveguide, the ridge having a width Wr, the ridge comprising a material having a first refractive index lower than a second refractive index of the waveguide;
- at least one secondary grating structure disposed in an edge portion of the ridge spaced apart from the at least one primary grating structure,
- wherein reflection of light from the at least one secondary grating structure is configured to be out of phase with reflection of light from the at least one primary grating structure, and
- wherein a coupling coefficient of the at least one primary grating structure to the fundamental optical mode is greater than a coupling coefficient of the at least one primary grating structure to the at least one higher order transverse optical mode.
4 more elements
An optical device comprising:
- a waveguide layer configured to support a fundamental optical mode and at least one higher order transverse optical mode;
- and
- at least one grating structure comprising a plurality of parallel grating structures configured to preferentially select a single transverse optical mode,
- wherein a coupling coefficient of at least one of the plurality of parallel grating structures to the fundamental optical mode is greater than a coupling coefficient of the at least one of the plurality of parallel grating structures to the at least one higher order transverse optical mode, and
- wherein different grating structures from the plurality of parallel grating structures have a phase difference.
2 more elements
Dependencies are inferred from the claim text.