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SonyGranted patentChips & hardwareInterest 6/10

Sony patents laser design that stays stable as it heats up

Sony has secured a patent for a type of laser that emits light from its surface rather than its side. The design stacks multiple light-emitting layers with slightly different colors and uses specific electrical connections to keep the light output steady even when the temperature changes.

Why it mattersThis technology could help make laser components in electronics more reliable, as they often struggle to maintain consistent performance when they get hot during use.

In the filing’s own words

The present technology provides a surface emitting laser capable of stabilizing emission characteristics against change in driving temperature. The present technology provides a surface emitting laser including: first and second multilayer film reflectors; a plurality of active regions stacked between the first and second multilayer film reflectors; and a tunnel junction disposed between at least one set of two adjacent active regions, in which the plurality of active regions includes at least two of the active regions in which peak wavelengths of emission spectra are different from each other. According to the present technology, a surface emitting laser capable of stabilizing emission characteristics against change in driving temperature is provided.

What exactly they claim (claim 1)

1. A surface emitting laser comprising: first and second multilayer film reflectors; a plurality of active regions stacked between the first and second multilayer film reflectors; and a tunnel junction disposed between at least one set of two adjacent active regions, wherein the plurality of active regions includes at least two of the active regions in which peak wavelengths of emission spectra are different from each other, in each of at least two sets of two adjacent active regions, the tunnel junction is disposed between the two adjacent active regions, and the plurality of tunnel junctions has a higher impurity doping concentration as being farther from an emission surface of the surface emitting laser.

Facts

Company
Sony (SONY SEMICONDUCTOR SOLUTIONS CORPORATION)
Official title
Surface emitting laser, surface emitting laser array, and electronic device
Patent number
US12771096B2
Application number
18284361
Filed
Feb 4, 2022
Granted
Oct 20, 2026
Inventors
1
Claims
19

Classified under

H01S 5/18397 Electricity & electronicsH01S 5/3095 Electricity & electronicsH01S 5/34353 Electricity & electronicsH01S 5/426 Electricity & electronics
Read the full filing (official PDF) ↗ Open in the Patent Tracker

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Summaries are simplified from the filing’s own abstract and first claim. A patent filing is not a product announcement.
Patent data and drawings: U.S. Patent and Trademark Office (USPTO). Nebula is not affiliated with or endorsed by the USPTO.