Edge-emitting laser bar

Patent metadata

Field	Value
Publication number	US-11411375-B2
Application number	US-201816637698-A
Country	US
Kind code	B2
Filing date	Aug 21, 2018
Priority date	Aug 28, 2017
Publication date	Aug 9, 2022
Grant date	Aug 9, 2022

Abstract

An edge emitting laser bar is disclosed. In an embodiment an edge-emitting laser bar includes an AlInGaN-based semiconductor layer sequence having a contact side and an active layer configured to generate laser radiation, a plurality of individual emitters arranged next to each other and spaced apart from one another in a lateral transverse direction, each emitter configured to emit laser radiation and a plurality of contact elements arranged next to each other and spaced apart from one another in the lateral transverse direction on the contact side for making electrical contact with the individual emitters, each contact element being assigned to an individual emitter, wherein each contact element is electrically conductively coupled to the semiconductor layer sequence via a contiguous contact region of the contact side so that a current flow between the semiconductor layer sequence and the contact element is possible via the contact region.

First claim

The invention claimed is:

1. An edge-emitting laser bar comprising:
an AlInGaN-based semiconductor layer sequence having a contact side and an active layer configured to generate laser radiation;
a plurality of individual emitters arranged next to each other and spaced apart from one another in a lateral transverse direction, each emitter configured to emit laser radiation; and
a plurality of contact elements arranged next to each other and spaced apart from one another in the lateral transverse direction on the contact side for making electrical contact with the individual emitters, each contact element being assigned to an individual emitter,
wherein each contact element is electrically conductively coupled to the semiconductor layer sequence via a contiguous contact region of the contact side so that a current flow between the semiconductor layer sequence and the contact element is possible via the contact region,
wherein the laser bar has a thermal decoupling structure in a region between two adjacent individual emitters, the thermal decoupling structure being configured to counteract a heat exchange between the two adjacent individual emitters,
wherein the decoupling structure comprises an electrically conductive cooling element located on the contact side and completely covering a contiguous cooling region of the contact side,
wherein the cooling element is electrically isolated from the semiconductor layer sequence along the cooling region and thermally coupled to the semiconductor layer sequence along the cooling region,
wherein the cooling region has a width, measured along the lateral transverse direction, which is at least half a width of an adjacent contact region,
wherein the cooling element comprises a contact element of an individual emitter adjacent to the decoupling structure,
wherein the decoupling structure, having a cooling element, is provided on both sides of an individual emitter, and
wherein the cooling elements of the two decoupling structures arranged on both sides comprise the contact element of the individual emitter.

2. The laser bar according to claim 1 , wherein the contact elements are separated from one another and are not connected to each other.

3. The laser bar according to claim 1 , wherein the cooling element in the cooling region is spaced from the contact side of the semiconductor layer sequence by a separating layer, and wherein the separating layer has a thermal conductivity of at least 50 W/(m·K).

4. The laser bar according to claim 3 , wherein the separating layer comprises one of the following materials: SiC, DLC or AlN.

5. The laser bar according to claim 1 , wherein the cooling element is a separate element from the contact elements and spaced apart from the contact elements in the lateral transverse direction, and wherein the cooling element is completely electrically isolated from the semiconductor layer sequence.

6. The laser bar according to claim 5 , wherein the cooling element has the same material composition as the contact elements, and wherein the cooling element has the same lateral dimensions as the individual contact elements within a manufacturing tolerance.

7. The laser bar according to claim 5 ,
wherein all contact elements are arranged equidistantly to each other,
wherein one or more cooling elements are arranged in a region between each two individual emitters and are in each case elements which are different from the contact elements, and
wherein distances of each contact element from two closest cooling elements arranged on both sides of the contact element are the same.

8. The laser bar according to claim 5 ,
wherein all contact elements are arranged equidistantly to each other,
wherein one or more cooling elements are arranged in a region between each two individual emitters and are in each case elements which are different from the contact elements, and
wherein distances between each contact element and two closest cooling elements arranged on both sides of the contact element are different.

9. The laser bar according to claim 1 , wherein the semiconductor layer sequence comprises a plurality of parallel ribs spaced apart in the lateral transverse direction at the contact side, wherein each individual emitter comprises a rib, and wherein the contact region is formed in a region of the rib, respectively, so that charge carriers are injected from an associated contact element into the active layer via an associated rib in order to operate the individual emitter.

10. The laser bar according to claim 1 , wherein the decoupling structure comprises a rib, and wherein the cooling region of the decoupling structure extends over at least 80% of the rib associated with the decoupling structure.

11. The laser bar according to claim 1 , wherein the decoupling structure comprises two electrically conductive cooling elements which are spaced apart from one another in the lateral transverse direction and which are not connected.

12. The laser bar according to claim 1 , wherein the individual emitters are gain-guided laser diodes.

13. An Optoelectronic component comprising:
the laser bar according to claim 1 ; and
a heat sink,
wherein the contact elements and the cooling elements are each connected to the heat sink via a solder material or an adhesive.

14. An edge-emitting laser bar comprising:
an AlInGaN-based semiconductor layer sequence having a contact side and an active layer for generating laser radiation;
a plurality of individual emitters arranged next to each other and spaced apart from one another in a lateral transverse direction and each emitter configured to emit laser radiation; and
a plurality of contact elements arranged next to each other and spaced apart from one another in the lateral transverse direction on the contact side for making electrical contact with the individual emitters, each contact element being assigned to an individual emitter,
wherein each contact element is electrically conductively coupled to the semiconductor layer sequence via a contiguous contact region of the contact side so that a current flow between the semiconductor layer sequence and the contact element is possible via the contact region,
wherein the laser bar has a thermal decoupling structure in a region between two adjacent individual emitters, the thermal decoupling structure configured to counteract a heat exchange between the two adjacent individual emitters,
wherein the decoupling structure comprises a trench extending at least partially through the laser bar in a vertical direction perpendicular to the active layer,
wherein the semiconductor layer sequence is grown on a growth substrate, and
wherein the trench extends from a side of the growth substrate opposite the contact side into the growth substrate.

15. The laser bar according to claim 14 , wherein the trench extends at least partially through the semiconductor layer sequence.

16. The laser bar according to claim 14 , wherein the contact elements are separated from one another and are not connected to each other.

17. An edge-emitting laser bar comprising:
an AlInGaN-based semiconductor layer sequence having a contact side and an active layer for generating laser radiation;
a plurality of individual emitters arranged next to each other and spaced apart from one another in a lateral transverse direction, each emitter configured to emit laser radiation; and
a plurality of contact elements arranged next to each other and spaced apart from one another in the lateral transverse direction on the contact side for making electrical contac

Assignees

• Osram Oled Gmbh

Inventors

• Lell Alfred
• Ali Muhammad
• Stojetz Bernhard
• Koenig Harald

Classifications

• H01S5/04254

  characterised by the shape · CPC title

• H01S5/02469

  Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC · CPC title

• H01S5/32341

  blue laser based on GaN or GaP · CPC title

• H01S5/22

  having a ridge or stripe structure · CPC title

• H01S5/0421

  characterised by the semiconducting contacting layers (electrodes H01S5/0425) · CPC title