Method of localized consolidation of parts assembled by molecular adhesion

Patent metadata

Field	Value
Publication number	US-12258290-B2
Application number	US-202217994164-A
Country	US
Kind code	B2
Filing date	Nov 25, 2022
Priority date	Nov 25, 2021
Publication date	Mar 25, 2025
Grant date	Mar 25, 2025

Abstract

A method of assembling together a first part and at least one second part that are made of materials compatible with bonding by molecular adhesion includes a step of pressing a first surface of the first part against a second surface of the second part so as to create molecular bonds at an interface between the parts, and a step of consolidating the interface bonding as created in this way by heat treatment. The consolidation includes a step of emitting a power laser beam towards an impact point forming a portion of the outline of the interface, and a step of moving the impact point along the outline of the interface.

First claim

The invention claimed is:

1. A method of assembling of a gyrolaser having a main body including a cavity, the method comprising:
pressing a first surface of a mirror against a second surface bordering an opening of the main body so as to create molecular bonds at an interface between the mirror and the main body to fix them one to the other by molecular adhesion, the main body and the mirror being made of materials that are compatible with bonding by molecular adhesion, and
heating the interface to consolidate the molecular bonds created at the interface, consolidation comprising emitting a power laser beam towards an impact point forming a portion of an outline of the interface, and moving the impact point along the whole outline of the interface, consolidation being performed after at least one electrode has been cold bonded onto the main body.

2. The method according to claim 1 , wherein the laser beam has a wavelength of 1064 nm and is operated so that it delivers pulses, each having a duration of 20 ns and energy of 260 mJ.

3. The method according to claim 1 , wherein the main body and the mirror are made of glass-ceramic, of glass, of sapphire, or of quartz.

4. The method according to claim 1 , wherein the impact point is moved in such a manner as to perform a plurality of passes along the outline.

5. The method according to claim 1 , wherein consolidation is performed after the cavity has been filled with a gas mixture.

6. The method according to claim 1 , wherein consolidation is performed by means of a laser emitter adjustable in position and orientation in relation to a stand on which is mounted a turntable supporting the main body.

7. A method of assembling of a gyrolaser having a main body including a cavity, the method comprising:
pressing a first surface of a mirror against a second surface bordering an opening of the main body so as to create molecular bonds at an interface between the mirror and the main body to fix them one to the other by molecular adhesion, the main body and the mirror being made of materials that are compatible with bonding by molecular adhesion, and
after at least one electrode has been cold bonded onto the main body, heating the interface to consolidate the molecular bonds created at the interface, consolidation comprising emitting a power laser beam towards an impact point forming a portion of an outline of the interface, and moving the impact point along the whole outline of the interface, said power laser beam being produced by a laser emitter operated so that it delivers pulses having energy and repetition rate determined in such a manner that impacts of the pulses serve to create covalent bonds at the interface between the parts, but without causing the materials of the main body and the mirror to melt.

Assignees

• Safran Electronics & Defense

Inventors

• Picard Mathieu
• Letourneur Bruno
• Henault Bastien
• Garnier Alice

Classifications

• H01S3/083

  Ring lasers {(fibre ring lasers H01S3/06791)} · CPC title

• H01S3/0816

  having 4 reflectors, e.g. Z-shaped resonators · CPC title

• H01S3/0602

  Crystal lasers or glass lasers (H01S3/063 takes precedence) · CPC title

• G01C19/661

  details · CPC title

• C03B23/20

  Uniting glass pieces by fusing without substantial reshaping · CPC title