A method for laser welding of quartz glass for atomic cells and an atomic cell

By combining pre-welding and main welding in a two-stage welding process, the problems of airtightness and heat-affected zone in quartz glass atomic gas chambers were solved, achieving a welding effect with high airtightness and low heat-affected zone, thus ensuring the stability and consistency of the atomic gas chambers.

CN122145016BActive Publication Date: 2026-07-21SHANGHAI INST OF OPTICS & FINE MECHANICS CHINESE ACAD OF SCI
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Patent Information

Application Number
CN202610627886.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-05-09
Publication Date
2026-07-21
Estimated Expiration
2046-05-09

AI Technical Summary

Technical Problem

Existing laser welding methods struggle to achieve both ultra-high airtightness and minimal heat-affected zone simultaneously within a quartz glass atomic gas chamber, and fail to provide specific process parameters and quantitative indicators.

Method used

A two-stage welding process combining pre-welding and main welding is adopted. By using discrete welding point temporary fixing components and combining the relationship between limiting the spacing of pre-welding welding points and the diameter of the main welding spot, the airtightness and uniformity of the weld are ensured. CO2 laser beam is used for welding to control the weld penetration and heat-affected zone.

Benefits of technology

It achieves an airtightness better than 8×10-11 Pa·m³/s, a weld heat-affected zone of less than 1.5 mm, and provides verifiable quantitative evidence for welding quality, reducing the uncertainty of technology implementation and improving the long-term stability and consistency of atomic gas chambers.

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Abstract

The application discloses a quartz glass laser welding method and an atomic cell, and belongs to the technical field of atomic cell packaging. The method is characterized in that first and second quartz glass components are butted to form a joint interface, and CO2 laser beams are used for welding, which is divided into two steps of pre-welding and main welding. In the pre-welding, a first laser power is used for scanning to form a plurality of discrete fusion points to fix the components; in the main welding, a second laser power larger than the first laser power is used for continuous scanning to form a sealing weld. The interval between adjacent fusion points formed by the pre-welding is less than 1.5 times the diameter of a main welding spot, so that the main welding weld can completely cover and fuse the discrete points, and the weld is continuous and uniform. By controlling the laser power and the scanning speed, the weld penetration is stabilized at 0.5 mm-2 mm, the air tightness is better than 8*10 ‑11 Pa·m³ / s, and the heat affected zone width is less than 1.5 mm. The application further discloses an atomic cell prepared by using the method, which can avoid component displacement and stress concentration, realize sealing welding with high air tightness and low heat affected zone, and improve the long-term stability of the atomic cell.
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