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OPTICAL VACUUM CELLS
 

Precision Bonding for Vacuum Cells with AR-Coated Windows

OPTOASSEMBLY provides precision bonding solutions for sealing vacuum cells with AR-coated optical windows. Our bonding processes are carefully selected and controlled to maintain the optical performance of the window while minimizing the risk of distortion, coating damage, or degradation during assembly.

We combine established bonding technologies with our specialized assembly processes to develop customized vacuum sealing solutions based on each customer's requirements. Factors such as optical specifications, AR-coating compatibility, operating temperature, vacuum performance, and material selection are considered when determining the most appropriate bonding method.

Our key bonding techniques include:

  • High- or Low-Temperature Diffusion Bonding

  • Anodic Bonding

  • Optical Contact Bonding

              

Low and high-temperature diffusion bonding is a solid-state bonding technique that uses elevated temperature, controlled pressure, and carefully prepared surfaces to create a strong, permanent bond between compatible materials.

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Low-Temperature Diffusion Bonding

Key Advantages:

  • Low-temperature processing

  • Reduced thermal stress

  • AR-coating protection

  • Minimal optical distortion

  • Adhesive-free bonding

  • High dimensional stability

  • Vacuum-compatible construction

  • Suitable for temperature-sensitive optical assemblies

High-Temperature Diffusion Bonding

Key Advantages:

  • High-strength permanent bonding

  • Excellent thermal stability

  • High dimensional stability

  • Adhesive-free bonding

  • Strong vacuum compatibility

  • Long-term bond reliability

  • Suitable for demanding thermal environments

  • Compatible with precision optical and vacuum-cell assemblies

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​Anodic bonding is a glass-to-silicon wafer bonding technique that uses a silicon wafer as an intermediate layer to join glass components and create hermetically sealed vacuum cells. OPTOASSEMBLY utilizes anodic bonding for vacuum-cell and wafer-level packaging applications where long-term sealing integrity, dimensional stability, and optical performance are critical.

Key advantages of anodic bonding for vacuum-cell applications include:

  • Direct glass-to-silicon wafer bonding

  • Hermetic sealing suitable for vacuum applications

  • No conventional organic adhesive at the bonding interface

  • High mechanical and thermal stability

  • Compatibility with wafer-level fabrication and packaging

  • Suitable for precision optical windows and vacuum-cell structures

  • Controlled processing to minimize optical distortion and coating degradation

Optical contact bonding is a precision glass-to-glass bonding technique that uses highly clean, smooth, and optically polished surfaces to create a direct bond between glass components and form hermetically sealed vacuum cells. OPTOASSEMBLY utilizes optical contact bonding for vacuum-cell and precision optical applications.

Key Advantages of Optical Contact Bonding

  • Non-thermal bonding

  • AR-coating protection

  • Minimal optical distortion

  • Adhesive-free bonding

  • Low outgassing

  • High optical quality

  • Vacuum-compatible sealing

  • Excellent dimensional stability

  • Suitable for temperature-sensitive applications

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