Rapid convergence of mid-spatial-frequency errors based on a vibration-assisted polishing strategy

Area of Science:

• Materials Science
• Optical Engineering
• Manufacturing Processes

Background:

• High-hardness materials such as silicon carbide are crucial for advanced optics like space telescope mirrors and laser systems due to their superior mechanical and thermal properties.
• Conventional polishing methods struggle with high-hardness materials, leading to low material removal rates and difficulties in controlling mid-spatial-frequency (MSF) errors, limiting process optimization and convergence.

Purpose of the Study:

• To develop and validate a novel vibration-assisted polishing tool for overcoming the limitations in polishing high-hardness materials.
• To enhance the material removal rate and improve the convergence efficiency of mid-spatial-frequency (MSF) errors in precision optical components.

Main Methods:

• Development of an industrially robot-integrated, unidirectional vibration-assisted polishing tool with adjustable vibration direction.
• Application of micro-scale vibrations at the tool-workpiece interface to influence abrasive particle behavior and material removal dynamics.
• Experimental validation of the vibration-assisted polishing strategy on high-hardness materials.

Main Results:

• The vibration-assisted polishing tool demonstrated an expanded abrasive particle coverage area and improved distribution uniformity.
• The strategy effectively broke the anisotropy of the removal function and reduced periodic errors, enhancing abrasive grain activation.
• Significant improvements in the convergence efficiency of mid-spatial-frequency (MSF) errors and overall process robustness were achieved.

Conclusions:

• The novel vibration-assisted polishing strategy offers a significant advancement for efficiently polishing high-hardness materials.
• This method effectively addresses the challenges associated with MSF error convergence, paving the way for improved manufacturing of precision optical systems.
• The developed tool and technique enhance process robustness and efficiency, offering a viable solution for demanding optical applications.