Apparatus and its principle for thermal aberration compensation

Area of Science:

• Optical Engineering
• Thermal Management
• Metrology

Background:

• Laser absorption induces thermal aberrations, degrading optical system image quality.
• Existing compensators address low-order aberrations, but higher-order aberrations remain a challenge.
• Exposure tools are particularly susceptible to thermal aberrations during operation.

Purpose of the Study:

• To present a novel apparatus capable of correcting higher-order thermal aberrations.
• To introduce an active heating and cooling mechanism for precise lens temperature control.
• To develop a dynamic compensation algorithm addressing system time lags.

Main Methods:

• Development of an apparatus employing active lens heating and cooling near the pupil.
• Establishment of an analytical model to predict lens temperature profiles.
• Demonstration of the apparatus's thermal aberration compensation capabilities.
• Proposal of a dynamic compensation algorithm for real-time aberration correction.

Main Results:

• The proposed apparatus effectively generates desired temperature profiles on the lens.
• The analytical model accurately describes the lens temperature dynamics.
• The system demonstrates significant compensation for thermal aberrations.
• The dynamic algorithm successfully mitigates time lag effects.

Conclusions:

• The developed apparatus offers a viable solution for higher-order thermal aberration correction.
• Active thermal control provides a powerful method for enhancing optical system performance.
• The dynamic compensation algorithm enables real-time correction of thermally induced aberrations.