Optical Pulse Stretcher Cavity Control for Stable Beam Pointing
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Solution Overview
Problem
Existing optical pulse stretchers face challenges in maintaining consistent cavity length due to thermal effects and manufacturing variations, leading to changes in the radius of curvature of reflective surfaces, which affect the pointing and divergence of light pulses, resulting in poor performance and potential failure in photolithography applications.
Innovation Solution
A system comprising a pulse stretcher with a control system that adjusts the separation distance between reflective optical elements in real-time using data from sensors, compensating for changes in the radius of curvature by moving the optical elements to maintain consistent cavity length and pulse properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cavity length is fixed during manufacturing, then the device structure is simple, but thermal effects and manufacturing variations cause changes in the radius of curvature of reflective surfaces, leading to poor performance in photolithography applications
Solution Approach 1:
The patent implements active dynamic control of the cavity length by making the distance between reflective optical elements adjustable during operation. The control system modifies the cavity length in real-time based on sensor feedback, transforming a static fixed structure into a dynamic adjustable system that can compensate for thermal effects and manufacturing variations, thereby maintaining consistent pulse pointing and divergence for reliable photolithography performance
Solution Approach 2:
The patent employs a feedback control mechanism where sensors detect the actual cavity length or pulse properties, and the control system uses this information to adjust the cavity length accordingly. This closed-loop feedback system continuously monitors and corrects deviations caused by thermal effects and manufacturing tolerances, ensuring consistent optical performance without requiring extremely tight manufacturing precision
2Stability of the object's composition
If the separation distance between reflective optical elements is adjusted to compensate for thermal effects, then the pointing and divergence of light pulses is maintained, but the device requires active control systems and actuators
Solution Approach 1:
The patent uses sensor feedback to detect changes in pulse properties or cavity dimensions caused by thermal effects, and the control system automatically adjusts the separation distance between reflective optical elements to compensate. This feedback loop maintains stable pulse pointing and divergence by counteracting thermal expansion and manufacturing variations in real-time
Solution Approach 2:
The patent changes the physical parameter of the cavity length (separation distance between optical elements) in response to detected variations. By dynamically adjusting this geometric parameter based on temperature changes or pulse property measurements, the system compensates for thermal effects and maintains consistent optical performance without requiring complex additional components
Data Source
AI summary
A system includes: an optical pulse stretcher including: a first reflective optical element: a second reflective optical element; and an optical coupling system, where a distance between the first reflective optical element and the second reflective optical element defines a separation distance in an optical cavity, and the optical coupling system is configured to bring pulses of light into the cavity and to allow pulses of light to exit the cavity. The system also includes an actuation system configured to control the separation distance; a sensor configured to produce data related to at least two pulses of light that exit the cavity; and a control system coupled to the actuation system, where the control system is configured to control the actuation system and the separation distance based on the data.