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Parallel windows serve both a "protective" and a "transmission" function in optical systems. Two polished surfaces must maintain extremely high parallelism (usually expressed in arcseconds) to isolate the delicate internal optics from the complex external environment, allowing light to pass through without distortion, without altering the beam path or system imaging quality.
The two polished surfaces must maintain extremely high parallelism (usually expressed in arcseconds) to ensure that the transmitted light does not experience angular shift or ghosting.
High surface accuracy is required to minimize wavefront distortion and scattering of the transmitted beam, thus ensuring it does not affect the imaging or detection accuracy of downstream systems.
Its most basic function is to act as a "protective shield," protecting internal sensors, detectors, lenses, etc., from damage caused by external factors such as dust, moisture, and flying debris.
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