Compensation of fabry-perot surface defects. 2: silicon oxide compensating layers

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Fabry-Perot etalons are crucial optical devices.
• Surface defects limit etalon performance.
• Compensating for defects is essential for high-precision applications.

Purpose of the Study:

• To compute the properties of a Fabry-Perot etalon with surface defects compensated by a silicon oxide film.
• To determine optimal deposition strategies for compensating layers based on wavelength.
• To propose an automatic self-compensating process for etalon fabrication.

Main Methods:

• Modeling Fabry-Perot etalon properties with rectangular surface defects.
• Calculating the effects of silicon oxide film deposition on etalon performance.
• Analyzing the impact of absorption for UV and visible wavelength applications.

Main Results:

• The compensating silicon oxide layer's position (before or after the reflecting coating) depends on the wavelength (UV vs. visible).
• A significant reduction in root-mean-square (rms) deviation from 2.37 nm to 0.80 nm was demonstrated.
• An automatic self-compensating process using transmitted radiation was proposed.

Conclusions:

• Silicon oxide films effectively compensate for surface defects in Fabry-Perot etalons.
• Optimized layer deposition ensures performance across different spectral regions.
• An automated process offers a pathway to highly precise and defect-free optical components.