■ Introduction
This website is an independently operated technical resource based on my professional experience in optical design. It provides a systematic explanation of fundamental theories in geometrical optics and wave optics, organized through careful mathematical derivations relevant to optical design and optical measurement.

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■ Purpose of the Site
The aim of this site is to offer clear and thorough explanations of key concepts in geometrical and wave optics, which form the foundation of optical design. By supplementing assumptions and derivation steps that are often omitted in textbooks, this independent optical design reference site is intended to serve as a place where readers can study essential optical theory in depth. I hope it will support students as well as researchers and engineers engaged in development work in deepening their understanding of optics.

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■ Academic Background
I majored in electronic engineering at both undergraduate and graduate levels, conducting research on semiconductor materials. During that time, I gained broad experience with optical experiments such as weak-light detection, polarization measurements, and time‑resolved spectroscopy.

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■ Professional Experience
After completing my master’s degree, I joined a major optical instrument manufacturer, where I began working in optical design. For more than 25 years, I have been responsible for designing optical systems used in microscopes, spectrometers, and other instruments for research, industrial, and medical applications. The design software I have used includes CODE‑V, OpTaliX, and ZEMAX.

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■ Expertise Reflected in This Site
My expertise lies in explaining optical theory through careful mathematical derivations, without omitting assumptions, so that readers can follow the logical flow of the concepts. Based on an approach that integrates both geometrical and wave optics, I strive to systematically organize fundamental theories that are useful in practical optical design and optical measurement.

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■ Qualifications and Interests

• Optical Certification (International Optical Technology Certification Association), Silver Level (2015)

• Mathematics Certification, Grade Pre‑1 (2008)

I enjoy mathematical approaches and often use equations in my explanations. I hope to convey the fascination of both optics and mathematics.

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■ Policy of Operation
This site focuses on fundamental optical theory rather than practical design know‑how. It is operated with careful attention to ensure that proprietary knowledge and techniques gained through my employment are not disclosed.

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■ Closing Remarks
This website is operated as an independent, specialized optical design reference site. Although its scale is modest, I plan to continue expanding its content step by step and to further develop the systematic organization of fundamental theories useful in optical design practice. In the future, I hope to compile these foundational theories into a comprehensive optical design reference book. Your occasional visits would be greatly appreciated and provide strong encouragement.