While RCS deals with microwave frequencies, Laser Cross Section (LCS) deals with optical and near-infrared frequencies (Light Detection and Ranging, or LIDAR). LCS is governed by similar principles of reflection but focuses on the specular (mirror-like) and diffuse (scattered) properties of a surface at much shorter wavelengths.
This article serves as a masterclass on the subject. We will explore the physics of scattering, the differences between microwave (radar) and optical (laser) stealth, computational design methodologies, and ultimately, guide you toward the most authoritative PDF resources available today.
There are several types of cross sections that are relevant to RCS and LCS engineering:
A must therefore address both regimes, often teaching Multi-Spectral Stealth (MSST).
This involves the use of "loading" or resonant structures (like slots or cavities) designed to produce a scattered field that is 180 degrees out of phase with the incident field, effectively cancelling the reflection.
A single PDF on the subject will typically dedicate three chapters to: (1) RCS prediction codes (2) LCS pulse stretching (3) Hybrid methods for multi-spectral optimization.
Here is the link to download as pdf: