hyperspectral cl

**Hyperspectral CL** is a **cathodoluminescence mapping mode that acquires a complete emission spectrum at every pixel** — creating a 3D data cube (x, y, wavelength) that enables post-acquisition analysis of spectral features, peak fitting, and multivariate statistical analysis. **How Does Hyperspectral CL Work?** - **Acquisition**: At each pixel, record the full CL emission spectrum (e.g., 200-1000 nm). - **Data Cube**: Build a (x, y, λ) hyperspectral dataset — typically millions of spectra. - **Analysis**: Extract peak positions, widths, intensities, and shifts at each pixel. - **Methods**: PCA, NMF, k-means clustering for automated feature identification. **Why It Matters** - **Composition Gradients**: Maps alloy composition through band gap shifts (e.g., InGaN, AlGaN quantum wells). - **Stress/Strain**: Peak shifts reveal local stress through deformation potential coupling. - **Defect Classification**: Different defect types have different spectral signatures — hyperspectral CL classifies them automatically. **Hyperspectral CL** is **a full rainbow at every pixel** — collecting complete emission spectra across the sample for comprehensive optical characterization.