Use a diffraction grating to measure two wavelengths
Laser Tuning With Diffraction Gratings
Determination of Laser Wavelength by Diffraction Grating - YouTube
Laser & Diffraction Grating | PhysicsOpenLab
Optical characterization of the diffraction grating fabricated via... | Download Scientific Diagram
High-Performance All-Organic DFB and DBR Waveguide Laser with Various Grating Height Fabricated by a Two-Photon Absorption DLW Method | Scientific Reports