Example image of eyePlorer eyePlorer map for 'Laser diode': Laser Light-emitting diode Semiconductor Electric current P–n junction Doping (semiconductor) Diode N-type semiconductor P-type semiconductor Charge carrier Electron Electron hole Depletion region Solid-state laser Lasing threshold Phonon Direct and indirect band gaps Gallium antimonide Gallium nitride Gallium(III) arsenide Indium phosphide Stimulated emission Phase (waves) Polarization Silicon Optical cavity Fabry–Pérot interferometer Laser pumping Diffraction Lens (optics) Laser pointer Band gap Aluminium gallium arsenide Heterojunction Active laser medium Quantum well Wave function Density of states Quantum well laser Normal mode Waveguide Quantum dot Quantum wire Quantum cascade laser Wavelength Refractive index Distributed feedback laser Wavelength-division multiplexing Anti-reflective coating Vertical-cavity surface-emitting laser