A laser diode changes color primarily by altering the semiconductor material's composition or the optical cavity conditions, which shifts the wavelength of the emitted light.Material Composition ...
The color (wavelength) of a laser diode is determined by the bandgap energy of the semiconductor material used in its construction. Different combinations of elements such as gallium, indium, aluminum, arsenic, and phosphorus create semiconductors with specific bandgaps, which correspond to different photon energies and thus different colors of light . For example, indium gallium nitride (InGaN) produces blue and green light, while aluminum gallium indium phosphide (AlGaInP) produces red and orange light . By adjusting the ratios of these elements during manufacturing, the output wavelength can be precisely tuned.
The optical cavity of the laser diode also influences the emitted wavelength. The cavity supports certain longitudinal and transverse modes, and the laser will preferentially emit light at wavelengths where the gain is highest, slightly above the bandgap energy . Changing the cavity length or temperature can shift these modes, causing small changes in the laser's color. Temperature affects the bandgap energy, so heating or cooling the diode can slightly shift the wavelength.
While the primary color is set by material composition, electrical current and temperature can fine-tune the wavelength. Increasing the current can slightly change the refractive index of the semiconductor, altering the effective cavity length and shifting the emission wavelength. This effect is used in applications like tunable diode lasers for spectroscopy or telecommunications .
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