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The conversion of light in sound plays a crucial role in spectroscopy, applied physics, and technology. In this paper, light‐sound conversion in 3D graphene sponge through a photo‐thermoacoustic mechanism is reported. It is shown that the unique combination of mechanical, optical, and thermodynamic properties of graphene assembled in a 3D sponge structure allows an unprecedented high efficiency conversion independent of light wavelength from infrared to ultraviolet. As a first application of this effect, a photothermal based graphene sponge loudspeaker is demonstrated, providing a full digital operation for frequencies from acoustic to ultrasound. The present results suggest a new pathway for light generation and control of sound and ultrasound signals potentially usable in a variety of new technological applications from high‐fidelity loudspeaker and radiation detectors to medical devices.

High‐Efficiency and Low Distortion Photoacoustic Effect in 3D Graphene Sponge