Abstract
Historically, lasers have been used for a variety of purposes such as spectroscopy or optics. Lasers have even been used as a surveillance device; however, minimal research has been done in this area. In this experiment, a laser microphone was designed and tested with several different colored lasers to determine the frequency response of the received signal due to wavelength differences from the emitted light. The laser microphone included two telescoping lenses and an interferometer setup with a flimsy mirror as one of the arms. This mirror created a vibrating diffraction pattern when sound waves were played in close proximity. The interferometer was set up in an anechoic chamber, and a transimpedance photodiode was used to collect data of a moving diffraction pattern. With this setup, different sounds were recorded with varying levels of clarity, and the spectral response of the laser microphone was analyzed. With further research, a choice of laser color could be chosen to optimize the signal’s response.
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