In this paper a simple and easy to implement method that uses the Airy disk generated from a
Fraunhofer diffraction pattern due to a circular aperture will be used to estimate the wavelength of
the illuminating laser source. This estimation is based on the measurement of the Airy disk
diameter, whose approximation is directly proportional to the wavelength of the light source and to
the distance between the aperture and the image plane; and inversely proportional to the diameter of
the aperture. Due to the characteristics and versatility of the present proposal, this is perfectly
suitable for use in graduate or undergraduate physics laboratories, or even in classrooms for
educational and/or demonstrative purposes.