Abstract

For convenient measurements in many applications, wavelength alterations should be translated to the change in intensity of the output light. In this Letter, a novel method based on monitoring the Moiré pattern using a simple dispersive planoconvex lens (chromatic aberration) for wavelength alteration measurement is reported. Due to the chromatic aberration of the lens, different wavelengths have different magnifications. This causes rotation in the Moiré pattern when the wavelength of the incident light is changed. It is shown that by measuring this rotation it is possible to measure the wavelength alterations. The experimental results obtained from four different laser sources with 450, 532, 630, and 632.8 nm wavelengths show total Moiré pattern rotation of about 31.5°, which shows good theory–experimental agreement. This method is simple and more reliable, and might find wide applications in spectrometry, optical sensors, and dispersion measurements.

© 2017 Optical Society of America

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