Laser spot measurement using simple devices

M. Bonnett Del Alamo, C. Soncco, R. Helaconde, J. L. Bazo Alba, A. M. Gago

Producción científica: Contribución a una revistaArtículorevisión exhaustiva

7 Citas (Scopus)


We have designed and tested an automated simple setup for measuring the profile and spot size of a Gaussian laser beam, which exhibits a similar performance to ready-made optical devices, using three light sensors. We use a light dependent resistor as a novel instrument in this approach with good accuracy. We provide the setup in detail in order to be reproduced with the current technology at a standard laboratory. Two profiling techniques were implemented: the imaging technique for the CMOS 2D array (webcam) and scanning knife-edge-like technique using a single photodiode and a light dependent resistor. We apply up-to-date devices, such as a Raspberry Pi, for automation. The methods and sensors were compared to determine their accuracy using lasers of two different wavelengths and technologies. We verify that it is possible to use a webcam to determine the profile of a laser with 1% uncertainty on the beam waist, 1.5% error on the waistline position, and less than 3% error in determining the minimum spot radius. We show that it is possible to use a light dependent resistor to estimate the laser spot size with an 11% error. The photodiode measurement is the most stable since it is not affected by the change in laser intensity.

Idioma originalInglés
Número de artículo075016
PublicaciónAIP Advances
EstadoPublicada - 1 jul. 2021
Publicado de forma externa


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