Laser spot measurement using simple devices
Source abstract
Abstract
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.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Astronomical Observations and Instrumentation · Advanced Optical Sensing Technologies · Surface Roughness and Optical Measurements
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Sección Física, Departamento de Ciencias, Pontificia Universidad Católica del Perú , Av. Universitaria 1801, Lima 32, Perú
Funding
Pontificia Universidad Católica del Perú · Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica
References (33)
Show source-provided references
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