Laser spot measurement using simple devices
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.
- Publication:
-
AIP Advances
- Pub Date:
- July 2021
- DOI:
- 10.1063/5.0046287
- arXiv:
- arXiv:2004.13682
- Bibcode:
- 2021AIPA...11g5016B
- Keywords:
-
- Physics - Instrumentation and Detectors;
- Physics - Optics
- E-Print:
- 18 pages, 9 figures