High Accuracy Laser Power Measurement for Laser Pointers Safety Assessment
Laser pointers are common tools for teachers, students, and researchers as pointer devices in classrooms or meeting rooms. Some people use laser pointers for toys, hobbies and entertainments. For safety concern, these laser pointers are designed to emit laser power level below 5 mW as restricted by many countries regulations. However, advances in laser technology, allowed the production of low low-cost laser pointer devices, at a wide range of visible wavelengths, delivering considerable light output power, which are available for the general public. In fact it is now common, to have laser pointers and laser gadgets of all colors and power range, from few mW to several watts available to buy. As a result, laser pointers are in the hands of uninformed people about the potential injuries that can arise from the handling of these devices. This is resulting in a worldwide increase of retinal injuries reporting. In this research, the laser power levels of randomly purchased laser pointers in Thailand markets will be assessed in order to check the accuracy of their laser safety labels, using a dedicated laser pointer power testing kit developed at National Institute of Metrology (Thailand). A set of twenty laser pointers, red, green and violet, randomly acquired in market have been assessed with respect to their power output level and emitted wavelengths lines. The limits imposed by The US Code of Federal regulations for lasers devices will be used as a reference.
This work is supported by the new researcher scholarship of CSTS, MOST project, which is sponsored by the Coordinating Center for Thai Government Science and Technology Scholarship Students (CSTS), National Science and Technology Development Agency (NSTDA).
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