Researchers develop first room temperature holmium-doped yttrium lithium fluoride thin disk laser
In a study published in Optics Express, a research group led by Prof. Fu Yuxi from Xi'an Institute of Optics and Precision ...
I put these ultra-durable solar spotlights through wind, rain, and even frost — here's what happened
If you turn the spotlight over, you'll notice an on/off switch on the reverse. However, if you are operating the switch in the daylight you won't be able to tell whether it is on or off. Simply place ...