If the bodyguard is suddenly removed -- if the coupling laser is turned off as the probe light is passing through the gas cloud -- then the probe beam stops dead in its tracks, unable to move further.

Scientists make transparent materials absorb light. Moscow Institute of Physics and Technology. Journal Optica Funder Ministry of Education and Science of the Russian Federation (Minobrnauka) (3. ...

The concept involves shining a beam, such as a laser, onto a material from above to pump it full of energy. This can alter the material's properties, making it transparent to other wavelengths of ...