Micron-sized holes in quartz.

Femtosecond laser pulses have created micron-sized holes in quartz. Colors are a result of interference between light reflected from the front and back of each hole.

The tiny holes are a result of laser-induced temperatures and pressures approaching stellar conditions inside the quartz.

Laboratory of Eric Mazur and Eli Glezer, Harvard University. Micrograph by Felice Frankel, MIT.

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