![Micron-sized holes in quartz.](images/image8big.jpg)
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.