Ultrafast processes operating at picosecond , femtosecond , and even attosecond scale are both driven by .
Ultrafast processes operating at picosecond , femtosecond , and even attosecond scale are both studied using , optical methods that are at the front line of modern science .
Ultrafast processes operating at picosecond , femtosecond , and even attosecond scale are both driven by , and studied using , optical methods that are at the front line of modern science .