Subfemtosecond and Attosecond Pulse Generation

[[abstract]]I shall describe two effective approaches of producing multi-octave-spanning combs of frequencies that can be used to synthesize subfemtosecond and attosecond pulses. The first is by driving adiabatically a Raman coherence to its maximum that was initially proposed by Harris and Sokolov at Stanford University. The second is by cascaded harmonics generation in a monolithic crystal. I shall further demonstrate that by starting with a single laser beam the electric field waveform of the pulses synthesized from these approaches is stable and fully controllable. Since the generated pulses are in the optical region these pulses can be very useful for ultrafast study of electronic and photonic phenomena in condensed matter and semiconductors.[[fileno]]2030165030004[[department]]電機工程學