Observation of compressed picosecond pulses of high repetition rate from a Nd-glass laser

Picosecond pulses generated by a mode-locked neodymium-glass laser have been compressed down to 0.5 psec with a repetition rate up to 3 × 10 11 Hz by the insertion of a glass flat inside the laser cavity. The reduction in pulse width is attributed to a frequency-dependent transit time on transmission through the glass flat. © 1974 American Institute of Physics.