Amplification of phase-modulated ultrashort pulses of infrared radiation in a CO2 amplifier
An investigation was made of the influence of phase modulation of picosecond pulses on their amplification in a CO2 amplifier. Linear frequency modulation of the input pulses was not maintained during amplification. This casts doubt on the possibility of compressing such amplified pulses. However, amplification of chirped picosecond pulses in a CO2 amplifier makes it possible to generate a train of ultrashort pulses with a high ( ~ 1012 Hz) and controlled repetition frequency.