In recent decades, laser systems emitting pulses of light containing only a few electric field oscillations under their envelope have become common in many ultrafast optics laboratories. Owing to unique temporal characteristics and achieving extreme field strengths, these so-足called few足-cycle pulses have been instrumental in unlocking new regimes of light-足matter interaction.The work presented in this thesis is focused on mastering the techniques to generate and characterize few足-optical-足cycle light pulses in the near足 and short-wave infrared spectral regions. Two systems based on optical parametric chirped pulse amplification (OPCPA) are presented. Derived from the same laser front-end, they both deliver sub足-2.5-足cycle pulses at high repetition rate (200 kHz) with a stable electric field waveform. The first laser source is a near-足infrared OPCPA delivering 6 fs pulses at a carrier of 850 nm which was upgraded during this thesis. The upgrade resulted in a boost of the output pulse energy from 8 亮J to 15 亮J without loss in pulse quality. The second laser source is a few足cycle OPCPA around 2 亮m, emitting