2.05-µm all-fiber laser source designed for CO₂ and wind coherent lidar measurement

This work reports on an all-fiber pulsed laser source for simultaneous remote sensing of C mathvariant="normal">O 2 concentration and wind velocity in the 2.05 µm region. The is based a polarization-maintaining master oscillator power amplifier (MOPA) architecture. Two narrow-linewidth oscillators ON-line/OFF-line differential absorption lidar operation alternately seed four-stage chain at fast switching rate up to 20 kHz. MOPA architecture delivers pulses 120 µJ energy, 200 ns duration (600 W peak power) kHz pulse repetition (2.4 average power). output linewidth lower than 5 MHz, close Fourier transform limit, beam quality factor M = 1.12 . also provides pre-amplified mW local with relative intensity noise − 160 mathvariant="normal">d mathvariant="normal">B / mathvariant="normal">H mathvariant="normal">z that ensures optimal performance future coherent detection.