Bi-Pulse Fiber Laser Source Concept for Integrated-Path Differential Absorption Lidar from Space

CO 2 monitoring over an atmospheric column provides crucial information for climate change monitoring. A possible implementation for this measurement is IPDA (Integrated-Path-Differential-Absorption) lidar on a satellite that measures the absorption difference between two close wavelengths $(\lambda_{\mathrm{O}\mathrm{N}}$ , absorbed by CO 2 and $\lambda_{\text{OFF}}$ , not absorbed). Distance to ground must be simultaneously measured. Pulses must be short enough for telemetry (<100ns), narrow-linewidth for spectrally resolved absorption measurement (<100MHz) and high-energy for signal-to-noise ratio (mJ-level).