Dispersion gating-based atmospheric composition measurement laser radar

A lidar for detecting atmospheric composition based on time-stretch and tailoring, comprising a femtosecond laser, a time-stretch and tailoring apparatus, a laser pulse amplifying apparatus, a laser transceiving apparatus, an atmosphere background noise filtering module, a detection apparatus, a signal acquisition apparatus, and a data processing apparatus, wherein,

• the femtosecond laser is configured to output a femtosecond laser pulse;
• the time-stretch and tailoring apparatus is configured to perform time-stretch on the femtosecond laser pulse and tailor a spectrum of the femtosecond laser pulse in time domain, to output a first target laser pulse with a predetermined wavelength;
• the laser pulse amplifying apparatus is configured to generate a second target laser pulse by amplifying power of the first target laser pulse;
• the laser transceiving apparatus is configured to transmit the second target laser pulse into the atmosphere after compressing a divergence angle of the second target laser pulse, and receive an echo signal from the atmosphere;
• the atmosphere background noise filtering module is configured to process noises in the echo signal from the atmosphere;
• the detection apparatus is configured to detect the echo signal from the atmosphere and output a corresponding electrical signal;
• the signal acquisition apparatus is configured to acquire the electrical signal;
• and
• the data processing apparatus is configured to process the electrical signal to obtain concentration information of gaseous constituents of the atmosphere.