Micro-pulse differential absorption laser radar transmitter for detecting atmospheric water vapor

The invention discloses a micro-pulse differential absorption laser radar transmitter for detecting atmospheric water vapor. A DFB semiconductor continuous wave laser reference unit forms a stable wavelength reference of a continuous wave laser; a DFB semiconductor continuous wave laser on unit and a DFB semiconductor continuous wave laser off unit are chopped into a pulse laser with a repetitionfrequency of 10kHz magnitude and a pulse width which is less than 1 microsecond by an acoustic optical modulator through a 2*1 gating switch, and the pulse laser with small energy passes through a Raman optical fiber amplifier to improve single pulse energy; the pulse laser with energy which is improved by a Raman optical fiber amplifier is converted into 825.5 +/-0.25 nm pulse laser by a frequency doubler, and the final pulse laser energy reaches 10 microJ magnitude; and a pumping source of the Raman optical fiber amplifier is a high-power semiconductor laser near 1540nm. The transmitter hasthe advantages that the sy