A single-mode single frequency eye-safe pulsed all fiber laser based on master oscillator power amplification structure is presented. This laser is composed of a narrow linewidth distributed laser diode seed laser and two-stage cascade amplifiers. 0.8 m longitudinally gradient strained erbium/ytterbium co-doped polarization-maintaining fiber with a core diameter of 10 μm is used as the gain fiber and two acoustic-optics modulators are adopted to enhance pulse extinction ratio. A peak power of 160 W and a pulse width of 200 ns at 10 kHz repetition rate are achieved with transform-limited linewidth and diffraction-limited beam quality. This laser will be employed in a compact short range coherent Doppler wind lidar.
Scanning lidar imaging system using a linear detector array is constituted by both sides into 45° angle of mutual mirror
composition. The construction of equivalent optical systems is greatly simplified in the imaging derivation process with
intuitive method and analytic geometry. The optical imaging formulas are accurately derived for all the spots of the
image. Based on the imaging requirements of the Lunar and Mars exploration technology, numerical simulations and
error analysis were performed in the paper. It is shown that the maximum distortion ratio of the central spots
pillow-shape distortion image is 3.41% in horizontal direction and the excursion of the edge spots by laser pulse at
certain divergence angle is 0.194m, 0.096m in horizontal direction and vertical direction, respectively. The work of this
paper can provide the theory basis of the lidar imaging signal processing on-line or off-line used in the deep space
exploration projects.
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