Miniaturization is the development direction of space payload. In this paper, an integrated laser communication and lidar system is proposed. The laser communication and lidar share a hardware system, and the laser is modulated by BPSK, Chirp amplitude-modulated laser is used, and optical coherence zero-difference detection method is adopted to obtain the target range and velocity information, the composition and working principle of the system are introduced briefly, the laser communication link is analyzed, and the target detection performance under different conditions is studied. Theoretical analysis and simulation results show that the integrated scheme is feasible and effective, the communication rate can reach 2Gbps@(60000km,1E-7), and the effective detection range of space debris can reach more than 50km.
Nonlinear optical properties in La-modified ( 1-x ) Pb ( Mg1/3Nb2/3 ) O3-xPbTiO3 (PMN-PT) (3/75/25) transparent ceramic are studied. The optical nonlinearity is investigated employing Z-scan technique at the off-resonant wavelengths of 515 and 1030 nm. The two-photon absorption coefficient is measured up to be 9.6 cm / GW at 515 nm, and three-photon absorption coefficient is found to be 0.091 cm3 / GW2 at 1030 nm. When an external electric field was applied to the PMN-PT, we found that the electric field increased from 0 to 3 kV / cm in the closed-aperture Z-scan experiment with the wavelength of 515 nm, whereas the nonlinear refractive index n2 increased from 1.85 × 10 − 8 esu to 3.87 × 10 − 8 esu, an increase of 110%. The large nonlinear effect could be applied in areas such as sensor protection and telecommunications and to write permanent refractive index structures into the interior of optical materials, which may make a difference in integrate optoelectronic devices progress.
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