Abstract:A fundamental way to improve the ability of lidar to detect the small target far away is to increase the light intensity on it, and the coherent combination of laser beams is an effective way to obtain a large intensity on the target. A parameter named combining effect factor is introduced to evaluate the combining effect on small target. On this basis, the factors influencing combining effect are discussed. The combining effect factor becomes oscillatory as the spacing between the waists of laser beams increa… Show more
“…[22] Some researchers have investigated the scattered characteristics of Gaussian beams from dielectric and conducting targets. [23][24][25][26] In recent years, the rapid development of laser detection technologies has created a great demand for theoretical models. As a result, the pulse beam, as the closest theoretical model of the laser, has been brought forward in order to obtain more precise models in Lidar engi-neering applications.…”
Doppler shift of a laser pulse beam scattered by a rotating cone and cylinder * Wang Bao-Ping(王保平) a) , Wang Ming-Jun(王明军) b) † , Wu Zhen-Sen(吴振森) c) , Li Ying-Le(李应乐) b) , and Xiang Ning-Jing(向宁静) b)c) a)
“…[22] Some researchers have investigated the scattered characteristics of Gaussian beams from dielectric and conducting targets. [23][24][25][26] In recent years, the rapid development of laser detection technologies has created a great demand for theoretical models. As a result, the pulse beam, as the closest theoretical model of the laser, has been brought forward in order to obtain more precise models in Lidar engi-neering applications.…”
Doppler shift of a laser pulse beam scattered by a rotating cone and cylinder * Wang Bao-Ping(王保平) a) , Wang Ming-Jun(王明军) b) † , Wu Zhen-Sen(吴振森) c) , Li Ying-Le(李应乐) b) , and Xiang Ning-Jing(向宁静) b)c) a)
Beam combination (BC) of fiber amplifiers based on master-oscillator-power-amplifier configuration is an outstanding way to generate high power and high beam quality laser output, where the tip/tilt aberrations among beamlets are considered as a serious influence factor to BC effects. In this paper, a new tip/tilt control method based on adaptive power-in-the-bucket (PIB) cost function is proposed to solve the problem of restricted tip/tilt correcting value in current BC systems. Experimental setup of coherent BC of two-channel 2 W fiber amplifier array is established. Home-made piezoelectric-ring fiber-optic phase-modulator and adaptive fiber-optics collimator are employed to correct piston-and tip/tilt-type aberrations, respectively. The feasibility of proposed tip/tilt control method using adaptive-PIB is demonstrated and nice effect of coherent BC is achieved.
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