Geometric arrangement of laser beams in target area

Jichun Tan; XiaoFeng Wei; Qin Zhong; Zhe Chen; Xiao Min Zhang; Lirong Liu; Ziquan Shi

doi:10.1117/12.354206

23 July 1999 Geometric arrangement of laser beams in target area

Jichun Tan, XiaoFeng Wei, Qin Zhong, Zhe Chen, Xiao Min Zhang, Lirong Liu, Ziquan Shi

Proceedings Volume 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion; (1999) https://doi.org/10.1117/12.354206
Event: Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, 1998, Monterey, CA, United States

Abstract

A ray tracing method for design of geometrical arrangement of laser beams in target area is described in this paper. A mathematically mode for path's design are suggested to minimize the objective functions f_j(R_i, L_i, (alpha) _i, (beta) _i), which are the optical length difference between the real path length from laser amplifier to the target center and the design objective path length. And the constraint conditions for beam's path are as follows: (1) Beams illuminate the cylindrical target with the incident angles required for the physical experiments. (2) 60 beams propagate without overlapping each other, and each of them with equal optical length from the laser amplifier to the target center. (3) Bema incident to the reflection mirror P_i with the decided angle (phi) _i, for example, value of (phi) _i is less than or equal to 45 degrees for all paths, and etc. Mathematical methods, such as 'Depth First Search technique', or searching optimum point for objective function f_j(R_i, L_i, (alpha) _i, (beta) _i) with constraint conditions are stated. Design examples are reported, in which the 60-Gaussian beam are symmetrically distributed around the target chamber.

Citation Download Citation

Jichun Tan, XiaoFeng Wei, Qin Zhong, Zhe Chen, Xiao Min Zhang, Lirong Liu, and Ziquan Shi "Geometric arrangement of laser beams in target area", Proc. SPIE 3492, Third International Conference on Solid State Lasers for Application to Inertial Confinement Fusion, (23 July 1999); https://doi.org/10.1117/12.354206

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