Hauser N A, Davis C C
University of Maryland, Department of Electrical Engineering, College Park, Maryland 20742, USA.
Appl Opt. 1982 Sep 15;21(18):3384-92. doi: 10.1364/AO.21.003384.
A laser propagation concept, termed bimodal atmospheric guided energy laser (BAGEL) [L. A. Newman and D. C. Smith, Appl. Phys. Lett. 38, 590 (1981)], is investigated. This propagation concept involves establishing a guiding channel using a laser beam propagating in the TEM(01) mode followed by a main beam propagating in the TEM(00) mode. The dynamics of the formation of the refractive-index profile in a gas is investigated. The focusing conditions for the near-axis portion of the channel-forming beam are obtained. It is shown that using the BAGEL concept for propagating laser energy is feasible provided that the time difference between the channel-forming and main beam is between 3 and 10 acoustic transit times, the pulse width between each pulse pair is of the order of 20 acoustic transit times, and the maximum number of pulse pairs that can be transmitted is of the order of 1000, provided that the relative intensity between the main and channel-forming beam is <0.5.
研究了一种称为双峰大气导能激光（BAGEL）的激光传播概念[L. A. 纽曼和D. C. 史密斯，《应用物理快报》38, 590 (1981)]。这种传播概念包括利用以TEM(01)模式传播的激光束建立一个导波通道，随后是一个以TEM(00)模式传播的主光束。研究了气体中折射率分布的形成动力学。得到了形成通道光束近轴部分的聚焦条件。结果表明，只要形成通道光束与主光束之间的时间差在3到10个声传播时间之间，每个脉冲对之间的脉冲宽度约为20个声传播时间，并且只要主光束与形成通道光束之间的相对强度<0.5，那么利用BAGEL概念来传播激光能量就是可行的，并且能够传输的最大脉冲对数约为1000。
