Simpson J D, Bosch R A, Failor B H, Gabl E F
Appl Opt. 1990 Oct 20;29(30):4447-52. doi: 10.1364/AO.29.004447.
We have measured 527-nm absorption for induced spatial incoherence (ISI) and non-ISI illumination of high-Z targets over the 0.5-3.5 x 10(14)-W/cm(2) laser intensity range using energy balance with a custom designed 30-cm diam light integrating sphere. Induced spatial incoherence of the laser beam was produced by inserting echelons in the beam path and operating the laser at wide bandwidth (0.2%). To produce ISI and non-ISI data for comparison, we irradiated a large number of 180-microm diam gold disks with 0.5-1.5-ns pulses with echelons in the beam path with and without wide laser bandwidths. Our data show an increase in absorption of 5-11% for the ISI illuminated targets and also suggest a weaker dependence of absorption on laser intensity for ISI illumination than for non-ISI.
我们使用能量平衡法，通过一个定制设计的直径30厘米的光积分球，在0.5 - 3.5×10¹⁴瓦/平方厘米的激光强度范围内，测量了高Z靶在诱导空间非相干（ISI）和非ISI照明下的527纳米吸收。通过在光路中插入阶梯光栅并在宽带宽（0.2%）下操作激光器，产生激光束的诱导空间非相干。为了生成用于比较的ISI和非ISI数据，我们用0.5 - 1.5纳秒的脉冲照射大量直径为180微米的金盘，光束路径中有和没有阶梯光栅，激光带宽有宽有窄。我们的数据显示，ISI照明的靶的吸收增加了5 - 11%，并且还表明，与非ISI照明相比，ISI照明下吸收对激光强度的依赖性较弱。
