An intensity dependence of the absorption of 10-{μ} m laser light on CO₂-laser-fusion targets has been observed. Absorption on gold spheres increases from 25%-30% at 10¹⁴ W/cm² to 50%-60% at 10¹⁶ W/cm², with most of the variation occurring above 10¹⁵ W/cm². Concurrently, hot-electron temperature scales as Tₕₒₜ∝I0.43 over the entire range. The absorption variation is interpreted as enhanced resonant absorption. It is suggested that as intensity is increased, the critical surface in the irradiated region becomes increasingly unstable, thereby permitting greater surface distortion and more favorable coupling conditions for resonant absorption.
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Bach et al. (1983) studied this question.
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