A 3-cm-long curved Ge slab target was irradiated by 1.053 {μ}m glass laser light with irradiance of 2.9 ×{} 10³ W/cm². The 19.6 nm laser line due to the 3p→3s, J=0→1 transition in Ne-like Ge ions was found to be polarized parallel to the target surface, with a degree of polarization of -53%. This polarization is accounted for by the anisotropy in the radiation trapping of the resonance line in an expanding plasma, which has a velocity gradient in the direction normal to the target surface.
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Kawachi et al. (1995) studied this question.
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