Four-frequency polarizing microscope for recording plasma images in the wavelength range 0.4-1.1 μm

摘要

The optical scheme and design of a four-frequency polarizing microscope intended for simultaneous recording of plasma images in the wavelength range 0.4-1.1 μm with the spatial resolution 12 μm in the entire spectral range are described. The effectiveness of such a microscope in studies of plasmas produced on interaction of laser radiation with a target is demonstrated. The plasma images are obtained at the frequencies ω_0, (3/2)ω_0, 2ω_0, and (5/2)ω_0, where ω_0 corresponds to the frequency of heating radiation. The transformation coefficient that characterizes the efficiency of conversion of heating radiation into the 2ω_0, (3/2)ω_0, and (5/2)ω_0 harmonics generated in the plasma is determined.