Schematic diagram of the experimental setup.
(a) Emission spectrum generated by the 1064 nm laser showing the spectral lines originating from transitions in the singly ionized and neutral strontium. Each observed line has been appropriately identified. (b) Emission spectrum produced by the 1064 nm laser showing the atomic lines of neutral strontium. The line identification is also marked.
Partial energy level diagrams of (a) singly ionized and (b) neutral strontium. The corresponding wavelengths for each transition are also marked.
Variation of the electron temperature with the laser irradiance using the 1064, 532, and 355 nm lasers at air pressure at 0.3 mm from the target surface.
Variation of the electron number density with the laser irradiance using the 1064, 532, and 355 nm lasers at air pressure at 0.3 mm from the target surface.
Variation in the spectral line intensities as a function of laser irradiance. The laser irradiance is varied from to in ten small steps at air pressure.
Self-absorption effect as a function of the ambient gas pressure for the resonance lines of singly ionized strontium recorded at a distance of 0.6 mm away from the target by using the 1064 nm laser at laser irradiance.
Spectroscopic parameters of strontium used for the measurement of temperature.
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