研究目的
Investigating the spectra and structure of near-surface plasma formation under the action of two laser pulses at two wavelengths on a titanium target in the air, and establishing the dependences of the laser plasma temperature on the parameters of paired laser pulses.
研究成果
The study demonstrated that optimal conditions for recording the erosion plasma spectra are achieved with a leading effect of second harmonic radiation and a specific time interval between laser pulses. This finding is significant for enhancing the efficiency of laser emission spectral analysis and laser-plasma material processing.
研究不足
The study is limited to the specific conditions of laser radiation power densities and wavelengths, and the effects observed may vary with different materials or environmental conditions.
1：Experimental Design and Method Selection:
The study utilized a two-pulse laser effect at wavelengths of 532 and 1064 nm on a titanium target in the air, with varying time intervals between pulses and their order.
2：Sample Selection and Data Sources:
A titanium target was used, with spectra of near-surface plasma, specific mass removal, luminosity, and time-integrated photographs of the plasma plume recorded.
3：List of Experimental Equipment and Materials:
Included two YAG:Nd-lasers, a synchronization unit, focusing lenses, a spectrometer with a CCD receiver, a photomultiplier tube, and digital oscilloscopes.
4：Experimental Procedures and Operational Workflow:
Laser radiation was focused on the titanium target, with spectra and plasma parameters recorded under controlled conditions.
5：Data Analysis Methods:
The temperature of titanium plasma was determined using the method of relative intensities of spectral lines, with calculations based on known physical quantities.
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