研究目的
The goal of the present work was to determine the optimal conditions for dual-pulse laser action with λ = 532 and 1064 nm on Ti in air at atmospheric pressure to produce the highest temperature and electron concentration of the resulting ablation plasma and highest speci? c mass loss, luminosity, and plasma torch height.
研究成果
Optical and spectroscopic studies established the effects of the sequence of and time interval between LR pulses at two wavelengths on the parameters and structure of the near-surface laser plasma formed by them. The highest temperatures and electron concentrations in ablation plasma from Ti in air using paired laser pulses at 1064 and 532 nm with controlled time intervals and sequences were attained for initial action of short-wavelength LR. Thus, initial action of second-harmonic LR with λ = 532 nm and time interval of 3–5 μs between pulses gave predominantly laser ablation plasma and the optimal conditions for recording Ti emission spectra.
研究不足
The physics of LR interaction with matter are de? ned not only by the LR power density but also the laser pulse rate. If the laser pulse rate was increased (>5 kHz), primarily ablation plasma with several times the pressure formed on the target surface.
