A Nd:YAG pulsed laser is used to ablate HgCdTe target at different ambient pressures, the emission spectrum is detected by a time- and space-resolved diagnostic technique. It is found that the characteristics of time-resolved emission spectra are influenced by the pressure of background gas. A theoretical model is developed to investigate expansion mechanism of plasma, the time evolution of the propagation distances and the velocities of plasma plume are calculated by the model at pressures of 101000, 1000, and 5 Pa, respectively. The calculated results are well consistent with the experimental data.
© 2006 Chinese Optics Letters
(000.4430) General : Numerical approximation and analysis
(010.1320) Atmospheric and oceanic optics : Atmospheric transmittance
(020.3690) Atomic and molecular physics : Line shapes and shifts
(300.6500) Spectroscopy : Spectroscopy, time-resolved
Yongqiang Zhang, Chuansong Chen, Xinling Zhou, Juan Guo, Qinggang Zhang, and Baoyuan Man, "Influence of ambient pressure on properties and expansion of laser-induced plasma," Chin. Opt. Lett. 4, 493-496 (2006)