Optical emission from laser-produced chromium and magnesium plasma under the effect of two sequential laser pulses

Pramana

V N Rai1¹  F Y Yueh²  J P Singh² 

[1] Laser Plasma Division, Centre for Advanced Technology, Indore 452 013, India$$;Diagnostic Instrumentation and Analysis Laboratory, Mississippi State University, 205 Research Boulevard, Starkville, MS 39759, USA$$

关键词: Laser–plasma interaction;    laser-induced breakdown spectroscopy;    plasma heating;    visible emission.;   

DOI  :  

学科分类：物理（综合）

来源: Indian Academy of Sciences

【 摘 要 】

Parametric study of optical emission from two successive laser pulses produced chromium and magnesium plasma is presented. The line emission from chromium and magnesium plasma showed an increase by more than six times for double laser pulse excitation than for single-pulse excitation. An optimum increase in emission intensity was noted for inter-pulse delay of ∼ 2–3 𝜇s for all the elements. The experimental observations were qualitatively explained on the basis of absorption of second laser pulse in the pre-formed (by first laser) coronal plasma by inverse Bremsstrahlung process, which were found responsible for the excitation of more ions and atoms in the plasma. This process starts as the plasma scale length becomes greater than the laser wavelength. This study further indicated the suitability of this technique in the field of elemental analysis.

【 授权许可】

Unknown