Abstract
A dual-wavelength femtosecond double-pulse laser is used to induce the Cu plasma spectroscopy in air. The laser wavelengths are a fundamental wavelength (800nm) and a second harmonic wavelength (400nm) from Ti:sapphire laser. The inter-pulse delay of double-pulse is from −300ps to 160ps. The observed spectral intensity is dependent on the inter-pulse delay of the dual-wavelength femtosecond double-pulse. We analyze the characteristics of the plasma temperature and the electron number density on the inter-pulse delay of double-pulse with two different wavelengths. For 800nm+400nm, the spectral emission enhancement is based on more material ablation. For 400nm+800nm, the enhanced mechanism is plasma reheating effect. This study will provide a better way to understand the mechanism of femtosecond double-pulse LIBS.
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