Characterization of near-infrared low energy ultra-short laserpulses for portable applications of laser induced breakdownspectroscopy

摘要

We report on the delivery of low energy ultra-short (<1 ps) laser pulses for laser induced breakdownspectroscopy (LIES). Ultra-short pulses have the advantage of high peak irradiance even at very low pulseenergies. This opens the possibility to use compact, rare-earth doped fiber lasers in a portable platform forpoint detection applications using LIBS for elemental analysis. The use of low energy ultra-short pulsesminimizes the generation of a broad continuum background in the emission spectrum, which permits the use ofnon-gated detection schemes using very simple and compact spectrometers rather than large and delicateintensified charge-coupled devices (ICCDs). The pulse energies used to produce high-quality LIBS spectra inthis investigation are some of the lowest reported and we investigate the threshold pulse requirements for anumber of near IR pulse wavelengths (785-1500 nm) and observe that the pulse wavelength has