Time-Resolved Spectroscopy Diagnostic of Laser-Induced Optical Breakdown

Figure 4

Recorded H_𝛽 emission in laboratory air. The insert shows H_𝛽 full-width-at-half-maximum of 3 nm, and a peak separation of 1 nm; consequently, the electron number density amounts to N_e≅0.5×10¹⁷cm⁻³.