Laser-induced breakdown studies of laboratory air at 0.266, 0.355, 0.532, and 1.06 μm

We report laser-induced breakdown studies of laboratory air using 0.266, 0.355, 0.532, and 1.06 μm radiation for focal spot varying from 30 to 100 μm. The breakdown intensities were measured for two pulse widths for all four wavelengths. We observe a t−0.5p dependence of pulse width on threshold field at 0.532, 0.355, and 0.266 μm while for 1.06 μm the pulse width dependence of t−0.35p is observed.