It is nanosecond impulse ultraviolet spectrum and quasi-molecular laser comprises arc chamber, parallel-plate capacitor, trigger sphere gap, high-tension supply, small inductance coil, complete resonance lens and output resonance lens, which is characterized by the following: the edge electrodes of the discharged positive electrode and negative electrode of the said arc chamber are separately connected with C#-[1] and C#-[2] of parallel -plate capacitor; the discharged positive edge curvature radius R varies from 1.5 to 3 millimeter and the radius R of the discharged negative edge varies from 1 to 1.5 millimeter; The arc chamber is filled with mixture gas with mainly helium and gas pressure 300mmHg-400mmHg. As experience shows the nanosecond impulse ultraviolet spectrum laser in this invention can eradiate the abundance ultraviolet monochromatic spectrum with high lightness which in larger than the xenon lamp or mercury lamp with 2 to 4 magnitude. |