Nanosecond light pulsers have been developed which are simple to construct and use. The lamps are of gaseous discharge type operated in relaxation mode. The characteristics of discharges of such gases as nitrogen and hydrogen are measured in the pressure range from 1 to 20kg/cm
2. It is observed that the pulse brightness as well as the half height pulse width increases with pressure and gap width. The satisfactory maintenance to obtain intense, stable pulses is bound to be a pressure of about 5kg/cm
2 which results in minimum stray capacitance for lamps with 0.1mm gap width. The lamp filled with nitrogen yields light pulses with half-width of 2 nsec or less under the condition mentioned above.
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