Brief description of the excitation laser pulses has vapors of the chemical elements and laser pulse putting into application the process

摘要

The excitation circuit produces at least one extra excitation pulse before the main excitation pulse is applied to the gas discharge tube (1) and its amplitude and leading-edge slope are less than those of the main pulse and required to induce lasing at the temps. prevailing in the discharge tube. The extra excitation pulse may be produced either before or simultaneously with each main excitation pulse and its duration is given by a specified equation involving the actual and max. repetition frequencies of the main pulses. The advantage lies in stabilising the laser pulse energy when the repetition frequency is varied over a wide range.