CPM LASER WITH ELECTRONIC FEEDBACK

In order to improve both the reliability and stability of the conventional colliding pulse mode-locked (CPM) laser the authors have added an electronic feedback to the system. By linking the integrated output of the CPM laser to the output of the Ar+ laser the average energy in the CPM cavity is kept constant. In this way, the stability of the CPM laser can be maintained for several days on an optical table of moderate quality. In addition, the alignment is substantially easier and the pulse height distribution of the autocorrelation function is improved by a factor of two due to the feedback loop.