Electrooptic tuning of the output frequency of a flashlamppumped liquid dye laser

A theoretical study is reported of two types of electrooptic interference-polarization filters operating on beams propagating at small angles to the optic axis. It is shown that the maximum tuning rate, amounting to 86 nm/kV, can be achieved by employing the longitudinal field geometry in an electrooptic DKDP crystal. Experimental results are reported on tuning of the emission frequency over a range of 30 nm in the case of a flashlamp-pumped laser whose active medium is a solution of rhodamine 6G in ethanol.