Studies of problems connected with wide scan dye laser spectroscopy

Abstract The nonlinearity of a galvo-controlled laser frequency scanning Brewster plate has been studied. A theoretical treatment for the deviation from linearity due to rotation of the Brewster plate in the laser resonator is presented. The calculations are based on the difference between the optical length at any selected incident angle and that at Brewster angle. A basic computer program has been developed to calculate the following parameters: the optical length, deviation from linearity, driving current, free spectral range, and frequency change as a function of the incident angle. Furthermore, calculations for increasing the tuning range of laser resonator frequencies using a beam compensated displaced glass wedge and its losses as a function of wavelength are discussed.