Calculation of optimum parameters in single frequency LDP intracavity frequency doubled Nd:YAG laser

Abstract

The experiment setup of the laser is shown in Fig. 1. The bireffequent effect of KTP crystal, together with the Brewster-plate(B-plate) function in the cavity as a loss modulator. Define δ-phase delay angle, γ-angle between the polarization orientation of the slow ray in KTP crystal and the P-plane polarization direction of the B-plate. P-polarization is the polarization direction along which the loss that a light wave passes through the B-plate is zero. Previous calculation results from many other literatures show that the optimum value of γ is 45°, with the mode selecting ability of the crystal reaching the peak value.