Method for improving performance of DKDP crystal pockels cell

Abstract

The invention provides a method for improving the performance of a DKDP crystal pockels cell. Apart from an annular main electrode, an annular auxiliary electrode is arranged at the two ends of an electro-optic crystal respectively so that each end of the crystal has a main electrode and an auxiliary electrode; the auxiliary electrode is arranged between the main electrode and the end surface of the electro-optic crystal; the auxiliary electrode and the main electrode are separated; voltage divider resistors are arranged between the auxiliary electrode and the main electrode at each end of the crystal as well as between two auxiliary electrodes; therefore, when a voltage V is applied between the main electrodes, an auxiliary voltage is applied between the main electrode and the auxiliary electrode through the voltage divider resistor; and the voltage generated by the auxiliary electrode compensates for the voltage unevenness of the end surface of the dual-electrode crystal by using the voltage characteristics of the annular electrode. The method of the invention can effectively improve the evenness of the radial extinction ratio of the electro-optical switch; and when the method is used in a Q switching pulse laser, the light leak of the electro-optical switch can be reduced, the output laser pulse width is compressed, the output ratio of Q-switching to free running is improved and the laser output power can be increased.

Description

technical field [0001] The invention relates to a method for improving the performance of a DKDP electro-optic crystal Pockels cell by using multi-electrodes, and belongs to the technical field of electro-optic switches. Background technique [0002] When the DKDP electro-optic crystal (hereinafter referred to as the crystal) is used as a Pockels cell, a pair of ring-shaped electrodes are generally used, and this pair of electrodes is called the main electrode, such as figure 1 As shown, a ring-shaped main electrode 2 is provided at both ends of the crystal 1 respectively. figure 1 The Z-axis of the coordinate system shown is the direction of light transmission. A voltage V is applied between the two main electrodes 2. When a beam of linearly polarized light parallel to the X-axis or Y-axis enters the crystal 1, the beam of light Polarized light can be decomposed into two beams of linearly polarized light perpendicular to each other. According to the characteristics of the ...

AI Technical Summary

Problems solved by technology

[0018] Aiming at the problem that the inhomogeneity of the ring electrode crystal end face voltage existing in the existing DKDP electro-optic crystal Pockels cell has an impact on the extinction ratio of the electro-optic crystal, the present invention provides a method that can compensate for the inhomogeneity of the double-electrode voltage and improve the DKDP crystal. Methods for Pockels Cell Properties

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