Hybrid-electrode Pockel's cell and time-sharing loop-sharing driving method

Abstract

The invention discloses a hybrid-electrode Pockel's cell and a time-sharing loop-sharing driving method. Efficient cooling and low-voltage fast-response driving of the Pockel's cell are realized. The basic structure of the hybrid-electrode Pockel's cell is a sandwich structure in which a z-cut DKDP crystal is sandwiched between a discharge chamber and a high-reflectivity mirror. Longitudinal electro-optic effect use and longitudinal conduction cooling are adopted. The discharge chamber is used as an electrode at the laser incidence side. The high-reflectivity mirror integrates the functions of a mirror, a heat sink and an electrode. The diameter of the Pockel's cell can be calibrated and amplified. The Pockel's cell can bear high average power density, and can operate at high throughput and at repeated frequency. The Pockel's cell has low driving voltage, and is quick in response. The Pockel's cell is applicable to a high-energy repeated-frequency laser system.

Description

technical field [0001] The invention belongs to the technical field of high-energy repetition-frequency lasers, and in particular relates to a mixed-electrode Pockels cell which can be used in high-energy repetition-frequency laser systems, which can be calibrated and enlarged, can withstand high average power density, and can operate at a high-flux repetition frequency. , and the time-division loop driving method of this Pockels cell. Background technique [0002] In recent years, driven by the demand for high-energy density physics research and fusion energy research, diode-pumped high-energy repetition-frequency solid-state laser technology has developed rapidly, and has achieved output of about 100J and 10Hz. Limited by the pumping power of the diode, the laser driver usually uses a gain medium with a longer upper energy level lifetime. According to Einstein's radiation theory, a long upper energy level lifetime means a smaller stimulated emission cross section. In order...

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Problems solved by technology

The switch crystal and the heat sink are sealed by direct contact mechanical compression. The direct contact sealing method has the following problems: the damage of the sol-gel anti-reflection film plated on the crystal; the stress generated in the crystal after compression Reduced switch static extinction ratio; thermal stress due to limited thermal expansion of the crystal in high average power applications results in higher switching thermal depolarization losses

In addition, the switch uses metal as the backside electrode, which has the advantages of good electrical conductivity and high thermal conductivity, but it is used as a mirror at the same time, and the damage threshold is too low, so it cannot be applied under high-flux conditions

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