Method for realizing high repetition frequency electro-optic Q-switching of solid laser based on periodic polar crystal

Abstract

The invention relates to a method of electro-optic Q-switching of a solid laser, and in particular to a method for realizing high repetition frequency electro-optic Q-switching by using a periodic polar crystal as an electro-optic Q switch. The method at least comprises a pumping source, a coupling system and a resonant cavity which form the laser. The resonant cavity comprises a laser medium and an output mirror, wherein two isodirectional polaroids are arranged between the laser medium and the output mirror; and the periodic polar crystal is arranged between the two polaroids. The method is characterized in that voltage is loaded on the periodic polar crystal through a back-pressure type Q switch power supply so that the crystal axial direction of each electric domain just defects to the angle theta capable of realizing oscillation laser Saco filtration, then the polarization direction of the oscillation laser through the periodic polar crystal rotates by 90 degrees, failing to form oscillation through the second isodirectional polaroid; as a result, the energy-level particles on the laser medium are accumulated; when the on-load voltage loses transiently, the resonant cavity starts oscillation rapidly to form laser pulse and output. In the invention, the required on-load voltage is relatively low, therefore the operation of the high repetition frequency electro-optic Q-switching of the solid laser is easily achieved.

Description

technical field [0001] The invention relates to an electro-optic Q-switching method for a solid-state laser, in particular to a high-repetition-frequency electro-optic Q-switching method using a periodically polarized crystal as an electro-optic Q switch. Background technique [0002] Q-switching technology is an effective means to realize compressed output laser pulse width and increase peak power. It is divided according to different Q-switching operation modes, mainly including: electro-optic Q-switching, acousto-optic Q-switching and passive Q-switching. High repetition rate Q-switched solid-state lasers are widely used in many fields such as industrial production, scientific research, military affairs, and medical treatment. At present, most commercially mature high repetition rate Q-switched solid-state lasers use acousto-optic or passive Q-switching technology. The typical value of output pulse laser repetition frequency is kilohertz to hundreds of kilohertz. But the...

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Problems solved by technology

However, due to the constraints of the conductivity value, electro-optic coefficient, piezoelectric effect and other factors of the nonlinear crystal itself, the traditional electro-optic Q-switching requires a high voltage to be applied to the crystal to achieve the Q-switching effect, such as KD * P crystal needs greater than 4000 volts, LiNbO 3 The crystal needs to be greater than 2000 volts, and the small-sized RTP crystal also needs hundreds of volts. The high voltage severely limits the turn-off speed of the electro-optic Q switch, making it difficult to effectively increase its repetition rate, which also hinders the further development of high repetition frequency electro-optic Q-switching technology. The main bottleneck problem of popularization and application

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