Structure for lowering linear polarization laser pulse repetition frequency and improving pulse energy

Abstract

A structure for lowering linear polarization laser pulse repetition frequency and improving pulse energy comprises a linear polarization pulse laser source, a high-speed light polarization conversion device and a laser pulse delay light path, wherein the linear polarization pulse laser source is used for emitting pulse lasers of linear polarization; the high-speed light polarization conversion device is located on a light path output by the linear polarization pulse laser source and used for selecting polarization rotating laser pulse sequences in different periods; the laser pulse delay light path is located on a light path output by the high-speed light polarization conversion device and mainly used for adjusting the optical distance of selected pulses, and the arrival time of the basic pulse is matched by adjusting the optical distance of the delay light path, so that energy superposition of the two laser pulses is achieved. According to the structure, on the premise that the total laser power is not changed, introduction of an additional laser device is not needed, pulse energy can be doubled just by lowering the pulse repetition frequency and conducting pulse superposition, and therefore the utilization efficiency of laser power is improved.

Description

technical field [0001] The invention relates to the technical field of pulsed lasers, in particular to a new structure for reducing the pulse repetition frequency of linearly polarized lasers and increasing the pulse energy. Background technique [0002] In pulsed lasers, the repetition frequency of laser pulses is inversely proportional to the pulse energy under the same power conditions. The pulse repetition frequency and pulse energy directly affect the interaction speed of the laser with matter. The adjustment of this parameter is of great significance in the fields of marking, cutting, and scribing in the field of fine processing, long-range laser detection, long-range physical target strike, and laser-induced nuclear fusion. At present, laser pulse repetition frequency adjustment is mainly intracavity adjustment. There are two types of intracavity adjustment. One is active adjustment: it can adjust the pulse repetition frequency of optical modulation devices such as el...

AI Technical Summary

Problems solved by technology

However, for linearly polarized laser pulses without optical fiber amplification, this method cannot reduce the repetition rate and double the pulse energy.

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