A laser energy stabilization device and energy stabilization method based on prefix pulse

Abstract

The invention discloses a laser energy stabilizing device based on a prefix pulse and an energy stabilizing method thereof, belonging to the field of laser technology, comprising a main optical path and a sampling optical path, the main optical path includes a seed light source, a Pockels cell electro-optical switch, and a clipping switch , the sampling optical path includes sequentially arranged: a beam splitter, an adjustable light intensity attenuator, a photoconductive switch, and the two ends of the photoconductive switch are respectively connected with the two poles of the Pockels cell electro-optic switch. The Kerr cell electro-optic switch is combined with the photoconductive switch, the voltage is applied to the Pockels cell electro-optic switch in advance, a prefix pulse is generated before the main laser pulse, and the energy fluctuation of the prefix pulse is used to change the dynamic resistance of the photoconductive switch. In this way, the actual voltage of the Pockels cell electro-optic switch and the transmittance of the Pockels cell electro-optic switch are changed, and the energy stable control of the main laser pulse is realized. .

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a prefix pulse-based laser energy stabilization device and an energy stabilization method thereof. Background technique [0002] Generally, the pump pulse width of a pulsed laser system is on the order of microseconds, while the width of the laser pulse is on the order of nanoseconds, or even shorter. Therefore, in a pumping process, the amplified laser pulse (main pulse) has the same unstable characteristics as the pulse located tens of nanoseconds before it (prefix pulse), and can be regarded as the same laser. [0003] The traditional method of stabilizing laser pulse energy is to measure the laser pulse energy and compare it with the target energy, and adjust the controller or driving power upstream of the optical path according to the difference between the test energy and the target energy. This method can only correct the next laser pulse according to the energy fluctuatio...

AI Technical Summary

Problems solved by technology

It uses a fast photoelectric sampling gate to obtain laser pulse sampling signals, outputs a low-voltage electrical pulse that is linearly proportional to the laser pulse amplitude, and then amplifies it into a high-voltage electrical pulse through a linear electrical pulse high-voltage amplifier and loads it on the electrode of the Pockels cell electro-optic switch. The linear amplification area of ​​the high-voltage amplifier circuit is limited, which affects the energy control accuracy

The laser pulse and the high-voltage pulse reach the Pockels cell electro-optical switch synchronously, and the time change of the laser pulse will be converted into the time change of the high-voltage driving pulse, which in turn changes the time waveform of the laser pulse to be stabilized, resulting in time waveform distortion

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