Laser energy stabilizing device and method based on prefix pulse

Abstract

The invention discloses a laser energy stabilizing device and method based on prefix pulse and belongs to the technical field of laser. The device comprises a main light path and a sampling light path. The main light path comprises a seed light source, a Pockel's cell electro-optic switch, a reflector and a clipping switch. The sampling light path comprises a light intensity adjustable attenuator, a coupler and a light conductive switch. Two ends of the light conductive switch are connected with two poles of the Pockel's cell electro-optic switch. The Pockel's cell electro-optic switch is combined with the light conductive switch, voltage is applied on the Pockel's cell electro-optic switch in advance, a prefix pulse is generated before the main laser pulse, the energy fluctuation of the prefix pulse is utilized to change dynamic resistance of the light conductive resistance to further change actual voltage of two ends of the Pockel's cell electro-optic switch and the transmissivity of the Pockel's cell electro-optic switch, stable control of energy of the main laser pulse is achieved, stability is achieved, and the time waveform of the main laser pulse is free from distortion.

Description

Technical field [0001] The invention relates to the field of laser technology, in particular to a laser energy stabilization device based on a prefix pulse 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 shorter. Therefore, during a pumping process, the amplified laser pulse (main pulse) has the same unstable characteristics as the pulse (prefix pulse) located in the first tens of nanoseconds, 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 based on the energy fluctuation of ...

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

Images