A high repetition rate ultrafast laser pulse train generating device and its control method

Abstract

The present invention discloses a high-repetition frequency ultrafast laser pulse train generating device and a control method thereof. The method disclosed by the present invention is characterized in that: a linear resonant cavity or a ring resonant cavity is used, one mirror of which is a partially transmissive mirror and is taken as an output mirror, each time a pulsed laser is output to the output mirror, an output pulse will be output to form an output pulse train, and the number of output pulse trains that satisfy the requirement is obtained by controlling the high-voltage duration of the Pockels cell; by controlling the gain of the laser pulse by using an energy supply device in the resonant cavity, the energy of the output pulse train that satisfies the requirement is obtained; and the high-repetition frequency output pulse train is a double-structured pulse train containing high-repetition rate sub-pulse trains in a low-repetition frequency pulse envelope, wherein the repetition frequency of the pulse envelope is determined by a repetition frequency conversion system, and the repetition frequency of the sub-pulse in each pulse envelope is determined by the length of the ring resonant cavity.

Description

technical field [0001] The invention relates to femtosecond laser technology, in particular to a high repetition rate ultrafast laser pulse train generating device and a control method thereof. Background technique [0002] The average laser pulse power is the product of single pulse energy and repetition rate. Considering thermal effects, the average power of laser pulses cannot be increased infinitely. When the laser outputs high energy, the repetition rate must be sacrificed, and it is difficult to obtain high energy to obtain a high repetition rate. In the current laser technology, the oscillator can output laser on the order of tens of MHz, but the energy is usually on the order of ten nJ, and the amplifier can obtain higher energy, but the highest repetition rate is on the order of hundreds of KHz. Due to the bottleneck of thermal effects, it is difficult to obtain laser pulses with MHz repetition frequency and tens of uJ at the same time. However, in practical appl...

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Problems solved by technology

Considering the thermal effect, the average laser pulse power cannot be increased infinitely

When the laser outputs high energy, the repetition rate must be sacrificed, and it is difficult to obtain high energy in order to obtain a high repetition rate

In the current laser technology, the oscillator can output laser on the order of tens of MHz, but the energy is usually on the order of ten nJ, and the amplifier can obtain higher energy, but the highest repetition rate is on the order of hundreds of KHz.

Due to the bottleneck of thermal effects, it is difficult to obtain MHz repetition frequency and laser pulses of tens of uJ at the same time

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