Burst-pulse-mode ultra-fast laser and working method thereof

Abstract

The invention relates to a burst-pulse-mode ultra-fast laser and a working method thereof. The ultra-fast laser comprises a radio frequency source, a laser oscillator, an optical fiber coupling acousto-optic / electro-optic modulator, an acousto-optic / electro-optic modulation driver, a first-stage main oscillation amplifier, an acousto-optic modulator and an acousto-optic modulation driver. The laser oscillator, the optical fiber coupling acousto-optic / electro-optic modulator, the first-stage main oscillation amplifier and the acousto-optic modulator are arranged along an optical path in sequence. The acousto-optic / electro-optic modulation driver is connected with the optical fiber coupling acousto-optic / electro-optic modulator; and the acousto-optic modulation driver is connected with the acousto-optic modulator. A light beam is output from the laser oscillator having stable pulse repetition frequency frep; the pulse repetition frequency is reduced to frep / n through the optical fiber coupling acousto-optic / electro-optic modulator; then, the light beam is amplified by the first-stage main oscillation amplifier; and finally, the acousto-optic modulator produces a burst pulse mode.

Description

technical field [0001] The invention relates to a burst pulse mode ultrafast laser and a working method thereof, belonging to the technical field of ultrafast lasers. Background technique [0002] Ultrafast lasers are key technologies in many industrial processing, free electron lasers, electron accelerators and other fields. Mode-locked lasers can generate ultrafast pulses, but their output energy is generally on the order of nanojoules, which is difficult to apply directly. To realize the practical application of ultrafast lasers, it is mainly necessary to solve the problem of low output power. The commonly used amplification technique is the master oscillator power amplification system (MOPA). In most MOPA designs, there is a contradiction between the gain saturation caused by achieving high efficiency and the need for a sufficiently large gain to achieve high amplification. That is to say, in order to increase the output power, MOPA requires a high gain, and the high p...

AI Technical Summary

Problems solved by technology

Moreover, in order to maintain high power output for a long time, not only the heat accumulation effect occurs in the laser medium, but also the heat is accumulated on the receptor due to the action of continuous pulse trains, which not only changes the output characteristics of the laser itself , will also change the characteristics of the receptor substance itself, which is difficult to control and is not conducive to practical application in industry and commerce

[0003] From the above discussion, it can be concluded that at present, there are two main problems in ultrafast lasers that restrict its commercial and industrial development: first, the gain saturation of the gain medium makes the output power of the laser lose the space for further improvement; second 2. During the operation, the thermal efficiency of the laser amplification medium and the heat accumulation caused by the continuous pulse train change the reliability and stability of the laser

Images