Device and method using pulse accumulation and amplification to realize high power ultrashort pulse laser

Abstract

The invention discloses a device and method using pulse accumulation and amplification to realize a high power ultrashort pulse laser. The device comprises a pulse laser beam splitting system, a pulse amplification system, a continuous laser beam splitting system, a carrier envelope phase synchronization system and a balance optical cross-correlation pulse accumulation and amplification system. The method comprises the steps of: splitting the pulse laser into a plurality of paths; respectively amplifying or compressing each path of the laser to obtain a plurality of paths of ultrashort pulses relatively high in power; locking the amplified plurality of paths of ultrashort pulses relatively high in power onto one path by means of frequency beating with a continuous laser device and circuit frequency mixing so as to realize carrier envelope phase synchronization of the plurality of paths of pulse lasers; and finally, performing coherent combination on the plurality of paths of pulse lasers through a balance optical cross-correlation technology, realizing the accumulation and amplification of the plurality of paths of pulse lasers, and outputting the ultrahigh power ultrashort pulses.

Description

technical field [0001] The invention relates to the field of ultrafast optics and laser technology, in particular to a device and method for realizing high-power ultrashort pulse laser by means of pulse stacking amplification. Background technique [0002] High-power ultrashort pulse laser sources are widely used in industrial manufacturing and scientific research. It is often used in scientific fields such as material detection and astronomical observation, and it is also commonly used in industrial production for processing and manufacturing. Common types of lasers in the prior art, high-power fiber pulse lasers have many advantages such as narrow pulse width, high repetition frequency, high average power, and high single pulse energy. In particular, the ultrashort pulse laser obtained by the fiber mode-locked pulse laser source and fiber amplifier has the advantages of small size, high amplification gain, wide spectral range, simple structure, and low price, and has broad...

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Problems solved by technology

[0003] The problem is that the common wavelength bands of fiber mode-locked lasers are 1030nm, 1064nm, 1550nm, and 1310nm. short pulse

In this method, the pulsed laser has to pass through multi-stage amplifiers and gain fibers in sequence, and more nonlinear chirp is introduced. Even if a multi-channel chirp management module is introduced, it is difficult to compress the pulse width to less than 100 fs. At the same time, the high-power amplifier It is also limited by the gain bandwidth, and the spectrum is narrowed after the ultrashort pulse is amplified

The self-similar amplification technology proposed in recent years can achieve spectral broadening and pulse compression to obtain high-power ultrashort pulses of tens of femtoseconds, but this method is limited by factors such as mode instability and thermal effects in the fiber amplifier, and it is also unable to obtain more than 100W high power ultrashort pulse

[0004] Limited by the above problems, stable high-power ultrashort pulse laser sources are difficult to obtain. Scholars from various countries are committed to developing high-performance gain fibers to reduce mode instability and thermal effects in order to obtain higher power and narrower pulses. , the current results are not ideal

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