Novel femtosecond optical fiber amplifier

Abstract

The invention discloses a novel femtosecond optical fiber amplifier which is characterized by comprising the components of a femtosecond oscillation output module which is used for outputting polarized light with positive dispersion ray, a pre-compression module which is used for pre-compression and obtaining certain negative dispersion light, a double-clad optical fiber amplifying module which is used for energy amplification and restraining third-order dispersion through phase adjustment, and a secondary compression module which is used for outputting after secondary compression; wherein the femtosecond oscillation output module, the pre-compression module, the double-clad optical fiber amplifying module and the secondary compression module are successively arranged. The novel femtosecond optical fiber amplifier has a compact structure. Two compression modules are used and can perform cooperated adjustment for obtaining an optimal output pulse shape. Firstly, little negative dispersion is introduced into the femtosecond oscillation output module beforehand. Pre-amplification is performed through the pre-compression module. The pulse energy can be effectively amplified, and simultaneously a sidelobe energy caused by the third-order dispersion of an optical pulse after amplification is reduced, thereby obtaining the pulse with an approximate Fourier transform limited shape. The novel femtosecond optical fiber amplifier is particularly suitable for a micro-machining industry which is very sensitive to thermal effect.

Description

[technical field] [0001] The invention relates to a novel femtosecond optical fiber amplifier. [Background technique] [0002] High-power femtosecond lasers have great application prospects in industrial processing, biology and medicine. Compared with solid-state mode-locked lasers, fiber lasers have the following significant advantages: low cost, small size, high efficiency, high beam quality, and high stability. The difference between femtosecond laser amplification based on optical fiber technology and ordinary solid-state amplification is that the high surface area to volume ratio of optical fiber can effectively enhance heat dissipation, and there is no need to introduce water cooling and other means in medium and small power amplification. In recent years, emerging femtosecond laser applications represented by femtosecond laser corneal surgery have put forward new requirements for lasers. In these applications, the single pulse energy of the femtosecond laser is requ...

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Problems solved by technology

However, if there is an obvious third-order dispersion effect in the amplified pulse, it will lead to the introduction of too much thermal effect in the process of processing the corneal flap, which will seriously reduce the processing accuracy and increase the additional damage to the tissue.

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