Ultra-short pulse fiber laser system using graphene saturable absorber to lock mode

Abstract

The invention discloses an ultra-short pulse fiber laser system using a graphene saturable absorber to lock a mode. The ultra-short pulse fiber laser system comprises a ring fiber laser seed source and a chirped amplifier, wherein the ring fiber laser seed source comprises the graphene saturable absorber, a wavelength division multiplexer, a Yb doped active fiber, a first passive fiber, an output coupler, a band-pass filter, an optical isolator and a second passive fiber; the chirped amplifier comprises a first-stage stretcher, a first-stage amplifier and a negative dispersion element; and the first-stage amplifier is composed of an active fiber, a beam combiner and a pumping source. The ring fiber laser seed source provided by the invention can output linearly chirped pulses, and these linearly chirped pulses can be amplified and de-chirped under the amplification of the chirped amplifier and the compensation action of the negative dispersion element, so as to obtain femtosecond pulses, and a Yb doped femtosecond fiber laser can be realized. The ultra-short pulse fiber laser system using the graphene saturable absorber to lock the mode provided by the invention fills the technical gap of the Yb doped femtosecond fiber laser.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to an ultra-short pulse fiber laser system mode-locked with a graphene saturated absorber. Background technique [0002] Ultra-short pulse (pulse width less than 10ps) processing is cold processing, which eliminates the thermal effect on the surrounding area of ​​processing and improves processing accuracy, while high power helps to increase processing speed. Based on the above advantages, ultrashort pulse processing has gradually been applied in the field of micromachining. In order to meet the needs of the application, it is urgent to develop a high-power ultrashort pulse fiber laser. [0003] At present, the best way to produce ultrashort (femtosecond) fiber laser is to use passive saturable absorber plus gain fiber. In the past, semiconductor saturable absorber mirror (SESAM) was often used as a saturable absorber. Its disadvantage is that it requires complex processes, such as...

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Problems solved by technology

At present, there are samples of Er-doped femtosecond fiber laser with graphene film, but there is no sample of Yb-doped femtosecond fiber laser with graphene film.

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