Dual-wavelength pumping middle-infrared four-wave mixing fiber laser of all-fiber structure

Abstract

The invention relates to the technical field of middle-infrared band laser, in particular to a dual-wavelength pumping middle-infrared four-wave mixing fiber laser of an all-fiber structure. The dual-wavelength pumping middle-infrared four-wave mixing fiber laser of the all-fiber structure comprises a pulse fiber laser, a continuous fiber laser, a wavelength division multiplexer and a non-linear soft glass fiber; pump light generated by the pulse fiber laser and anti-Stokes signal light generated by the continuous fiber laser are coupled through the wavelength division multiplexer for being transmitted in the non-linear soft glass fiber and generating a degeneration four-wave mixing effect, and finally middle-infrared band Stokes lasers are obtained. The dual-wavelength pumping middle-infrared four-wave mixing fiber laser is of the all-fiber structure, thereby simplifying the overall design and improving the coupling efficiency of pumping lasers; the pulse fiber laser is adopted for pumping, so that quite high peak power is provided, and the length of the middle-infrared soft glass fiber can be reduced; the anti-Stokes signal light is output continuously, and therefore the problem of time synchronization between the pumping light and the signal light does not need to be considered.

Description

technical field [0001] The invention relates to the technical field of mid-infrared band lasers, in particular to an all-fiber structure dual-wavelength pumped mid-infrared four-wave frequency mixing fiber laser. Background technique [0002] Mid-infrared band lasers specifically refer to lasers with operating wavelengths in the 2-5 μm band, and their applications include environmental detection, biomedicine, free space optical communications, infrared band spectroscopy, homeland security and other fields. At present, the technical means for obtaining mid-infrared laser can be mainly divided into five categories: optical parametric oscillators, gas and chemical laser frequency doubling methods, rare earth-doped soft glass fiber lasers, semiconductor quantum cascade lasers and supercontinuum laser sources. The above technical means have their own advantages and disadvantages. In comparison: optical parametric oscillators and gas and chemical laser frequency doubling methods i...

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Problems solved by technology

However, these reported mid-infrared soft glass fiber lasers based on the four-wave mixing effect have obvious shortcomings: on the one hand, they all use a spatial structure, and the pump light needs to be coupled into the nonlinear fiber through a lens, so that the pump The optical coupling efficiency and the obtained mid-infrared laser conversion efficiency are low; on the other hand, although the introduction of feedback through the optical resonator can improve the conversion efficiency of the pump laser to the mid-infrared laser and reduce the conversion threshold, it is necessary to To realize the time synchronization of the feedback light and the pump light, the repetition rate of the pump light and the optical path of the entire laser cavity have to be specially considered, which inevitably increases the complexity of the system

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