High-power mid-infrared tunable femtosecond laser generating device

Abstract

The invention belongs to the technical field of infrared femtosecond laser, and discloses a high-power mid-infrared tunable femtosecond laser generation device, which comprises a pumping module, an OPO (optical parametric oscillation) module, a femtosecond laser generation module, a femtosecond laser generation module and a femtosecond laser generation module, the optical parametric oscillation (OPO) module is used for converting input laser (pump light) into two low-frequency output light (signal light and idler frequency light); and the difference frequency generation (DFG) module is used for performing difference frequency on the two laser beams generated by the OPO module to generate high-power intermediate infrared tunable femtosecond laser. High-power mid-infrared tunable femtosecond laser is obtained in an OPO + DFG combined mode, tunable signal light and idler frequency light are generated by pumping the OPO through a high-power femtosecond oscillator, and the tunable signal light and the idler frequency light serve as pumping light and signal light needed by difference frequency generation respectively and are injected into a mid-infrared nonlinear crystal to obtain high-power femtosecond laser. Therefore, the output mid-infrared femtosecond laser has the characteristics of high power and tunability.

Description

technical field [0001] The invention belongs to the technical field of infrared femtosecond lasers, and in particular relates to a high-power mid-infrared tunable femtosecond laser generating device. Background technique [0002] At present: mid-infrared is located in the spectral wavelength range of 3-20 μm, among which, the absorption characteristics of 3-5 μm mid-infrared laser in atmospheric molecules make this band laser have important application value in military, medical, remote sensing, communication and industrial processing and other fields In recent years, a lot of research work has been carried out around mid-infrared wavelength lasers. Further, the mid-infrared ultrashort pulse laser can reach the femtosecond level due to its extremely short pulse width, and after amplification, the advantage of extremely high pulse peak power can realize free space optical communication, trace gas detection, and environmental monitoring The demand for light sources in various...

AI Technical Summary

Problems solved by technology

[0006] Through the above analysis, the existing problems and defects of the existing technology are: low output power, narrow tuning range and high requirements for nonlinear crystals in the existing technology for producing mid-infrared femtosecond lasers

[0007] The difficulty in solving the above problems and defects is: on the one hand, the requirements for nonlinear crystals are high. If a 1 μm high-power ytterbium-doped femtosecond laser is used for pumping, if the existing crystal is highly transparent to 1 μm, it will be caused by multi-photon absorption. The long-wavelength wavelength is limited to 4-5μm, and it is impossible to directly generate high-power laser with longer wavelength, but the ZGP crystal with extremely excellent optical properties that can produce long-wavelength mid-infrared output is opaque in the band below 2μm, and cannot be directly pumped by a 1μm laser Pu

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