A kind of supercontinuum coupling control device and control method

Abstract

The invention provides a coupling control device for a super-continuum spectrum and a control method. A laser beam outputted from a laser passes through an adjusting unit and then generates reflected light R1, reflected light R2 and transmission light T1 through a reflecting mirror with a wedge angle; the reflected light R1 enters a coupling module to generate the super-continuum spectrum; primary control over the adjusting unit is performed according to a near field of the transmission light T1 and a far field of the reflected light R2; after the primary control is finished, secondary control over the adjusting unit is performed according to information of the super-continuum spectrum; the pointing direction of the reflected light R1 injected into the coupling module is changed by controlling the adjusting unit to generate the super-continuum spectrum. According to the coupling control device and the control method provided by the invention, the problem of dynamic drifting of the super-continuum spectrum caused by fan air current, a vibration environment, mechanical stress and the like can be solved, and stable output of the super-continuum spectrum is realized.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a supercontinuum coupling control device and a control method, which can control the direction of the injected beam according to the near field, far field and supercontinuum of the beam, and realize the stable output of the supercontinuum. Background technique [0002] Optical Parametric Chirped Pulse Amplification (OPCPA) technology uses nonlinear crystals to replace the conventional gain medium in traditional laser amplifiers, which can significantly improve the signal-to-noise ratio of the output pulse, and has the advantages of high gain and wide gain bandwidth. It is expected to further improve the output laser peak power. However, in the OPCPA process, the signal light can be effectively amplified only when the pump light and the signal light are incident into the nonlinear crystal synchronously and the phase matching is satisfied. Therefore, the precise synchro...

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Problems solved by technology

The OPCPA system has strict requirements on the spectral composition of the supercontinuum, and the core diameter of the photonic crystal fiber is very small (such as the NL-PM-750 produced by NKT Company, the core diameter is 1.6±0.3 μm, which is about 1 / 50), which leads to the fact that in the process of generating the supercontinuum, the power focused on the photonic crystal fiber is easily affected by factors such as fan airflow, vibration environment, mechanical stress, etc., which causes the dynamic drift of the output supercontinuum

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