All polarization-maintaining multi-channel coherent anti-Stokes raman scattering fiber light source

Abstract

The invention provides an all polarization-maintaining multi-channel coherent anti-Stokes raman scattering fiber light source. The all polarization-maintaining multi-channel coherent anti-Stokes ramanscattering fiber light source comprises an all polarization-maintaining main laser, a light amplifier, a beam splitter and a plurality of slave lasers, wherein a gain fiber is arranged in the laser,the light amplifier is used for amplifying pulse laser output from the main laser and then outputting the pulse laser to the beam splitter, the beam splitter is used for dividing the amplified pulse laser into multiple beams, one beam of pulse laser is directly output, the other remaining pulse laser is input to each slave laser, the gain fiber in the laser is used for generating a non-linear effect, the pulse laser output from each slave laser is delayed after the non-linear effect is generated and then is sequentially combined to obtain beam combination light, the beam combination light is combined with the beam of pulse laser directly output and then is output, the main laser, the light amplifier, the beam splitter and the plurality of slave lasers are connected by an all polarization-maintaining fiber light path, so that high-accuracy and high-stable synchronous multi-channel ultrashort pulse is obtained.

Description

technical field [0001] The invention relates to the field of ultrafast optics and laser technology, in particular to a fully polarization-maintaining multi-channel coherent anti-Stokes Raman scattering optical fiber light source. Background technique [0002] Coherent anti-Stokes Raman scattering technology can realize non-invasive and non-labeled detection according to the difference in the vibrational energy level of different material molecules, and is widely used in biomedical imaging, combustion field analysis, pharmacokinetics, disease areas such as detection and early prevention. Traditional coherent anti-Stokes Raman scattering light sources rely heavily on titanium sapphire and solid-state optical parametric oscillators, which can only output dual-color synchronous ultrashort pulse lasers targeting a single vibrational energy level. The solid-state light source system is complex, bulky, and sensitive to environmental interference. It requires an optical ultra-clean...

AI Technical Summary

Problems solved by technology

At present, based on fiber laser, the commonly used method of generating two-color synchronous ultrashort pulse is mainly based on photonic crystal fiber, which uses the high nonlinear effect of photonic crystal fiber to realize the conversion of laser wavelength. For example, four-wave mixing and soliton self-frequency can be used. Shifting, supercontinuum, etc., however, these methods have limitations

The conversion efficiency of four-wave mixing is low. Even through feedback amplification, it can only achieve a parametric conversion efficiency of about 5%. The soliton self-frequency shift must occur in a medium with a negative refractive index, resulting in a laser wavelength It is limited to more than 1250nm; although the supercontinuum method can obtain a broadband spectrum, the power density of each spectral component is low, which puts forward more requirements for detection. In addition, in the process of supercontinuum broadening, various nonlinear Effects compete with each other, resulting in compromised spectral coherence, which is detrimental to coherent detection

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