Multi-point output cars excitation source device and generation method based on multi-soliton synchronous scanning

Abstract

The invention discloses a multi-point output CARS excitation source device and generation method based on multi-soliton synchronous scan. The method comprises the steps that femtosecond pulses are generated through a fiber laser, and power adjustability and polarization are achieved after the pulses passe a liquid crystal delayer and a polarization beam splitter; one pulse generates multiple optical solitons through pohotonic crystal fiber, chirp spectrum compression is conducted through GI-MMF and SMF in sequence, and all compressed optical solitons are filtered out in sequence through a circulator and fiber bragg grating; the other pulse serves as pump light and is coupled into the GI-MMF and the SMF to be subjected to chirp spectrum compression and then split through a fiber beam splitter to form multiple beams of light; electric-control adjustment is conducted to multiple fiber delay lines, and meanwhile the pump light is synchronous with pulses of all the optical solitons; finallybeam combination output is conducted separately, and a multi-point output CARS excitation source is constituted. According to the multi-point output CARS excitation source device and generation method based on the multi-soliton synchronous scan, synchronous scan of multiple solitons can be achieved, multiple CARS signals can be detected simultaneously, the CARS signal detection efficiency is greatly improved, and the device is compact in structure and high in environment anti-interference performance and can serve the field of CARS microimaging.

Description

technical field [0001] The invention relates to the field of nonlinear optics, in particular to a multi-point output CARS excitation source device and method. Background technique [0002] Coherent anti-Stokes Raman scattering (CARS) technology uses nonlinear optical four-wave mixing to detect the Raman vibration spectrum of molecules, usually using two beams of pump and Stokes light to excite the sample. When the frequency difference between the pump light and the Stokes light is equal to the vibration frequency of the chemical bond of the sample and the phase matching condition is met, the anti-Stokes light will be excited, which is the CARS signal that the CARS microscopic imaging technology needs to detect. . However, as a traditional CARS signal-based space optical CARS excitation source device based on a solid-state laser, it is bulky, poorly stable, expensive, and requires dedicated maintenance. These problems limit its popularization and application. [0003] Anot...

AI Technical Summary

Problems solved by technology

These optical solitons are incident on the sample together, which will affect the generation of CARS signal and reduce the imaging quality. Therefore, in the existing CARS excitation source system, usually only the fundamental order soliton is used as the Stokes optical pulse, while the rest Only one CARS signal can be detected in real time, so that the real-time detection range is limited, and the power loss is large, and the role of other optical solitons is ignored.

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