All-Fiber Low Repetition Frequency Parametric Oscillator for Stimulated Raman Scattering

Abstract

The invention relates to an all optical fiber low repetition frequency parametric oscillator used for stimulated Raman scattering. Pump light output by a pump source passes through an isolator and a first optical coupler to enter a parametric oscillation cavity; combined waves of the first and second optical couplers enter a gain optical fiber and a parametric conversion medium; the gain optical fiber amplifies the pump light power of the parametric oscillation cavity entering from the first optical coupler; the output light of the gain optical fiber enters the parametric conversion medium which is in direct fusion with the gain optical fiber; a four-wave mixing effect occurs in the parametric conversion medium; and one part of the output light of the gain optical fiber is directly output,and the other part of the output light of the gain optical fiber returns to the first optical coupler as feedback light, so that the parametric oscillation cavity can be formed. The optical couplersare placed at front of the gain optical fiber so that the gain optical fiber and the parametric conversion medium can be in direct fusion, and therefore, that optical coupler tail fiber generates harmful non-linear effects under low repetition frequency and high peak power pump light can be avoided, parametric conversion efficiency can be enhanced, frequency spectrum noise can be reduced, and theall optical fiber low repetition frequency parametric oscillator can be realized.

Description

technical field [0001] The invention relates to a laser technology, in particular to an all-fiber low repetition frequency parametric oscillator for stimulated Raman scattering. Background technique [0002] Optical microscopy is an important visual detection tool in the field of life sciences, which has greatly expanded people's understanding of life sciences. Fluorescence microscopy using staining and labeling provides us with a more direct detection method, but fluorescent labeling may cause changes in the physiological characteristics of biological tissues or cells, and even kill the observed sample cells. Therefore, label-free detection technology has become a life A development direction of scientific testing. The development of coherent anti-Stokes Raman scattering (CARS) imaging technology has brought a new solution to biological imaging. This solution can obtain anti-Stokes based on the vibration or rotational energy level of material molecules without labeling. M...

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Problems solved by technology

[0005] The invention aims at the problems existing in the traditional coherent anti-Stokes Raman scattering (CARS) imaging light source, and proposes an all-fiber low repetition rate parametric oscillator for stimulated Raman scattering, which changes the The optical path layout in which the optical coupler is placed between the gain fiber and the parametric conversion medium, the optical coupler is placed before the gain fiber, so that the gain fiber and the parametric conversion medium can be directly fused, avoiding the need for low repetition frequency and high peak power pump light Under the action, the pigtail fiber of the optical coupler produces harmful nonlinear effects, improves the parameter conversion efficiency, reduces the spectral noise, and then realizes the parametric oscillator with low repetition frequency of the whole fiber, and the obtained light source is suitable for detecting the sheath, etc. Requirements for CARS signaling in dense cells

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