高譜分辨率寬帶相干反斯托克斯拉曼散射光譜探測
[Abstract]:The coherent anti-Stokes Raman scattering (Coherent anti-Stokes Raman Scattering,CARS) technique is based on the inherent vibration and rotational characteristics of matter molecules, so it can be used without labeling. The nonlinear signal is produced by the interaction of light and matter. CARS is a third order nonlinear effect, so it has the characteristics of high sensitivity, high spatial resolution and three-dimensional tomography, so it is widely used in the spectral detection and microscopic imaging of living cells. It is possible to observe intact samples and living cells in a natural microenvironment. All along, CARS is based on the anti-Stokes signal generated by a specific chemical bond within a molecule to characterize a particular molecule. However, it is far from enough to distinguish a wide variety of biological molecules within cells by a single chemical bond. Therefore, in order to identify different molecules more accurately and quickly, complete molecular CARS spectra should be obtained simultaneously. In this paper, a high spectral resolution wideband CARS spectral detection method is proposed by combining the supercontinuum light source with the ultra-narrow band pass filter. The ultrashort laser pulse is divided into two channels, and the supercontinuum spectrum generated by the photonic crystal fiber is pumped one way to make the Stokes light. The other way through the narrow band filter, the laser pulse with a spectral width of about 0.7 nm, pulse width up to picosecond is obtained, and the laser pulse is simultaneously used as the pump light and the detection light. The two laser pulses are combined with the beam and then focused on the sample by the microscope objective lens. Thus, broadband CARS spectra with high spectral resolution are generated. The main innovation points of this paper are as follows: 1. A broadband CARS spectral detection method with high spectral resolution is proposed. Theoretical analysis and numerical simulation are carried out to prove the feasibility of the method. 2. A set of high spectral resolution wideband CARS spectral detection system was set up. Six CARS characteristic peaks of benzonitrile samples in the range of 500-3500 cm-1 were obtained at one time. The main contents of this thesis are as follows: 1. Compared with traditional single frequency CARS and wideband CARS, a high spectral resolution wideband CARS method is proposed. 2. The nonlinear Schrodinger equation is solved numerically by using the symmetric discrete step Fourier method. The evolution of ultrashort laser pulses in the time domain and the spectrum domain is simulated when they propagate in photonic crystal fibers. It provides a theoretical basis for the generation of supercontinuum spectral light source for broadband CARS spectral detection with high spectral resolution. Based on the high spectral resolution wideband CARS method, the spectral simulation of multiple molecular resonance bonds in polystyrene beads and benzonitrile was carried out, and the high spectral resolution broadband CARS spectra of polystyrene beads and benzonitrile were obtained. 4. A high spectral resolution wideband CARS spectral detection system was set up to detect the molecular vibration of benzonitrile samples simultaneously in 500-3500 cm-1.
【學位授予單位】:深圳大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:O433
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