A Total Reflection Femtosecond Stimulated Raman Spectrometer

Abstract

The invention discloses a total reflection femtosecond stimulated Raman spectrometer, comprising a light source module, two beam splitter mirrors, two sets of optical delay lines, a reflection mirror group, a concave mirror, an aperture, a spectral filtering module and a first spectrometer . The femtosecond pulse laser generated by the light source module is divided into two laser beams after passing through the first beam splitter, and the reflected beam is used as excitation pump light and passes through the first to third mirrors, the first optical delay line, the fourth to The seventh mirror and the concave mirror are then focused onto the sample; the transmitted beam is reflected by the second beam splitter, used as probe light, and then focused on the sample after passing through the eighth to eleventh mirrors and the seventh concave mirror , the transmitted light is collected by the first spectrometer after passing through the diaphragm; the second laser beam passes through the second beam splitter and is transmitted as Raman pump light, which passes through the twelfth to fourteenth mirrors, spectral filter module, The second optical delay line, the fifteenth, sixteenth, seventh mirrors, and the concave mirror are then focused onto the sample.

Description

technical field [0001] The invention relates to the technical field of spectrometers, in particular to a total reflection femtosecond stimulated Raman spectrometer. Background technique [0002] Femtosecond Stimulated Raman Spectroscopy (FSRS) instrument is an important scientific instrument widely used in the fields of physics, chemistry, biology, materials and medicine. The specific research directions involved include chemical reaction kinetics, excited state relaxation, lattice relaxation kinetics, charge transfer and carrier recombination, etc. Femtosecond stimulated Raman spectroscopy is very similar to conventional transient absorption spectroscopy in the experimental optical path, but with the advantages of time-resolved vibrational spectroscopy. Stimulated Raman spectroscopy can not only obtain relevant information collected by traditional transient absorption spectrometers, but also provide additional dynamics of material microscopic lattice and molecular structur...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a total reflection femtosecond stimulated Raman spectrometer to solve the influence of the transmission focusing of the existing femtosecond stimulated Raman spectrometer on the ultrashort pulse width. For ultra-fast several-cycle laser light source to achieve sub-10fs ultra-high time resolution

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