Totally-reflective femtosecond stimulated Raman spectrometer

Abstract

The invention discloses a totally-reflective femtosecond stimulated Raman spectrometer. The Raman spectrometer comprises a light source module, two beam splitters, two optical delay lines, a reflectorset, a concave mirror, a diaphragm, a spectral filtering module and a first spectrometer, wherein a femtosecond pulse laser generated by the light source module is split into two laser beams after passing through the first beam splitter, the reflected beam serves as actinic pump light and focuses on a sample after passing through a first reflector, a second reflector, a third reflector, the firstoptical delay line, a fourth reflector, a fifth reflector, a sixth reflector, a seventh reflector and the concave mirror sequentially; the transmitted beam is reflected after passing through the second beam splitter, serves as detection light and focuses on the sample after passing through an eighth reflector, a ninth reflector, a tenth reflector, an eleventh reflector, the seventh reflector andthe concave mirror sequentially, and the transmitted light is collected by the first spectrometer after passing through the diaphragm; and the second laser beam is transmitted after passing through the second beam splitter to serve as Raman pump light and focuses on the sample after passing through a twelfth reflector, a thirteenth reflector, a fourteenth reflector, the spectral filtering module,the second optical delay line, a fifteenth reflector, a sixteenth reflector, the seventh reflector and the concave mirror sequentially.

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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