Non-coaxial transmission type ultrafast transient absorption system with temperature field regulation and control function and measurement method

Abstract

The invention relates to a non-coaxial transmission type transient absorption measurement system and method with a temperature field regulation and control function, and belongs to the technical fieldof optical detection. According to the invention, the FPGA technology is utilized to synchronize the processes of laser pulse emission of the femtosecond laser, laser pulse frequency modulation of the chopper, acquisition of the fiber optic spectrometer and the like, and the method can effectively improve the real-time reliability of the test result of the measurement system and the signal-to-noise ratio of the system; meanwhile, a transient absorption device is integrated with a confocal microscopic imaging and temperature field regulating device, so transient absorption spectrum informationof a microscopic material at different temperatures can be tested, and photo-excited carrier relaxation kinetics of the material at different temperatures can be obtained. The system adopts automaticmeasurement and has the characteristics of rapidness, high efficiency and sensitivity.

Description

Technical field[0001]The invention belongs to the technical field of optical detection, and specifically refers to a non-coaxial transmission type ultrafast transient absorption system and measurement method with a temperature field control function.Background technique[0002]The transient absorption spectroscopy device is an important scientific instrument for studying the information of the excited state dynamics of materials. Compared with the transient fluorescence spectroscopy device, the transient absorption spectroscopy technology has the advantage of: even if the sample does not emit light, the excited state dynamics can also be The research has made it an irreplaceable position in studying the dynamics of non-radiative recombination processes. The system uses pump light as excitation, and a large number of photogenerated carriers are generated in the sample. The process of band filling, band gap reforming, defect state filling, and intersystem crossing affects the carrier di...

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Problems solved by technology

[0003] At present, the measurement technology of transient absorption spectrum is very important and develops rapidly, but there are the following problems: (1) For the samples to be tested, only some samples with relatively strong absorption signals can be selected, and for samples with weak signals, due to the signal-to-noise ratio of the system Poor, cannot accurately detect its signal

(2) The transient absorption spectrum technology based on the ultrafast fiber optic spectrometer as the spectrum acquisition device has not yet dealt with the background noise well, which seriously affects the authenticity of the signal

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