Ultra-high time resolution ultra-long time window transient absorption spectrometer

Abstract

The invention discloses a transient absorption spectrometer. The transient absorption spectrometer comprises a light source module, a beam splitter, two sets of optical delay lines, an optical lens set and a spectrometer, wherein one set of the optical delay lines is a short-stroke optical delay line and is used for realizing sub-10-femtosecond optical delay time resolution, and the other is a long-stroke optical delay line for achieving optical delay times greater than 16 nanoseconds. A laser beam emitted by the light source module is divided by the beam splitter into pump light and detectionlight, after time delay of the detection light by the two sets of optical delay lines connected in series, the detection light after time delay and the pump light are focused through the optical lensset at a to-be-tested sample, and the detection light transmitted through the to-be-tested sample is subjected to signal acquisition by the spectrometer. The transient absorption spectrometer is advantaged in that advantages of sub-10-femtosecond ultra-high time delay resolution and the nanosecond ultra-long time delay window are both realized, and limitations of the optical delay lines to systemtime resolution capability and the measurement time window in a traditional commercial transient absorption spectrometer are eliminated.

Description

technical field [0001] The invention relates to the technical field of spectrometers, in particular to a transient absorption spectrometer with ultra-high time resolution and ultra-long time window. Background technique [0002] Transient absorption spectrometer is an important scientific instrument, which is 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. The schematic diagram of the basic structure of the existing commercial transient absorption spectrometer is as follows: figure 1 As shown, a beam of strong pump light is incident on the sample to excite the sample from the ground state to the excited state, while another beam of weak probe light (usually continuous white light) passes through the motorized translation stage to cause optical delay Afterwards, ...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a transient absorption spectrometer with ultra-high time resolution and ultra-long time window to solve the problem that the optical delay line in the existing transient absorption spectrometer limits the system time resolution capability and measurement time window

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