Tunable pumping-detecting system based on super-continuum spectrum light source

Abstract

The invention discloses a tunable pumping-detecting system based on a super-continuum spectrum light source. The tunable pumping-detecting system comprises a femtosecond fiber laser and laser beam splitting device, a super-continuum spectrum light source and wavelength filtering device, a sample and detection receiving device, a time delay device and a lock-in amplification and data acquisition device, wherein the femtosecond fiber laser and laser beam splitting device splits the laser into two beams, one beam of light is used as pump light, the other beam of light enters a high nonlinear optical fiber to generate a nonlinear effect to generate a super-continuum spectrum, the wavelength is tunable from a visible light band to a near infrared band, and the super-continuum spectrum is combined with a wavelength and bandwidth tunable filter to obtain detection light with tunable wavelength; the pump light and the detection light pass through the time delay device and then enter the same position of the sample; the sample generates nonlinear photoelectric response under the irradiation of the pump light, and modulates the detection light passing through the sample; the detection lightis filtered and then is received by the data receiving device.

Description

technical field [0001] The invention relates to a pump-detection system, in particular to an adjustable pump-detection system based on a supercontinuum light source, and belongs to the field of ultrafast spectrum detection. Background technique [0002] Ultrafast laser provides people with up to 10 -15 Optical probes with second time resolution, resulting in ultrafast laser pump-probe technology for studying the energy levels of excited states of matter and ultrafast dynamics. In the pump-probe technique, the output of an ultrafast laser is split into two beams by a beam splitter. One beam is pumping light, and the other beam passes through a wavelength conversion device to obtain probe light with tunable wavelength. The repetition frequency of the pumping and probing pulsed lasers is the same. The time-delay platform is used between the pumping and probing lasers, allowing the two lasers to travel different distances in space. Therefore, the two beams of pulses can reac...

AI Technical Summary

Problems solved by technology

High-power Ti:Sapphire lasers have high requirements on the operating environment and cannot operate stably in ordinary experimental environments

In addition, Ti:Sapphire lasers and parametric amplifiers are relatively large in size, complex in device, and high in cost, further limiting their use in pump-probe applications.

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