Collinear femto-second laser polarized pump detecting system

Abstract

The invention relates to a collinear femto-second laser polarized pump detecting system, comprising that a pulse laser is output by a polarized output pulse laser; the laser is rotated in the polarization direction by a wave plate; a light-splitting device divides the laser beam into two beams vertical to each other in the polarization direction; a reflector receives and reflects the laser beams; an acoustooptic modulator modulates the laser beams; an aperture transmits the modulated laser beams; an acoustooptic modulator driver transmits modulation signals for the acoustooptic modulator; an electrically controlled travelling carriage moves forward and backward; an analyzer transmits the laser beams which are vertical to each other in the polarization direction; a photodetector receives the laser transmitted by the analyzer; a magnet fixes an adjusting rack so as to fix a sample; a focusing lens irradiates the laser on the surface of the sample; and an electrically controlled revolving stage fixes the wave plate. The invention combines the two beams of light vertical to each other in the polarization direction by polarized coupling; therefore, the system can ensure spatial coherence of the two beams of light on the sample, thereby avoiding the problem of adjusting direction of light beam; thus, the operation is simpler.

Description

technical field [0001] The invention belongs to the field of laser technology, relates to an ultra-short laser pulse pumping detection technology, in particular to a collinear femtosecond laser polarization pumping detection system. Background technique [0002] Femtosecond laser pump detection system is the continuous development and maturity of ultra-short laser pulse technology, which enables people to explore the process that occurs in a very short time, and has important application value in the fields of physics, chemistry, biology, and medicine. In the study of ultrafast thermodynamic processes, it is often necessary to use ultrashort pulse laser pump-probe technology. In the traditional ultrashort laser pulse pump-detection system, one laser beam is generally used for pumping and another laser beam with different wavelengths is used for detection. Therefore, nonlinear crystals need to be added to realize laser wavelength conversion; or a horizontal (or vertical beam)...

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Problems solved by technology

[0003] In order to solve the problems of the prior art, the purpose of the present invention is to solve the shortcomings of the spatial incoherence of the pump light and the probe light caused by different sample thicknesses, making t

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