Time resolution Faraday rotation technology-improved experiment device and method

A Faraday rotation and technical improvement technology, which is applied in the field of time-resolved Faraday rotation technology to improve experimental devices, can solve the problems of inability to precisely control the degree of circular polarization, impossible to precisely control the angle, and inability to ensure the same degree of circular polarization, etc. Cost, saving laboratory space, and improving accuracy

Inactive Publication Date: 2015-05-20
SHANDONG NORMAL UNIV
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Problems solved by technology

It is impossible to accurately control the angle by manual operation, which will cause large errors, so that the degree of circular polarization cannot be precisely controlled, and the degree of circular polarization cannot be guaranteed to be the same during the same direction and the reverse measurement process

Method used

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  • Time resolution Faraday rotation technology-improved experiment device and method
  • Time resolution Faraday rotation technology-improved experiment device and method
  • Time resolution Faraday rotation technology-improved experiment device and method

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Embodiment Construction

[0034] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] The time-resolved Faraday rotation technique improves the experimental setup such as figure 1As shown, including: several mirrors, beam splitters, optical delay lines, choppers and controllers, 2 lock-in amplifiers, 2 detectors, 1 / 4 wave plate, 1 / 2 wave plate, Wallas Dayton prism and lens; the laser pulse is divided into two beams after passing through the mirror M1, the mirror M2 and the beam splitter in turn, and one of the stronger pulses is used as the pumping light, and then passes through the chopper, the optical delay line, and the mirror M3 , mirror M4, 1 / 4 wave plate and lens and then focus on the sample, the pumping light passing through the sample is blocked or absorbed by the blocking object; the other weaker beam is used as the probe light, which passes through the mirror M5, mirror ...

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Abstract

The invention discloses a time resolution Faraday rotation technology-improved experiment device and method. The method comprises the following steps: a laser pulse sequentially passes through a reflecting mirror M1, a reflecting mirror M2 and a beam splitter and then is divided into two beams, one sequentially passes through a chopper, an optical delay line, a reflecting mirror M3, a reflecting mirror M4, a one quarter wave plate and a lens and then is focused on a sample, the other beam sequentially passes through a reflecting mirror M5, a reflecting mirror M6, a reflecting mirror M7 and a lens and is focused on the same point of the sample, and detection light penetrating through the sample sequentially passes through a reflecting mirror M8, a half wave plate and a wollaston prism and then is processed by a computer after respectively passing through a first detector and a first phase-locked amplifier as well as a second detector and a second phase-locked amplifier. The time resolution Faraday rotation technology-improved experiment device has the beneficial effects that experiment equipment and laboratory space can be saved, and the experiment cost can be lowered. In addition, acquired data can be free of noise due to instability of laser, and thus the signal-to-noise ratio can be greatly improved.

Description

technical field [0001] The invention relates to the technical field of application of femtosecond laser technology in ultrafast dynamics, in particular to an experimental device and method for improving time-resolved Faraday rotation technology. Background technique [0002] In recent years, the integration of traditional electronic devices based on nuclear power has been greatly improved, the size has been continuously reduced, and the quantum effect has become more and more obvious, which seriously restricts the development of traditional electronic devices. Substituting charge characteristics to prepare a new generation of electronic devices, the study of electron spin characteristics has become a frontier hotspot. The spin relaxation lifetime and the Faraday rotation angle are related to the performance of spin devices, and are important parameters that must be considered in the design and fabrication of spin devices. [0003] The development of ultra-short and ultra-in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01J3/28
Inventor 马红梁康强赵丽娜刘玫高垣梅
Owner SHANDONG NORMAL UNIV
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