Quantum weak measurement-based complex magneto-optical angle measurement system and method
A measurement system and weak measurement technology, applied in the measurement of magnetic variables, measurement devices, the size/direction of the magnetic field, etc., can solve the problem of inability to separate the magneto-optical rotation angle and magneto-optical ellipticity while measuring with high accuracy and limiting the magneto-optical effect Measurement accuracy and other issues, to achieve the effect of good application prospects, high sensitivity, wide application prospects
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Embodiment 1
[0048] The complex magneto-optical angle measurement device based on the quantum weak measurement provided by the present embodiment is applicable to the measurement of the complex magneto-optic angle in the magneto-optical Kerr effect (reflection method), such as figure 1 and figure 2 As shown, it includes a light emitting device, a polarization state generator 3 , an electromagnetic field generating device 8 , a phase adjusting device 4 , a time delay device 5 , a polarization state detector 6 and a photodetector 7 .
[0049] The light emitting device is used to provide light beams, and includes a light source generator 1 and a light intensity attenuator 2 arranged in sequence. The light source generator 1 is mainly used to provide a polarized light source. In this embodiment, the light source generator 1 can emit a collimated light beam with a center wavelength of 633 nm and a spectral width of 10 nm. The light intensity attenuator 2 is used to attenuate the light power e...
Embodiment 2
[0058] The complex magneto-optical angle measuring device based on the quantum weak measurement provided by the present embodiment is applicable to the measurement of the complex magneto-optic angle in the magneto-optical Faraday effect (transmission method), such as image 3 and Figure 4 As shown, it includes a light emitting device, a polarization state generator 3 , an electromagnetic field generating device 8 , a phase adjusting device 4 , a time delay device 5 , a polarization state detector 6 and a photodetector 7 .
[0059] The light emitting device is used to provide light beams, and includes a light source generator 1 and a light intensity attenuator 2 arranged in sequence. The light source generator 1 is mainly used to provide a polarized light source. In this embodiment, the light source generator 1 can emit a collimated light beam with a center wavelength of 633 nm and a spectral width of 10 nm. The light intensity attenuator 2 is used to attenuate the light powe...
Embodiment 3
[0067] The complex magneto-optical angle measurement method based on quantum weak measurement provided in this embodiment is measured based on the measurement device provided in Embodiment 1, and specifically includes the following steps:
[0068] Step 1. Initial state setting
[0069] Place the sample 9 to be tested in the working chamber of the electromagnetic field generating device according to the set direction, start the light emitting device under the condition that the magnetic field is zero, and the light emitting device emits a collimated beam with a center wavelength of 633nm and a spectral width of 10nm. The plane polarized light that becomes horizontally polarized | H> by the polarization state generator 3 is incident on the surface of the sample 9 to be tested, and the plane polarized light reflected by the sample surface is converted into elliptical polarized light, and the reflected light passes through the time delay device 5, and then The outgoing light is pr...
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