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Miniaturized optical rotation SERF magnetometer integrated with VCSEL laser

A laser and magnetometer technology, applied in the field of miniaturized polarimetric SERF magnetometer, can solve the problems of high implementation difficulty and complicated process.

Active Publication Date: 2021-06-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of this method is cumbersome and complicated, and it is difficult to implement. At present, only Quspin company has mastered this technology (US10243325B2)

Method used

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  • Miniaturized optical rotation SERF magnetometer integrated with VCSEL laser
  • Miniaturized optical rotation SERF magnetometer integrated with VCSEL laser
  • Miniaturized optical rotation SERF magnetometer integrated with VCSEL laser

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Embodiment 1

[0034] Such as figure 2 A miniaturized optical rotation SERF magnetometer integrated with VCSEL laser is shown, including a light source part, an optical path part, an atomic gas chamber part, a magnetic field part and a signal detection part; wherein, the light source part is VCSEL laser 1, and the laser frequency is tuned to the optical rotation angle It is close to the maximum wavelength band; the optical path part adjusts the light emitted by the VCSEL laser 1 into elliptically polarized light; the signal detection part uses optical rotation detection to measure the magnitude of the external magnetic field.

[0035] The light source part includes a VCSEL laser 1 and a collimator lens 2; where the laser is driven to emit light through a temperature control system and a precise current source, the output current of the current source is adjusted, and the wavelength of the VCSEL laser 1 is controlled to be detuned from the rubidium atom D1 line by about 20-30G , the light em...

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Abstract

The invention discloses a miniaturized optical rotation spin exchange relaxation free (SERF) magnetometer integrated with a VCSEL laser. In order to overcome the problems encountered in practical application of a miniaturized SERF magnetometer adopting optical fiber transmission, the invention adopts a VCSEL laser as a light source to replace optical fiber transmission, and realizes the miniaturized SERF magnetometer integrated with the VCSEL laser. Meanwhile, an elliptically polarized light rotation detection mode is utilized, the advantage that a single light configuration light path is simple is guaranteed, meanwhile, the influence of frequency jitter of the VCSEL laser on the sensitivity of the magnetometer is greatly reduced, and the high sensitivity of 55fT / Hz1 / 2 is achieved. The SERF magnetometer provided by the invention can be used for measuring the magnetic field of the heart of a human body.

Description

technical field [0001] The invention belongs to the technical field of atomic magnetometers, and in particular relates to a miniaturized optical rotation SERF magnetometer integrated with a VCSEL laser, which can be used to measure the weak magnetic field of the heart. Background technique [0002] The study of the weak magnetic field of the heart began in 1963, when Baule et al. used a coil magnetometer to detect the magnetic signal of the heart for the first time. With the development of Superconducting Quantum Interference Device (SQUID), Cohen et al. used SQUID magnetometer to detect cardiomagnetic signal in 1970. Subsequently, the study of the weak magnetic field of the heart attracted widespread attention, and the magnetocardiogram technology based on the SQUID magnetometer was gradually developed and applied in clinical diagnosis and medical research. Magnetocardiography can be used for 3D localization of arrhythmia, life-threatening arrhythmia risk assessment, non-i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01V3/40
CPCG01V3/40
Inventor 林强黄宇翔张桂迎曾红健李昊刘国磊
Owner ZHEJIANG UNIV OF TECH