Diamond NV color center prepared through laser direct writing assisted by spatial light modulation technology, preparation method and application of diamond NV color center

A technology of spatial light modulation and auxiliary laser, applied in diamond, laser welding equipment, manufacturing tools, etc., can solve the problems of destroying focus energy density, complicated preparation process, limited positioning accuracy, etc., achieving high positioning accuracy and simple preparation process. , the effect of easy operation

Pending Publication Date: 2021-11-12
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high refractive index of diamond materials, serious aberrations will occur when the laser is incident inside the diamond, destroying the focal energy density.
It can be seen that the existing methods for preparing diamond internal NV color centers face disadvantages such as high cost, complicated operation, limited positioning accuracy, and complicated preparation process.

Method used

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  • Diamond NV color center prepared through laser direct writing assisted by spatial light modulation technology, preparation method and application of diamond NV color center
  • Diamond NV color center prepared through laser direct writing assisted by spatial light modulation technology, preparation method and application of diamond NV color center
  • Diamond NV color center prepared through laser direct writing assisted by spatial light modulation technology, preparation method and application of diamond NV color center

Examples

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Effect test

Embodiment 1

[0040] Preparation of diamond NV color centers by laser direct writing assisted by spatial light modulation technology.

[0041] After correcting the aberration by using the frequency-doubled femtosecond laser reflected by the spatial light modulator, the diamond sample after laser direct writing is placed in a high-temperature annealing furnace for annealing according to a certain temperature gradient and time length, and then the sample is placed in the prepared The mixed acid solution is heated in a hydrothermal reaction oven, and then the diamond sample is taken out and cleaned thoroughly, and finally a single NV color center inside the diamond is obtained.

[0042] A method for preparing diamond NV color centers assisted by laser direct writing with spatial light modulation technology, the specific steps are as follows:

[0043] (1) Preparation of diamond samples: The purchased double-sided polished commercial CVD diamond has a side length of 2 mm, a thickness of 500 μm, ...

Embodiment 2

[0053] The embodiment of the present invention also provides an application of diamond NV color centers prepared by laser direct writing assisted by spatial light modulation technology in the preparation of quantum optical devices.

[0054] The NV color center prepared in Example 1 shows the anti-bunching phenomenon through the photon correlation test, which proves that it is a single NV color center, which only emits one photon in one excitation-deexcitation process when excited by the excitation light. Therefore, it can be used as a single photon source. An ideal single photon source often needs to meet several requirements of stability at room temperature, long coherence time, and narrow optical linewidth close to the excited state lifetime. The ground state electrons of the NV color center are excited to transition and radiate fluorescence under the irradiation of excitation light, and the "excitation-emission" process occurs many times, and the generated photons will main...

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Abstract

The invention discloses a diamond NV color center prepared through laser direct writing assisted by a spatial light modulation technology, a preparation method and an application of the diamond NV color center, and belongs to the technical field of femtosecond laser machining. Femtosecond laser modulated through the spatial light modulation technology is used for inducing local modification in diamond to generate vacancies, then a sample is annealed, and finally a single NV color center in the diamond is obtained. The main principle is that the phase of a laser focus is pre-compensated, the aberration of the laser focus caused by the loss of refractive index is corrected by using an algorithm, the morphology of the laser focus stretched due to the aberration is recovered, a light spot is prevented from being stretched, and the focus energy density of the laser is still kept concentrated in the diamond at a large depth; after the sample is annealed, the diamond internal single NV color center with large depth, high stability, high yield and narrow optical line width is obtained.

Description

technical field [0001] The invention belongs to the technical field of femtosecond laser processing, and in particular relates to the preparation of a diamond NV color center with high yield, high stability and narrow optical linewidth at a large depth in a diamond sample by using a femtosecond laser corrected by a spatial light modulation technology, and a preparation method and its application. Background technique [0002] NV color center, also known as nitrogen-vacancy color center, is a common point defect formed by the combination of nitrogen atoms and carbon vacancies in diamond. The NV color center is stable at room temperature and has a high fluorescence quantum yield. It is an excellent single photon source and has been widely used in frontier fields such as quantum computing, quantum sensing, and quantum information. In recent years, the preparation methods of NV color centers have also received more and more attention. The existing NV color center preparation m...

Claims

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Application Information

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IPC IPC(8): C01B32/28B23K26/70
CPCC01B32/28B23K26/702
Inventor 孙洪波高斯田振男陈岐岱
Owner JILIN UNIV
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