Laser cooling and manipulation of atoms

Classification:

【Summary】For more than 30 years, the development of laser cooling and manipulation of atoms has deepened and expanded physics' knowledge and understanding of the interaction between light and atoms, leading to the theoretical and experimental realization and development of Bose-Einstein condensation and a range of precise physical measurements.

Atomic and molecular physics is an important branch of modern physics, which not only gave birth to quantum mechanics, deepened people's understanding of the microcosmic world, but also directly promoted the development of science and technology in the world from the 20th century to the present, and promoted the progress of human society. The laser cooling and trapping of atoms is characterized by reducing the speed of atomic thermal motion while keeping the atoms in a free state with little interaction. This technology has been important in the research fields of precision measurement and atomic spectroscopy, opening a new world of atomic manipulation. [1]

The basic principle of laser manipulation of atoms mainly has the following aspects:

● Scattering force and occasional force

● Zeeman slow down

● Optical damping and magneto-optical trap

● Polarization gradient cooling and subrecoil cooling

● Velocity selective Coherent population confinement (VSCPT) cooling method

● The excited Raman transition enables the selection of atomic speed, and the cooling temperature below the photon recoil limit is obtained (Raman cooling).

The main applications of laser cooling atoms are:

● Bose-Einstein condensation

● Atomic interferometer

● Atomic clock

● Quantum simulation

● Experimental verification of basic physical theories

Laser cooling and manipulation of atoms has become an important branch of cutting-edge research in physics, and new theories and technologies continue to emerge, which will deepen people's understanding of multi-body physics, and promote the development of precision measurement, quantum information, quantum phase transitions and other applications.

Below is a typical cold atom laboratory photo, involving optical, mechanical, electronic and other aspects of the instrument equipment.

Wuhan Hao Seng Optoelectronics Technology Co., Ltd. can provide systematic support for laser cooling and manipulation of atomic experiments, including atomic furnace (atomic molecular beam technology), vacuum chamber, laser light source, laser frequency stabilization, laser modulation, optics, magnetic field control, fluorescence detection and signal processing and other comprehensive instruments and technical support.

[1] Zhuang Wei, Li Tianchu. Laser cooling and manipulation of atoms: Principle and application [J]. Science and Technology Review, 2018, 36(5):11. (in Chinese)

Key words:

激光冷却,精密测量

None