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Double-Layer Optical-Trap Arrays for Trapping Cold Atoms or Molecules

沐仁旺 Mu Renwang, 纪宪明 Ji Xianming, 印建平 Yin Jianping

Acta Optica SinicaJan 1, 20090 citations

A Novel Controllable Four-Well Optical Trap for Cold Atoms or Molecules and Its Two-Dimensional Optical Lattices

陆俊发 Lu Junfa, 纪宪明 Ji Xianming, 周琦 Zhou Qi +1 more

Acta Optica SinicaJan 1, 20080 citations

A Novel Controllable Six-Well Optical Trap for Cold Atoms or Molecules and Optical lattice

陆俊发 Lu Junfa, 陆荷琴 Lu Heqin, 周琦 Zhou Qi +1 more

Acta Optica SinicaJan 1, 20080 citations

Controllable Eight-Well Optical Trap and the Two-Dimensional Optical Lattices for Cold Atoms or Molecules

陆俊发 Lu Junfa, 纪宪明 Ji Xianming, 印建平 Yin Jianping

Chinese Journal of LasersJan 1, 20080 citations

A novel array of surface hollow optical micro-traps

Ji Xian-Ming, Renwang Mu, Yin Jianping +1 more

In this paper, we propose a new scheme to form an array of surface hollow optical micro-traps for cold atoms (or molecules) by using a phase grating with four phase steps and an array of microlens, study the intensity distribution of 2D array of surface hollow optical micro-traps, and calculate the corresponding optical potential for cold 85Rb atoms, and discuss some potential applications of our hollow micro-trap array in atom and molecule optics. Our study shows that when our grating-lens system is illuminated by YAG laser with a power of 1W, a 2D array of surface hollow optical traps with 104 micro-wells will be generated in an area of 1cm2. Each optical trap has some novel characteristics, such as smaller trapping volume, higher effective intensity and its intensity gradient. The corresponding optical potential for trapped 85Rb atoms can reach 190μK, which is high enough to trap cold atoms or cold molecules, and can be used to realize an all-optical atomic and molecular Bose-Einstein condensations, even to prepare novel optical lattices, and so on.In this paper, we propose a new scheme to form an array of surface hollow optical micro-traps for cold atoms (or molecules) by using a phase grating with four phase steps and an array of microlens, study the intensity distribution of 2D array of surface hollow optical micro-traps, and calculate the corresponding optical potential for cold 85Rb atoms, and discuss some potential applications of our hollow micro-trap array in atom and molecule optics. Our study shows that when our grating-lens system is illuminated by YAG laser with a power of 1W, a 2D array of surface hollow optical traps with 104 micro-wells will be generated in an area of 1cm2. Each optical trap has some novel characteristics, such as smaller trapping volume, higher effective intensity and its intensity gradient. The corresponding optical potential for trapped 85Rb atoms can reach 190μK, which is high enough to trap cold atoms or cold molecules, and can be used to realize an all-optical atomic and molecular Bose-Einstein condensations, even to prepare novel optical lattices, and so on.

Acta Physica SinicaJan 1, 20053 citations

Improved far-field optical trap for cold atoms (molecules) with phase-modulated circular aperture diffraction

Liya Chen, Jianping Yin

We propose a scheme to trap cold atoms (or molecules) by using an improved red- or blue-detuned far-field optical trap, which is formed by an optical system composed of a binary phase plate and a circular aperture illuminated by a plane light wave. We calculate the relative intensity distribution of the far-field trap and study its dependence on the phase $\ensuremath{\varphi}$ of the binary phase plate. Our study shows that the binary phase plate can be used to improve some geometric and optical parameters of the far-field optical trap, and realize the evolution of the far-field optical trap from a red-detuned trap to a blue-detuned one. In particular, when the phase $\ensuremath{\varphi}$ of the binary phase plate is changed from 0 to $\ensuremath{-}\ensuremath{\pi}$, the maximum intensity of the far-field trap and its well depth will be enhanced by $\ensuremath{\sim}4$ times, and the corresponding trapping volume will be increased by $\ensuremath{\sim}8$ times, with respect to a trapping beam obtained from the diffraction by a circular aperture.We propose a scheme to trap cold atoms (or molecules) by using an improved red- or blue-detuned far-field optical trap, which is formed by an optical system composed of a binary phase plate and a circular aperture illuminated by a plane light wave. We calculate the relative intensity distribution of the far-field trap and study its dependence on the phase $\ensuremath{\varphi}$ of the binary phase plate. Our study shows that the binary phase plate can be used to improve some geometric and optical parameters of the far-field optical trap, and realize the evolution of the far-field optical trap from a red-detuned trap to a blue-detuned one. In particular, when the phase $\ensuremath{\varphi}$ of the binary phase plate is changed from 0 to $\ensuremath{-}\ensuremath{\pi}$, the maximum intensity of the far-field trap and its well depth will be enhanced by $\ensuremath{\sim}4$ times, and the corresponding trapping volume will be increased by $\ensuremath{\sim}8$ times, with respect to a trapping beam obtained from the diffraction by a circular aperture.

Physical Review ADec 18, 20097 citations

An Improved Hollow Optical Trap for Cold Atoms (Molecules) with Phase Modulation

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