On-chip optical detection of laser cooled atoms

Area of Science:

• Atomic, Molecular, and Optical Physics
• Nanotechnology and Surface Science
• Quantum Optics

Background:

• Atom chips enable precise manipulation and trapping of neutral atoms.
• Optical detection methods are crucial for probing atomic properties and dynamics.
• Surface magneto-optical traps (SMOTs) confine laser-cooled atoms near a surface.

Purpose of the Study:

• To implement and demonstrate an optical fiber-based system for detecting atoms on an atom-chip.
• To optically probe laser-cooled atoms confined in a surface magneto-optical trap.
• To validate the system's utility by measuring atomic spectral properties.

Main Methods:

• Utilized an optical fiber pair as an emitter-detector setup.
• Bonded the fiber system directly to the reflective atom-chip surface.
• Employed laser cooling techniques to trap neutral atoms.
• Measured the spectral linewidth of the cesium D2 transition.

Main Results:

• Successfully implemented optical detection of trapped atoms using the fiber system.
• Demonstrated the ability to probe laser-cooled atoms in a surface magneto-optical trap.
• Measured the linewidth of the cesium D2 line as a function of laser intensity.

Conclusions:

• The optical fiber-based system provides an effective method for atom detection on atom chips.
• This technique is suitable for probing trapped atoms in surface magneto-optical traps.
• The demonstrated spectral measurements highlight the system's capability for atomic characterization.