Resonator-enhanced optical dipole trap for fermionic lithium atoms.

Area of Science:

• Atomic, Molecular, and Optical Physics
• Quantum Gases
• Laser Physics

Background:

• Optical dipole traps are crucial for trapping ultracold atoms.
• Achieving long storage times and deep potentials is essential for studying quantum phenomena.
• Laser noise significantly impacts the stability and duration of atom trapping.

Purpose of the Study:

• To demonstrate a novel optical dipole trap with enhanced power density.
• To investigate atomic interactions in ultracold fermionic lithium gas.
• To analyze the effect of laser noise on trap storage times.

Main Methods:

• Utilizing a resonator to enhance the power density of a Nd:YAG laser beam.
• Trapping fermionic lithium atoms and studying their interactions.
• Investigating the dependence of storage time on ultralow-noise laser characteristics.

Main Results:

• The optical dipole trap demonstrated a potential depth of approximately 1 mK.
• Storage times of several tens of seconds were achieved.
• The influence of spin-changing collisions and off-resonant photon scattering was observed in the trapped lithium gas.

Conclusions:

• The novel resonator-enhanced optical dipole trap is well-suited for ultracold gas experiments.
• Ultralow-noise lasers are critical for achieving extended storage times in such traps.
• The trap facilitates detailed studies of atomic interactions and collision dynamics.