Efficient sub-Doppler laser cooling of an Indium atomic beam

Area of Science:

• Atomic Physics
• Laser Cooling
• Quantum Optics

Background:

• Laser cooling techniques are crucial for manipulating atomic beams.
• Indium atoms present unique challenges and opportunities for laser cooling applications.
• Achieving sub-Doppler cooling is essential for high-precision experiments.

Purpose of the Study:

• To demonstrate efficient transverse cooling of an Indium atomic beam.
• To explore the combination of optical pumping and UV laser cooling for Indium.
• To assess the potential for creating high-brightness Indium atomic beams.

Main Methods:

• Utilized a closed-cycle UV laser transition at 325.6 nm.
• Implemented optical pumping to enhance atom population in the cooling transition.
• Measured the transverse velocity distribution of the Indium atomic beam.

Main Results:

• Achieved transverse cooling of the Indium atomic beam to 13.5+/-3.8 cm/s.
• Reduced atomic velocity significantly below the Doppler cooling limit.
• Enhanced the fraction of laser-cooled Indium atoms to 12+/-3 % via optical pumping.

Conclusions:

• The combined optical pumping and UV laser cooling approach is effective for Indium.
• The method shows potential for scaling to near 100% cooling efficiency.
• Indium is now a viable element for laser cooling applications, enabling new technological possibilities.