A self-injected, diode-pumped, solid-state ring laser for laser cooling of Li atoms

Area of Science:

• Atomic physics
• Laser spectroscopy
• Quantum optics

Background:

• Laser cooling of atoms requires stable, tunable, and high-power light sources.
• Lithium atoms, particularly fermionic isotopes, are crucial for studying quantum phenomena.
• Previous light sources faced limitations in stability, tunability, or power for advanced atomic experiments.

Purpose of the Study:

• To construct a novel solid-state light source for laser cooling lithium atoms.
• To achieve high output power, unidirectional lasing, and single-frequency operation.
• To enable continuous frequency tuning for precise control over atomic interactions.

Main Methods:

• Utilized a Nd:YVO4 ring laser system with second-harmonic generation.
• Implemented weak coupling to an external cavity for improved mode selection and loss control.
• Employed simultaneous control of two piezoelectric transducers (PZTs) for continuous frequency tuning.

Main Results:

• Achieved unidirectional lasing with improved mode selection and high output power.
• Demonstrated continuous frequency tuning via synchronized PZT control.
• Successfully utilized the light source to trap and cool fermionic lithium atoms.

Conclusions:

• The developed solid-state light source is effective for laser cooling lithium atoms.
• The system enables reaching the quantum degenerate regime for fermionic lithium.
• This advancement facilitates further research in ultracold atom physics and quantum simulation.