Implementation of a stable, high-power optical lattice for quantum gas microscopy

Area of Science:

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

Background:

• Optical lattices are essential for studying ultracold quantum gases.
• Generating stable, high-power optical lattices presents significant technical challenges.
• Precise control over lattice parameters is critical for quantum simulations.

Purpose of the Study:

• To design and implement a stable, high-power 1064 nm laser system for generating optical lattices.
• To achieve high stability in lattice site positions and spacing for ultracold quantum gas experiments.
• To provide a robust platform for advanced quantum gas research.

Main Methods:

• A low-noise laser is amplified using four modified high-power fiber amplifiers.
• A nonlinear feedback loop is employed for beam intensity stabilization and control.
• Real-time monitoring of the optical lattice is used to assess stability.

Main Results:

• The optical lattice site positions exhibit stability well below the lattice spacing over hours.
• The harmonic trap position, defined by the lattice beam envelope, is stable to approximately one lattice spacing.
• Long-term (six-month) relative root-mean-square stability of the lattice spacing is measured at 0.5%.

Conclusions:

• The developed laser system provides a highly stable platform for generating optical lattices.
• The achieved stability meets the stringent requirements for experiments with ultracold quantum gases.
• This system enables precise control and long-term stability for quantum gas research.