A stable phase-locking-free single beam optical lattice with multiple configurations

TL;DR

This paper introduces a phase-locking-free method to create stable optical lattices using a single laser beam passing through a symmetric prism, simplifying setup and enhancing stability for quantum applications.

Contribution

The authors propose a novel scheme that eliminates the need for phase-locking in optical lattices, demonstrating multiple configurations with high stability.

Findings

Achieved stable optical lattices with less than 1.14% change in lattice constant.

Demonstrated stable triangular and quasi-crystal lattices with minimal drift.

Validated the scheme's effectiveness for various lattice geometries.

Abstract

Optical lattices formed by interfering laser beams are widely used to trap and manipulate atoms for quantum simulation, metrology, and computation. To stabilize optical lattices in experiments, it is usually challenging to implement delicate phase-locking systems with complicated optics and electronics to reduce the relative phase fluctuation of multiple laser beams. Here we report a phase-locking-free scheme to implement optical lattices by passing a single laser beam through a prism with n-fold symmetric facets and large apex angles. The scheme ensures a stable optical lattice since the interference occurs among different deflected parts of a single laser beam without any moving component. Various lattice configurations, including a triangular lattice and a quasi-crystal lattice with ten-fold symmetry are demonstrated. In both cases, stability measurements show a change of lattice constant in less than 1.14%, and a drift of lattice position in less than 1.61%.