Watt-level narrow-linewidth fibered laser source at 852 nm for FIB application

Area of Science:

• Atomic, Molecular, and Optical Physics
• Laser Physics and Photonics

Background:

• Laser cooling of atoms requires stable, high-power laser sources at specific wavelengths.
• Cesium atoms are commonly used in atomic clocks and quantum simulations.

Purpose of the Study:

• To develop a compact, robust, and high-power fiber laser source at 852 nm for laser cooling of cesium atoms.
• To demonstrate the laser source's performance in a focused ion beam experiment.

Main Methods:

• Sum-frequency generation (SFG) of 1540 nm and 1908 nm lasers using a periodically poled lithium niobate (PPLN) waveguide.
• Development of a narrow-linewidth (20 kHz) distributed feedback (DFB) fiber laser at 1908 nm.
• Integration into an all-fibered, polarized laser system.

Main Results:

• A 1W all-fibered, polarized, compact, and robust laser source at 852 nm was successfully realized.
• A conversion efficiency of 40% was achieved for the sum-frequency generation process.
• The laser source demonstrated effective operation in a focused ion beam (FIB) experiment with cold cesium atoms.

Conclusions:

• The developed laser source meets the requirements for efficient laser cooling of cesium atoms.
• The all-fibered architecture ensures compactness and robustness for practical applications.
• The high conversion efficiency and narrow linewidth contribute to the system's overall performance.