Stable, narrow-linewidth laser system with a broad frequency tunability and a fast switching time

Area of Science:

• Atomic Physics
• Laser Spectroscopy
• Quantum Sensing

Background:

• Rydberg atom-based sensors require precise laser wavelength control for frequency tuning.
• Existing laser systems face limitations in achieving the rapid wavelength shifts necessary for dynamic sensing applications.

Purpose of the Study:

• To demonstrate a novel laser system capable of fast and broadband wavelength tuning for Rydberg atom sensors.
• To achieve rapid frequency hopping between Rydberg states for enhanced sensing capabilities.

Main Methods:

• Utilized a frequency-stabilized continuous wave laser combined with an electro-optic frequency comb.
• Employed a filter for individual comb line selection and a high-speed electro-optic modulator for precise frequency tuning.
• Integrated the laser system into Rydberg atom-based sensing experiments to demonstrate frequency hopping.

Main Results:

• Successfully demonstrated a laser system that can switch coupling laser wavelengths by up to 8 nm in under 50 microseconds.
• Achieved frequency hopping between two Rydberg states with a switching time of 400 microseconds, reducible to ~50 microseconds using a ping-pong scheme.
• Showcased a 200 nanosecond switching time when RF frequency updates are not required during hopping.

Conclusions:

• The developed laser system offers significant improvements in switching speed and tuning range for Rydberg atom-based sensors.
• This technology holds substantial potential for advanced radio frequency sensing applications, including communications and radar.
• The fast switching capability paves the way for more dynamic and responsive atomic sensing platforms.