High-resolution Cs-Rb two-photon spectrometer for directly stabilizing a Ti:sapphire comb laser

Area of Science:

• Atomic, Molecular, and Optical Physics
• Spectroscopy
• Laser Science

Background:

• Comb laser spectroscopy is a powerful tool but can be limited by residual Doppler background.
• Stabilizing laser frequencies directly to atomic transitions is crucial for precision measurements.

Purpose of the Study:

• To present a simple and efficient scheme for removing residual Doppler background in comb laser spectroscopy.
• To demonstrate the direct frequency stabilization of a mode-locked Ti:sapphire laser using atomic transitions.
• To establish a standard operation procedure for fully direct comb laser stabilization.

Main Methods:

• Implementing a novel scheme to suppress Doppler background in a two-photon spectrometer.
• Utilizing cesium (6S-8S) and rubidium (5S-5D) atomic transitions for frequency reference.
• Developing a standard operation procedure for direct comb laser stabilization.

Main Results:

• Achieved a background-to-signal ratio better than 10^-3.
• Successfully stabilized a mode-locked Ti:sapphire laser's frequency.
• Demonstrated an all-atomic-transition-based Ti:sapphire comb laser using a compact 6-cm glass cell.

Conclusions:

• The presented scheme effectively removes Doppler background, enhancing comb laser spectroscopy.
• Direct frequency stabilization using atomic transitions is feasible and demonstrated.
• This work paves the way for compact, all-atomic-transition-based laser systems.