Continuous-wave Lyman-alpha generation with solid-state lasers

Area of Science:

• Atomic Physics
• Nonlinear Optics
• Laser Spectroscopy

Background:

• Generating coherent Lyman-alpha (Lyα) light is crucial for various spectroscopic applications.
• Existing methods often face limitations in efficiency or tunability.
• Four-wave sum-frequency mixing (FWSFM) offers a potential pathway for Lyα generation.

Purpose of the Study:

• To realize a coherent continuous-wave (CW) Lyman-alpha source.
• To investigate the enhancement mechanisms of nonlinear susceptibility in mercury vapor.
• To observe and analyze the phase matching characteristics of the FWSFM process for Lyα generation.

Main Methods:

• Utilized solid-state lasers to drive four-wave sum-frequency mixing in mercury vapor.
• Exploited 6(1)S - 7(1)S two-photon resonance and 6(1)S-6(3)P one-photon resonance to enhance third-order nonlinear susceptibility.
• Observed and characterized the phase matching curve for the FWSFM Lyα generation process.
• Investigated the two-photon enhancement of Lyα yield and isotope-dependent shifts.

Main Results:

• Successfully realized a CW coherent Lyman-alpha source using FWSFM in mercury vapor.
• Demonstrated significant enhancement of nonlinear susceptibility via resonant enhancement.
• Observed the phase matching curve for this specific FWSFM scheme for the first time.
• Observed shifts in Lyα generation maxima relative to two-photon resonances across different isotopes.

Conclusions:

• The developed FWSFM technique provides a viable route for generating CW coherent Lyman-alpha radiation.
• Resonant enhancement significantly boosts the efficiency of Lyα generation.
• Understanding isotope effects is important for optimizing Lyα generation in mercury vapor.