Wavelength-tunable narrow-linewidth gaseous Raman laser.

Area of Science:

• Laser Physics
• Nonlinear Optics

Background:

• Gaseous Raman lasers offer various wavelengths but lack tunability.
• Achieving narrow linewidths in Raman lasers is crucial for many applications.

Purpose of the Study:

• To develop a method for creating fine-tunable, narrow-linewidth gaseous Raman lasers.
• To demonstrate wavelength tuning of first Stokes (S1), first anti-Stokes, and second Stokes Raman lasers.

Main Methods:

• Utilized a 532 nm pump laser with a narrow-linewidth seed laser injection.
• Developed a theoretical model to simulate Raman laser spectral profiles.
• Experimentally validated simulation results.

Main Results:

• Achieved a narrow-linewidth first Stokes (S1) Raman laser with seed injection.
• Demonstrated a S1 tuning range of 1 cm⁻¹ by adjusting the seed laser wavelength.
• Observed tunable wavelengths for first anti-Stokes and second Stokes lasers.
• Experimental and simulated spectral profiles showed excellent agreement.

Conclusions:

• Presented a universal method for generating fine-tunable Raman lasers.
• The developed technique allows for significant linewidth compression (predicted 0.01 cm⁻¹).
• This tunable Raman laser technology has potential in various important applications.