Highly efficient, high-quality phase-conjugate reflection at 308 nm using stimulated Brillouin scattering

Area of Science:

• Optics and Photonics
• Laser Physics
• Nonlinear Optics

Background:

• Phase conjugation is crucial for correcting optical aberrations and improving laser beam quality.
• Stimulated Brillouin scattering (SBS) is a nonlinear optical process that can generate phase-conjugated beams.
• Excimer lasers, such as XeCl, offer high-power output at specific wavelengths.

Purpose of the Study:

• To demonstrate efficient, diffraction-limited phase conjugation of a XeCl laser beam.
• To investigate the use of stimulated Brillouin scattering for high-reflectivity phase conjugation.
• To explore the effectiveness of different liquid media for the SBS process.

Main Methods:

• Utilized a XeCl laser source with a narrow linewidth (<0.15 cm(-1)).
• Employed stimulated Brillouin scattering (SBS) by focusing the laser beam into liquid media.
• Investigated heptane and ethanol as nonlinear media for SBS.

Main Results:

• Achieved efficient, diffraction-limited phase conjugation of the 308 nm XeCl laser beam.
• Obtained high SBS reflectivities approaching 100%.
• Demonstrated successful phase conjugation at high laser intensities (300 GW/cm(2)).

Conclusions:

• Stimulated Brillouin scattering is a highly effective method for achieving efficient phase conjugation of XeCl laser radiation.
• Heptane and ethanol are suitable nonlinear media for high-reflectivity SBS phase conjugation.
• The technique holds promise for applications requiring high-quality, high-power laser beams.