Self-pumped phase conjugation induced by an incoherent beam

Area of Science:

• Nonlinear optics
• Photorefractive materials

Background:

• Self-pumped phase conjugation is a key nonlinear optical phenomenon.
• Photorefractive materials like (Barium Strontium) Titanate crystals are widely used in these applications.

Purpose of the Study:

• To investigate the effect of an incoherent beam on self-pumped phase conjugation in (Barium Strontium) Titanate.
• To understand the persistence of these effects after the removal of the incoherent beam.

Main Methods:

• Utilizing an incoherent beam to induce self-pumped phase-conjugate output.
• Analyzing signal beam parameters before, during, and after incoherent beam illumination.
• Observing changes in fanning geometry.

Main Results:

• Self-pumped phase-conjugate output can be eliminated or maintained after the incoherent beam is removed.
• The persistence of the effect depends on signal beam parameters.
• Local modification of the fanning geometry was identified as the cause.

Conclusions:

• Incoherent light can induce persistent changes in photorefractive crystals.
• Fanning geometry modification is a crucial factor in controlling phase conjugation.
• This offers potential for optical beam control and information storage.