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Published on: July 12, 2017
Enhanced beam amplification in a photorefractive Bi(12)TiO(20) crystal by internal reflections
Optics Letters
|October 31, 2009
Summary
Internal reflections in bismuth titanate crystals enhance beam amplification through two-beam coupling. This method boosts signal gain by manipulating polarization states and redirecting fanned beams for improved amplification.
Area of Science:
- Nonlinear optics
- Photorefractive materials
Background:
- Two-beam coupling is a key nonlinear optical process for light amplification.
- Bismuth titanate (Bi12TiO20) crystals are known for their photorefractive properties.
Purpose of the Study:
- To investigate the effect of internal reflections on beam amplification in a Bi12TiO20 crystal.
- To enhance two-beam coupling gain using crystal boundary reflections.
Main Methods:
- Experimental demonstration of two-beam coupling in a long Bi12TiO20 crystal.
- Utilizing internal reflections of signal and pump beams.
- Adjusting spatial period of polarization state transformation.
- Redirecting fanned beams via reflections.
Main Results:
- Internal reflections significantly increase beam amplification in Bi12TiO20.
- Amplification enhancement achieved by controlling polarization state transformations via reflections.
- Strong fanning redirection allows the fanned beam to act as a pump, increasing net gain.
Conclusions:
- Internal reflections offer a viable method to boost beam amplification in photorefractive crystals.
- The technique is effective in both low and high fanning regimes.
- This approach provides a novel way to enhance energy transfer in nonlinear optical interactions.
