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High-average-power second-harmonic generation from periodically poled silica fibers
Albert Canagasabey1, Costantino Corbari, Alexey V Gladyshev
1Optoelectronics Research Centre, University of Southampton, SO17 1BJ, United Kingdom. asc@orc.soton.ac.uk
Optics Letters
|August 18, 2009
Summary
Researchers achieved 236 mW of second-harmonic power using a 32-cm periodically poled silica fiber. This record-breaking result stems from an improved fiber design and longer nonlinear interaction length.
Area of Science:
- Nonlinear optics
- Fiber optics
- Materials science
Background:
- Periodically poled silica fibers are crucial for nonlinear optical applications.
- Previous limitations in conversion efficiency and power output hindered practical use.
Purpose of the Study:
- To enhance second-harmonic generation (SHG) power and conversion efficiency in periodically poled silica fibers.
- To investigate the impact of improved fiber design and interaction length on SHG performance.
Main Methods:
- Fabrication of a 32-cm-long specialty twin-hole silica fiber with optimized periodic poling.
- Characterization of the fiber's nonlinear optical properties, specifically second-harmonic generation.
- Measurement of output power and conversion efficiency at the second harmonic wavelength.
Main Results:
- Generation of 236 mW of second-harmonic power.
- Achieved an average conversion efficiency of 15.2 ± 0.5%.
- Demonstrated the highest normalized second-harmonic conversion and average power for this type of fiber.
Conclusions:
- An improved specialty twin-hole fiber design significantly enhances SHG performance.
- Extending the nonlinear interaction length is key to achieving higher power and efficiency.
- This work sets a new benchmark for periodically poled silica fibers in nonlinear optics.
