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First-order quasi-phase-matched second-harmonic generation in a LiTaO(3) waveguide
Applied Optics
|October 2, 2010
Summary
Researchers improved second-harmonic generation efficiency using a lithium tantalate waveguide. This advancement enables efficient blue light generation from lasers, with potential applications in optical devices.
Area of Science:
- Nonlinear optics
- Materials science
Background:
- Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
- Lithium tantalate (LiTaO3) waveguides are investigated for efficient nonlinear optical processes.
Purpose of the Study:
- To enhance conversion efficiency in a first-order quasi-phase-matched SHG device.
- To characterize the fabrication process and performance of LiTaO3 waveguides for SHG.
Main Methods:
- Fabrication of a strongly confined LiTaO3 waveguide using proton exchange and rapid thermal annealing.
- Experimental characterization of the device's performance with a Ti:Al2O3 laser and a diode laser.
Main Results:
- Achieved 18% conversion efficiency and 22 mW blue light power using a Ti:Al2O3 laser.
- Generated 1.3 mW blue light with 4% conversion efficiency via direct diode-laser doubling.
- Observed FWHM acceptance bandwidths of 2.5 °C (temperature) and 0.13 nm (wavelength).
Conclusions:
- The optimized LiTaO3 waveguide fabrication enhances light mode overlap for efficient SHG.
- The device demonstrates high performance for blue light generation, suitable for various laser sources.
