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High-efficiency frequency doubling of continuous-wave laser light.
Stefan Ast1, Ramon Moghadas Nia, Axel Schönbeck
1Max-Planck-Institute for Gravitational Physics, Albert-Einstein-Institute, Leibniz Universität Hannover, Hannover, Germany.
Optics Letters
|September 3, 2011
Summary
High-efficiency frequency doubling of 1550 nm laser light was achieved using a nonlinear cavity with a periodically poled potassium titanyl phosphate (PPKTP) crystal. This method demonstrates potential for low-decoherence quantum light conversion.
Area of Science:
- Nonlinear optics
- Quantum optics
- Laser physics
Background:
- Continuous-wave (CW) laser systems are crucial for various applications, including quantum information processing.
- Efficient frequency conversion of laser light is essential for generating specific wavelengths required in scientific research and technology.
- Periodically poled potassium titanyl phosphate (PPKTP) crystals are widely used nonlinear optical materials.
Purpose of the Study:
- To demonstrate high-efficiency frequency doubling of 1550 nm CW laser light.
- To investigate the performance of a nonlinear cavity incorporating a PPKTP crystal for frequency conversion.
- To assess the suitability of this technique for low-decoherence quantum state manipulation.
Main Methods:
- Utilizing a nonlinear optical cavity containing a PPKTP crystal.
- Employing a 1.10 W, 1550 nm CW laser as the fundamental field source.
- Measuring the output power at 775 nm and the depletion of the fundamental field.
- Performing numerical simulations to model conversion efficiency and identify limitations.
Main Results:
- Achieved a high external conversion efficiency of 95±1% for frequency doubling.
- Converted 1.10 W of 1550 nm fundamental light to 1.05 W of 775 nm light.
- Observed fundamental field depletion consistent with numerical simulations.
- Identified non-perfect mode and impedance matching as limiting factors for efficiency.
Conclusions:
- Cavity-assisted frequency conversion using PPKTP is highly efficient.
- The achieved efficiency is suitable for applications requiring low-decoherence quantum state conversion.
- Further optimization could enhance conversion efficiency by improving optical coupling into the cavity.
