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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Apodized holographic beam combiners for dense wavelength multiplexing based on Gaussian-beam interference
Sebastian Nippgen1, Stefan Hengesbach, Martin Traub
1RWTH Aachen University Steinbachstraße 15, Aachen 52074, Germany.
Optics Letters
|December 22, 2012
Summary
Novel apodized volume holographic gratings (VHGs) significantly boost laser brightness. These advanced VHGs suppress sidelobes, improving dense wavelength-multiplexing systems by six times.
Area of Science:
- Optics and Photonics
- Laser Technology
Background:
- High-power diode-laser systems benefit from dense wavelength-multiplexing.
- Volume holographic gratings (VHGs) are key wavelength-selective filters for power scaling.
- Sidelobes in VHG spectral filters limit frequency spacing and system performance.
Purpose of the Study:
- To introduce novel apodized VHGs for improved spectral brightness.
- To investigate the use of Gaussian-beam interference for VHG fabrication.
- To enhance the performance of dense wavelength-multiplexing systems.
Main Methods:
- Simulated novel apodized volume holographic gratings (VHGs).
- Utilized Gaussian-beam interference for VHG production.
- Analyzed spectral filter characteristics, focusing on sidelobe suppression.
Main Results:
- Achieved up to 22 dB of sidelobe suppression with apodized VHGs.
- Maintained conventional grating dimensions.
- Projected a sixfold increase in spectral brightness for dense wavelength-multiplexing systems.
Conclusions:
- Apodized VHGs offer superior sidelobe suppression compared to conventional VHGs.
- Gaussian-beam interference is a viable method for producing high-performance apodized VHGs.
- The developed VHGs significantly enhance the spectral brightness of high-power laser systems.
