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Cladding-pumped ytterbium-doped fiber laser with radially polarized output
Optics Letters
|October 15, 2015
Summary
Researchers developed a simple method to create radially polarized fiber laser beams using a special waveplate. This technique achieved high power and excellent polarization purity for the output beam.
Area of Science:
- Optics and Photonics
- Laser Physics
- Materials Science
Background:
- Radially polarized beams are crucial for advanced applications like particle acceleration and microscopy.
- Generating these beams efficiently from fiber lasers has been a significant challenge in laser technology.
Purpose of the Study:
- To demonstrate a straightforward method for directly generating a radially polarized output beam from a cladding-pumped ytterbium-doped fiber laser.
- To characterize the performance of the generated beam in terms of power, efficiency, and polarization purity.
Main Methods:
- Utilized a nanograting spatially variant waveplate as an intracavity polarization-controlling element.
- Employed a cladding-pumped ytterbium-doped fiber laser architecture.
Main Results:
- Achieved ~32 W of output power, limited by available pump power.
- Generated a radially polarized TM(01)-mode output beam at 1040 nm.
- Obtained a high slope efficiency of 66% and polarization purity of 95%.
- Measured a beam-propagation factor (M²) of approximately 1.9-2.1, indicating good beam quality.
Conclusions:
- The developed technique offers a simple and effective way to generate high-quality radially polarized beams from fiber lasers.
- The nanograting waveplate approach is a promising solution for producing radially polarized light for various scientific and industrial applications.
