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High efficiency mode-locked, cylindrical vector beam fiber laser based on a mode selective coupler.
Optics Express
|August 10, 2017
Summary
We developed a novel fiber laser generating pulsed cylindrical vector beams. This laser uses a mode selective coupler (MSC) in a figure-8 cavity, achieving high mode purity for radial and azimuthal polarization.
Area of Science:
- Photonics and Optics
- Laser Physics
- Fiber Optics
Background:
- Cylindrical vector beams possess unique polarization properties.
- Generating these beams efficiently and with high purity is crucial for applications.
- All-fiber lasers offer advantages in stability and compactness.
Purpose of the Study:
- To propose and demonstrate an all-fiber passively mode-locked laser.
- To generate pulsed cylindrical vector beams.
- To utilize a mode selective coupler (MSC) for beam generation.
Main Methods:
- A figure-8 fiber laser cavity was employed.
- A mode selective coupler (MSC) fabricated from two-mode and single-mode fibers was used.
- Intracavity polarization states were adjusted to control beam polarization.
Main Results:
- Pulsed cylindrical vector beams with radial and azimuthal polarization were generated.
- High mode purity (>94%) was achieved for both polarization states.
- The laser exhibited a slope efficiency >3% and operated at 1556.3 nm.
- Mode-locked pulses had a duration of 17 ns and a repetition rate of 0.66 MHz.
Conclusions:
- An all-fiber passively mode-locked laser capable of generating pulsed cylindrical vector beams was successfully demonstrated.
- The developed mode selective coupler (MSC) effectively functions as a transverse mode converter and splitter.
- The laser system offers a stable and efficient platform for producing high-purity radially and azimuthally polarized beams.
