研究目的
Investigating the amplification of radially polarized beams using single-crystal fiber amplifiers to achieve high average output power in both continuous-wave and femtosecond pulsed operations.
研究成果
The study successfully demonstrated the amplification of a ring-shaped radially polarized seed beam in a single-stage SCF amplifier to an average output power of 290 W in CW operation and 270 W in femtosecond pulsed operation, marking the highest average output power of a radially polarized beam with an SCF amplifier to date.
研究不足
The study is limited by the doping concentration and physical dimensions of the SCFs used, which may affect the maximum achievable output power and beam quality.
1：Experimental Design and Method Selection:
The study utilized a single-stage single-crystal Yb:YAG amplifier for amplifying radially polarized beams. The design focused on achieving high average output power in both CW and femtosecond pulsed operations.
2：Sample Selection and Data Sources:
Two SCFs with doping concentrations of 0.5 at. % and 1 at. % were tested. Both samples had a diameter of 1 mm and a length of 40 mm.
3：5 at. % and 1 at. % were tested. Both samples had a diameter of 1 mm and a length of 40 mm.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A passively mode-locked thin-disk oscillator, fiber-coupled laser diode, dichroic mirrors, and polarizers were used.
4：Experimental Procedures and Operational Workflow:
The seed laser was focused in front of the SCF entrance facet to inject a slightly divergent beam for compensating the thermal lensing within the SCF. The SCF was pumped at a wavelength of 969 nm.
5：Data Analysis Methods:
The beam quality factor was measured in horizontal and vertical directions. The polarization was analyzed qualitatively by rotating a polarizer in front of a camera.
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