研究目的
Investigating the noise features of a double-clad ytterbium-doped fiber laser (YDFL) with Fabry-Perot cavity formed by two fiber Bragg gratings.
研究成果
The YDFL operates in a regime of noise pulses with random magnitudes and widths, with the coherence time decreasing from ~1 ns to tens picoseconds as the laser power increases from 1 W to 22 W. The laser's photon statistics are described by the M-fold degenerate Bose-Einstein distribution, indicating operation in a regime statistically equal to narrowband amplified spontaneous emission.
研究不足
The study is limited to a specific configuration of YDFL with Fabry-Perot cavity and may not be directly applicable to other laser configurations. The analysis of photon statistics and coherence time is based on certain assumptions and models that may not capture all aspects of the laser's behavior.
1：Experimental Design and Method Selection:
The YDFL was assembled in a Fabry-Perot cavity with two fiber Bragg gratings (FBGs) used as narrowband reflectors. The laser's output was analyzed in terms of photon statistics, probability density, and autocorrelation functions.
2：Sample Selection and Data Sources:
The YDF used was a standard double-clad fiber with cladding absorption of ~1.65 dB/m at 975 nm and mode field diameter (MFD) of 6.5 μm at the laser wavelength (1061 nm). YDF length was 15 m.
3：65 dB/m at 975 nm and mode field diameter (MFD) of 5 μm at the laser wavelength (1061 nm). YDF length was 15 m.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included a 25-GHz InGaAs Schottky photodetector connected to a 16-GHz real-time oscilloscope, an optical spectrum analyzer (OSA), and a fiber polarizer for studying statistical properties of polarized light.
4：Experimental Procedures and Operational Workflow:
The laser signal was detected and analyzed for different output powers, ranging from 1 W to 22 W. The coherence time and photon statistics were measured and analyzed.
5：Data Analysis Methods:
The data were analyzed using the formalism of autocorrelation function for intensity and the M-fold degenerate Bose-Einstein distribution for photon statistics.
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