研究目的
To demonstrate a single-frequency linear cavity fiber laser at 1030 nm with a distributed Bragg reflector cavity configuration, achieving single-frequency lasing through proper temperature control of two FBGs to narrow the gain bandwidth.
研究成果
The study successfully demonstrated a single-frequency DBR fiber laser at 1030 nm by thermally adjusting the FBGs to compress the gain bandwidth, achieving a narrow linewidth and stable output power. The approach offers a promising method for single-frequency lasing without the need for extremely short cavity lengths or high-reflectivity FBGs.
研究不足
The experiment's limitations include the technical difficulty in simultaneously compressing the bandwidth and increasing the reflectivity of FBGs, and the potential for longitudinal-mode switching with increased pump power when the HR-FBG temperature exceeds 44 °C.
1：Experimental Design and Method Selection:
The experiment involved designing a single-frequency DBR fiber laser operating at 1030 nm using a backward-pumped configuration with a polarization-maintaining 976/1030 nm wavelength division multiplexing coupler. The laser cavity was formed by a high-reflectivity FBG and a polarization-maintaining FBG acting as an output coupler.
2：Sample Selection and Data Sources:
A
3：9 cm-long commercial heavily Yb3+-doped silica fiber was used as the gain medium. List of Experimental Equipment and Materials:
Equipment included a fiber pigtailed single-mode laser diode, PM-WDM coupler, HR-FBG, OC-FBG, Yb3+-doped silica fiber, quartz glass tube, copper heat sinks, dual-channel temperature controller, polarization-maintaining fiber optical isolator, optical spectrum analyzer, Fabry–Perot interferometer, electrical spectrum analyzer, and InGaAs photodetector.
4：Experimental Procedures and Operational Workflow:
The FBGs and gain fiber were assembled into a quartz glass tube, with FBG parts placed in copper heat sinks for temperature control. The laser's performance was evaluated under varying pump powers and temperatures.
5：Data Analysis Methods:
The laser's linewidth and relative intensity noise were measured using a delayed self-heterodyne interferometer and an electrical spectrum analyzer, respectively.
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optical spectrum analyzer
AQ6370C
Yokogawa
Used to observe the spectra of the FBGs and the laser output.
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Fabry–Perot interferometer
SA210
Thorlabs
Used to verify the single-longitudinal mode characteristics of the laser.
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electrical spectrum analyzer
NA9000A
KEYSIGHT
Used to measure the linewidth and relative intensity noise of the laser.
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fiber pigtailed single-mode laser diode
Used as the backward pump source for the fiber laser.
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polarization-maintaining 976/1030 nm wavelength division multiplexing coupler
PM-WDM
Connects the pump source to the fiber laser cavity.
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high-reflectivity FBG
HR-FBG
Acts as one of the reflectors in the laser cavity.
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polarization-maintaining FBG
OC-FBG
Acts as the output coupler in the laser cavity.
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Yb3+-doped silica fiber
DF1100
Fibercore
Used as the gain medium in the laser cavity.
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dual-channel temperature controller
Controls the temperature of the FBGs to adjust their reflection spectra.
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polarization-maintaining fiber optical isolator
Prevents the influence of reflected light on the laser's stability.
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InGaAs photodetector
Used in conjunction with the electrical spectrum analyzer to measure the laser's relative intensity noise.
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