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An efficient compact 300 mW narrow-linewidth single frequency fiber laser at 1.5 microm
1Institute of Optical Communication Materials, South China University of Technology, GuangZhou, P. R. China.
Optics Express
|February 23, 2010
Summary
A novel Er(3+)/Yb(3+) co-doped fiber laser achieves over 300 mW of stable, single-frequency output at 1.5 micrometers. This efficient fiber laser demonstrates a narrow linewidth (<2 kHz) and low noise, making it suitable for various applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Fiber lasers offer advantages in beam quality and efficiency.
- Erbium (Er3+) and Ytterbium (Yb3+) co-doping is a common strategy for achieving laser emission in the 1.5-micrometer range.
- Developing efficient and stable single-frequency fiber lasers is crucial for telecommunications and sensing.
Purpose of the Study:
- To demonstrate an efficient single-frequency fiber laser.
- To utilize a newly-developed Er(3+)/Yb(3+) co-doped single mode phosphate glass fiber.
- To characterize the laser's performance, including gain, loss, output power, efficiency, linewidth, and noise.
Main Methods:
- Fabrication and characterization of Er(3+)/Yb(3+) co-doped phosphate glass fiber.
- Construction and operation of a fiber laser using the developed active fiber.
- Measurement of key laser parameters: net gain, propagation loss, output power, slope efficiency, quantum efficiency, linewidth, and relative intensity noise (RIN).
Main Results:
- Achieved a net gain coefficient of 5.2 dB/cm and a propagation loss coefficient of 0.04 dB/cm.
- Generated over 300 mW of stable continuous-wave (CW) single transverse and longitudinal mode seed lasering at 1.5 micrometers from a 2.0 cm-long fiber.
- Measured a slope efficiency of 30.9% and a quantum efficiency of 0.938 ± 0.081.
- Observed a linewidth less than 2 kHz and RIN around -120 dB/Hz (50-500 kHz).
Conclusions:
- The newly-developed Er(3+)/Yb(3+) co-doped phosphate glass fiber enables efficient single-frequency fiber laser operation.
- The demonstrated fiber laser exhibits excellent performance characteristics, including high output power, narrow linewidth, and low noise.
- This work contributes to the development of advanced fiber laser sources for demanding applications.
