研究目的
Investigating the stabilization techniques of repetition rate in ultrafast Yb doped all fiber oscillators to overcome the limitations of traditional methods.
研究成果
The study successfully demonstrates an all-fiber concept for precise repetition rate control in ultrafast Yb doped oscillators, overcoming traditional limitations. The use of refractive index modification and PLL electronics provides a stable and precise control mechanism. Future work could explore schemes to enhance the system's frequency response.
研究不足
The frequency response showed a -3 dB level at around 25 Hz, indicating limitations in the system's response speed. The study suggests that a scheme with additional wavelength division multiplexer and beam splitter could potentially increase the cut-off frequency by around 10 times.
1：Experimental Design and Method Selection:
The study employs an all-fiber concept for precise repetition rate control using refractive index modification in Er-doped fiber core induced by pump laser power change.
2：Sample Selection and Data Sources:
The setup includes a SESAM mode-locked oscillator with Ytterbium doped gain fiber and chirped fiber Bragg grating for dispersion management.
3：List of Experimental Equipment and Materials:
Equipment includes laser diodes (976 nm and 1550 nm), chirped fiber Bragg grating, thermoelectric cooler, wavelength division multiplexer, beam splitter, semiconductor saturable absorber mirror, photodiode, and phase-locked loop electronics.
4：Experimental Procedures and Operational Workflow:
The repetition rate is measured using an InGaAs photodiode and analyzed by PLL electronics, with phase shift compensated by controlling precise and coarse delay lines.
5：Data Analysis Methods:
Timing jitter is measured using a high bandwidth oscilloscope, and phase shift frequency response is measured using a fiber integrated Mach-Zehnder interferometer setup.
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