研究目的
Investigating the development of a widely tunable ytterbium-doped single frequency all-fiber laser with high stability, ultra-narrow linewidth, and wide tuning range.
研究成果
The study successfully demonstrates a widely tunable ytterbium-doped single frequency all-fiber laser with a tuning range of 55 nm, an ultra-narrow linewidth of 435 Hz, and high stability. This provides a new method for achieving wide-range tunable single frequency fiber lasers, beneficial for applications in optical communication, laser ranging, and spectroscopy.
研究不足
The main limitation is the light loss of the fused PMF, which increases the threshold of the fiber laser. Suitable discharge time is crucial for minimizing this loss.
1：Experimental Design and Method Selection:
The study employs a computer-controlled tunable filter (CTF) and a home-made comb spectrum filter (CSF) to achieve single frequency operation. The CSF is realized by fusing a single strand of polarization maintaining optical fiber into a double-circulator interferometer.
2：Sample Selection and Data Sources:
A high stability 975 nm laser diode is used as the pump source, and a highly doped, single mode Ytterbium-doped fiber (YDF) serves as the active medium.
3：List of Experimental Equipment and Materials:
Equipment includes a 975 nm laser diode, wavelength division multiplexer (WDM), YDF, CTF, circulators, polarization controller (PC), PMF, and optical spectrum analyzer (OSA).
4：Experimental Procedures and Operational Workflow:
The setup involves pumping the YDF through a WDM, using the CTF for wavelength selection, and the CSF for spectral narrowing to achieve single frequency operation.
5：Data Analysis Methods:
The spectral performance is verified by theoretical and experimental studies, and the linewidth is measured using the delayed self-heterodyne method (DSHM).
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optical spectrum analyzer
AQ6370C
Yokogawa
Measuring the spectral performance of the comb filter
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Fabry-Pérot interferometer
S210
Thorlabs
Monitoring the single frequency state of the laser
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acoustic-optic modulator
S-M 150–0.4C2G-3-F2S
Gooch&Housego
Used in the delayed self-heterodyne method for linewidth measurement
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laser diode
975 nm
Pump source for the fiber laser
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Ytterbium-doped fiber
LIEKKI Yb1200-4/125
LIEKKI
Active medium in the fiber laser
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RF spectrum analyzer
N9000A
KENSIGHT
Measuring the heterodyne signal in the delayed self-heterodyne method
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