Practical GHz single-cavity all-fiber dual-comb laser for high-speed spectroscopy
arxiv(2024)
摘要
Dual-comb spectroscopy (DCS) with few-GHz tooth spacing that provides the
optimal trade-off between spectral resolution and refresh rate is a powerful
tool for measuring and analyzing rapidly evolving transient events. Despite
such an exciting opportunity, existing technologies compromise either the
spectral resolution or refresh rate, leaving few-GHz DCS with robust design
largely unmet for frontier applications. In this work, we demonstrate a novel
GHz DCS by exploring the multimode interference-mediated spectral filtering
effect in an all-fiber ultrashort cavity configuration. The GHz single-cavity
all-fiber dual-comb source is seeded by a dual-wavelength mode-locked fiber
laser operating at fundamental repetition rates of about 1.0 GHz differing by
148 kHz, which has an excellent stability in the free-running state that the
Allan deviation is only 101.7 mHz for an average time of 1 second. Thanks to
the large repetition rate difference between the asynchronous dichromatic pulse
trains, the GHz DCS enables a refresh time as short as 6.75 us, making it
promising for studying nonrepeatable transient phenomena in real time. To this
end, the practicality of the present GHz DCS is validated by successfully
capturing the 'shock waves' of balloon and firecracker explosions outdoors.
This GHz single-cavity all-fiber dual-comb system promises a noteworthy
improvement in acquisition speed and reliability without sacrificing
measurement accuracy, anticipated as a practical tool for high-speed
applications.
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