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24 April 2024 |
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Picometer-resolution dual-comb spectroscopy with a free-running fibre laser | | Xin Zhao
; Guoqing Hu
; Bofeng Zhao
; Cui Li
; Yingling Pan
; Ya Liu
; Takeshi Yasui
; Zheng Zheng
; | | Date: |
25 Feb 2016 | | Abstract: | Dual-comb spectroscopy utilizes two sets of comb lines with slightly
different comb-tooth-spacings, and optical spectral information is acquired by
measuring the radio-frequency beat notes between the sets of comb lines. It
holds the promise as a real-time, high-resolution analytical spectroscopy tool
for a range of important applications. However, the stringent requirement on
the coherence between comb lines from two separate lasers and the sophisticated
control system to achieve that have confined the technology to the top
metrology laboratories. By replacing electronics with the law of physics in
lasers, a much simpler, dual-comb spectroscopy scheme is demonstrated here
using just one dual-wavelength, passively mode-locked fiber laser. Dual-comb
pulses with a repetition-frequency difference determined by the intracavity
dispersion are shown to be robust against common-mode cavity drifts and noises.
As sufficiently low relative linewidth is maintained between two sets of comb
lines, capability to resolve picometer-wide spectral features is demonstrated
using the simplest data acquisition and processing system in an all-fiber setup
without further active control. Possibility to use energy-efficient and compact
free-running fiber lasers with small comb-tooth-spacings could bring a
fundamental change in the paradigm of dual-comb spectroscopy. By drastically
lowering its system complexity, the technology could be rendered affordable to
a plethora of new applications. | | Source: | arXiv, 1602.7788 | | Services: | Forum | Review | PDF | Favorites | |
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