Abstract
Doppler-free saturated absorption spectroscopy of gases
in hollow-core fiber (HCF)-based cells can be used for
realizing new compact, robust, and portable frequency
standards. In this paper, methods for cancelling
interferences resulting from the optical connections
between standard fiber and HCF and other factors such as
varying coupling to HCF modes are investigated. Laser
power modulation with simultaneous detection of ac and dc
signal is used to separate saturated absorption from
interferences. In addition, a technique of two
piezoelectric stack actuators stretching the fiber at
different locations is described. The presented
experimental results demonstrate that 99% interference
attenuation is readily attainable with the techniques.
Frequency comb-referenced measurement of saturated
acetylene absorption features near 1.54 ?m, with fiber
length and power modulation, is presented. For
comparison, measurements and results of the same
acetylene fiber, using a system having pump and probe
beams at mutually shifted frequencies, are also given.
Original language | English |
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Article number | 7060653 |
Pages (from-to) | 1595-1599 |
Journal | IEEE Transactions on Instrumentation and Measurement |
Volume | 64 |
Issue number | 6 |
DOIs | |
Publication status | Published - 1 Jun 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- Frequency measurement standards
- infrared spectra
- interference cancellation
- measurement techniques
- metrology
- optical fiber
- spectroscopy