Abstract
We measure the transmission characteristics of hollow-core photonic crystal
fiber (HC-PCF) gas cells with ferrule- and fusion-spliced configurations, and near-
and far-field images of the HC-PCF are observed. Results show that the center of
mass (COM) of the far-field image varies with the laser frequency and temperature,
and the moving COM relates to the oscillatory transmission. Using a model of the
spatial interference, we first demonstrate that mainly the modes with asymmetric
phase distributions affect the COM position. The frequency stabilization
performances of the lasers are compared. The fusion-spliced gas cell shows better
performance than the ferrule-spliced one.
© 2014 Chinese Optics Letters
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