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Optics Communications

Phase contribution to dynamic gratings recorded in Er-doped fiber with saturable absorption

Serguei I. Stepanov, Eliseo Hernández

Published Oct 11, 2006• 37 citations
Publisher
DOI
10.1016/j.optcom.2006.09.044

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Linearizing response of adaptive interferometer based on dynamic grating in erbium-doped fiber with saturable absorption

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"Because of the unshifted type of recorded amplitude gratings, adaptive interferometers based on dynamic population gratings in Er-doped fibers with saturable absorption demonstrate an essentially quadratic response and, as a result, are not sensitive enough to detect a small object displacement ( < ¿/4), and cannot distinguish the displacement direction. We propose, and experimentally demonstrate, two techniques for their linearization which are based on externally introduced phase off-set between the recording interference pattern and the recorded grating. In the transient technique, the application of a fast ¼/2 phase jump in the detected wave makes the system response linear during the transient time of the grating formation T g (typically of a millisecond-submillisecond scale in Er-doped fibers)..."

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Effective recording of dynamic phase gratings in Yb-doped fibers with saturable absorption at 1064nm

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Results of investigation of transient two-wave mixing via dynamic population gratings in Yb-doped fibers with saturable absorption are reported. The recorded gratings are characterized by submillisecond formation times and at wavelength lambda = 1064 nm need cw recording light power of 1 - 10 mW scale. What is important for different applications, the dynamic gratings were found to be predominantly of a phase type with an admixture of a significantly weaker amplitude component only. As in Er-doped fibers, the amplitude grating component proved to be essentially inferior to the theoretical estimation based on the fiber optical density and saturation power.

Optics Express•Jan 1, 2007•52 citations
"Because of the unshifted type of recorded amplitude gratings, adaptive interferometers based on dynamic population gratings in Er-doped fibers with saturable absorption demonstrate an essentially quadratic response and, as a result, are not sensitive enough to detect a small object displacement ( < ¿/4), and cannot distinguish the displacement direction. We propose, and experimentally demonstrate, two techniques for their linearization which are based on externally introduced phase off-set between the recording interference pattern and the recorded grating. In the transient technique, the application of a fast ¼/2 phase jump in the detected wave makes the system response linear during the transient time of the grating formation T g (typically of a millisecond-submillisecond scale in Er-doped fibers)..."
Results of investigation of transient two-wave mixing via dynamic population gratings in Yb-doped fibers with saturable absorption are reported. The recorded gratings are characterized by submillisecond formation times and at wavelength lambda = 1064 nm need cw recording light power of 1 - 10 mW scale. What is important for different applications, the dynamic gratings were found to be predominantly of a phase type with an admixture of a significantly weaker amplitude component only. As in Er-doped fibers, the amplitude grating component proved to be essentially inferior to the theoretical estimation based on the fiber optical density and saturation power.