Linearizing response of adaptive interferometer based on dynamic grating in erbium-doped fiber with saturable absorption
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 ( <...
| Authors: | ; ; |
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| Format: | Article |
| Status: | Published version |
| Publication date: | 2007 |
| Country: | México |
| Institution: | INAOE |
| Repository: | Redalyc-INAOE |
| OAI Identifier: | oai:redalyc.org:57021690010 |
| Online Access: | https://www.redalyc.org/articulo.oa?id=57021690010 |
| Access Level: | Open access |
| Keyword: | Física, Astronomía y Matemáticas erbium doped fiber population gratings Adaptive interferometry |
| Summary: | 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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