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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 25 — Sep. 1, 2004
  • pp: 4915–4921

Frequency-shifted optical feedback in a pumping laser diode dynamically amplified by a microchip laser

Eric Lacot and Olivier Hugon  »View Author Affiliations


Applied Optics, Vol. 43, Issue 25, pp. 4915-4921 (2004)
http://dx.doi.org/10.1364/AO.43.004915


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Abstract

Compared with conventional optical heterodyne detection, laser optical feedback imaging (LOFI) allows for a several orders of magnitude higher intensity modulation contrast. The maximum contrast amplification is typically 103 for a diode laser in the gigahertz range and 106 for a microchip laser in the megahertz range. To take advantage of the wavelength tunability of a laser diode and of the lower resonant detection frequency of a microchip laser, we used LOFI modulation induced by the frequency-shifted optical feedback in a laser diode as a modulated pumping power for a microchip laser for resonant dynamic amplification. In this way, we were able to transfer the optical feedback sensitivity of the laser diode to the megahertz range. Application to telemetry is also reported.

© 2004 Optical Society of America

OCIS Codes
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(120.5820) Instrumentation, measurement, and metrology : Scattering measurements
(140.3480) Lasers and laser optics : Lasers, diode-pumped
(180.3170) Microscopy : Interference microscopy

History
Original Manuscript: September 19, 2003
Revised Manuscript: April 16, 2004
Manuscript Accepted: May 17, 2004
Published: September 1, 2004

Citation
Eric Lacot and Olivier Hugon, "Frequency-shifted optical feedback in a pumping laser diode dynamically amplified by a microchip laser," Appl. Opt. 43, 4915-4921 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-25-4915


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References

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  23. A more detailed analysis of the experimental results (not developed in this paper) shows, for particular experimental conditions, an increase of the signal-to-noise ratio of the indirect LOFI modulation compared with the direct LOFI modulation. This study is currently in progress and is still unresolved.

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