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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 4 — Apr. 1, 2012
  • pp: 646–649

Actively stabilized wavelength-insensitive carrier elimination from an electro-optically modulated laser beam

Nathan Cooper, James Bateman, Alexander Dunning, and Tim Freegarde  »View Author Affiliations


JOSA B, Vol. 29, Issue 4, pp. 646-649 (2012)
http://dx.doi.org/10.1364/JOSAB.29.000646


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Abstract

We demonstrate a simple and robust technique for removal of the carrier wave from a phase-modulated laser beam, using a noninterferometric method that is insensitive to the modulation frequency and instead exploits the polarization dependence of electro-optic modulation. An actively stabilized system using feedback via a liquid crystal cell yields long-term carrier suppression in excess of 28 dB at the expense of a 6.5 dB reduction in sideband power.

© 2012 Optical Society of America

OCIS Codes
(020.2930) Atomic and molecular physics : Hyperfine structure
(230.5440) Optical devices : Polarization-selective devices
(140.3425) Lasers and laser optics : Laser stabilization

ToC Category:
Lasers and Laser Optics

History
Original Manuscript: August 26, 2011
Revised Manuscript: December 16, 2011
Manuscript Accepted: December 16, 2011
Published: March 16, 2012

Citation
Nathan Cooper, James Bateman, Alexander Dunning, and Tim Freegarde, "Actively stabilized wavelength-insensitive carrier elimination from an electro-optically modulated laser beam," J. Opt. Soc. Am. B 29, 646-649 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-4-646


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References

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  10. In our case, for example, New Focus Model 4431 employing MgO:LiNbO3.
  11. The maximum modulation depth achievable with most commercial EOMs is of the order of 1 radian.
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  13. We now see that any phase relationship between the horizontally and vertically polarized components of the input light can be subsumed into this phase difference; hence our calculations are valid for any input polarization.
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  19. This was implemented using an Atmel ATMEGA328P-PU microprocessor (mounted on an Arduino Uno board) and Analog Devices DAC8562 12 bit digital-to-analog converter.
  20. The long-term carrier suppression was slightly reduced by small variations in the modulation depth; with the enhancement of Section 4, we expect that performance would be limited by the polarizing beam splitters.

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