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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 13 — Jun. 21, 2010
  • pp: 13451–13467

Continuous adaptive beam pointing and tracking for laser power transmission

Christian A. Schäfer  »View Author Affiliations


Optics Express, Vol. 18, Issue 13, pp. 13451-13467 (2010)
http://dx.doi.org/10.1364/OE.18.013451


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Abstract

The adaptive beam pointing concept has been revisited for the purpose of controlled transmission of laser energy from an optical transmitter to a target. After illumination, a bidirectional link is established by a retro-reflector on the target and an amplifier-phase conjugate mirror (A-PCM) on the transmitter. By setting the retro-reflector’s aperture smaller than the diffraction limited spot size but big enough to provide sufficient amount of optical feedback, a stable link can be maintained and light that hits the retro-reflector’s surrounded area can simultaneously be reconverted into usable electric energy. The phase conjugate feedback ensures that amplifier’s distortions are compensated and the target tracked accurately. After deriving basic arithmetic expressions for the proposed system, a section is devoted for the motivation of free-space laser power transmission which is supposed to find varied applicability in space. As an example, power transmission from a satellite to the earth is described where recently proposed solar power generating structures on high-altitudes receive the power above the clouds to provide constant energy supply. In the experimental part, an A-PCM setup with reflectivity of about RA-PCM = 100 was realized using a semiconductor optical amplifier and a photorefractive self-pumped PCM. Simulation results show that a reflectivity of RA-PCM>1000 could be obtained by improving the self-pumped PCM’s efficiency. That would lead to a transmission efficiency of η>90%.

© 2010 OSA

OCIS Codes
(070.5040) Fourier optics and signal processing : Phase conjugation
(260.2160) Physical optics : Energy transfer
(230.4480) Optical devices : Optical amplifiers

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: March 26, 2010
Revised Manuscript: May 31, 2010
Manuscript Accepted: May 31, 2010
Published: June 8, 2010

Citation
Christian A. Schäfer, "Continuous adaptive beam pointing and tracking for laser power transmission," Opt. Express 18, 13451-13467 (2010)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-18-13-13451


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