Characterization of the holographic wavefront sensor for free-space optical communications | Zendy

Andreas Zepp | Zendy

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Characterization of the holographic wavefront sensor for free-space optical communications

Author(s) -

Andreas Zepp

Publication year - 2013

Publication title -

proceedings of spie, the international society for optical engineering/proceedings of spie

Language(s) - English

Resource type - Conference proceedings

SCImago Journal Rank - 0.192

H-Index - 176

eISSN - 1996-756X

pISSN - 0277-786X

DOI - 10.1117/12.2028999

Subject(s) - holography , free space optical communication , wavefront , computer science , free space , characterization (materials science) , optics , adaptive optics , telecommunications , optical communication , physics

We are studying the effectiveness of HWFS for measuring the first few low-order aberrations. In literature a value of 10%Strehl ratio has been assumed as a threshold of usefulness of adaptive-optics correction for laser communications. We want to check whether such a value can be achieved through the use of HWFS for compensation of laser beams over long horizontal paths. We realized HWFS by recording an analog multiplex hologram. We analyzed the sensor’s response to incoming laser beams with defined wavefront aberrations. The test wavefronts were aberrated with the deformable mirror DM-52-15 by ALPAO. We studied the influence of tip/tilt on the senor’s accuracy. The effect of a tilted laser beam on HWFS is an unsymmetrical misalignment of the reconstructed spots. In this case the use of small photodiodes for intensity measurement- a configuration recommended for tip/tilt-free beam – can lead to error-prone measurements

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