Experimental demonstration of an optical phased array antenna for laser space communications

Neubert, Wolfgang M.; Kudielka, K.; Leeb, Walter R.; Scholtz, Arpad L.

doi:10.1364/ao.33.003820

Cited by 47 publications

(12 citation statements)

References 11 publications

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“…Expression (1) shows that the far field of the total beam is a product of interference of the far fields of the partial beams. Obviously, the result of the interference is determined by the relative phase shifts between the individual channels (ϕ nm ) and coaxiality of the partial beam propagation (J (nm)…”

Section: Effect Of Sub-aperture Restrictions and Phase Mismatchmentioning

confidence: 99%

Multiple-channel laser with phase conjugation in dynamically coupled cavities

Khizhnyak

Markov

2004

SPIE Proceedings

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Section: Effect Of Sub-aperture Restrictions and Phase Mismatchmentioning

confidence: 99%

Multiple-channel laser with phase conjugation in dynamically coupled cavities

Khizhnyak

Markov

2004

SPIE Proceedings

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“…The coherent laser array (CLA) has attracted much attention from researchers because of its wide applications, including coherent beam combination (CBC) [1,2], optical phased array antenna (OPAA) [3][4][5], and beam shaping. As an important method for power or brightness scaling, the CBC is usually used in cases where a high-power or high-brightness laser with good beam quality is needed.…”

Section: Introductionmentioning

confidence: 99%

“…When all pistons of beams are phase-locked to 0 or 2π and tilts of beams are effectively eliminated, each beam contributes coherently to the overall far-field intensity, so the brightness in the far-field is magnified. The OPAA is applied in the signal transmitting and receiving in lidar [4] and laser space communication [3]. If the phase distributions of the CLA are controlled following some rules [4], the far-field pattern could shift to the target locations on the far-field plane.…”

Section: Introductionmentioning

confidence: 99%

“…The OPAA is applied in the signal transmitting and receiving in lidar [4] and laser space communication [3]. If the phase distributions of the CLA are controlled following some rules [4], the far-field pattern could shift to the target locations on the far-field plane. This inertiafree beam steering technology could be used in OPAA to accomplish the two-dimensional steering more rapidly and precisely compared to the traditional mechanical steering.…”

Section: Introductionmentioning

confidence: 99%

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Theoretical analysis of tuning coherent laser array for several applications

et al. 2012

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Theoretical analysis for the far-field diffraction of the coherent laser array (CLA) is presented. Based on the theoretical model of the propagation of CLA, the conditions and restrictions for coherent beam combination, two-dimensional steering, and dark-hollow beam generation are theoretically described in detail. With properly organized phase distributions and tilt control, the peak location of the far-field pattern of the CLA could shift two-dimensionally in a large scale of steering angle. With additional amplitude modulation, the far-field pattern could have special shapes. The simulated results agree with the theoretical analysis. It is a feasible way to realize all these applications by a CLA with well-arranged phase distributions and/or additional amplitude modulation.

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“…This technique brings additional functionalities such as beam deflection and beam shaping. This can be useful to correct a wavefront distorted by a passage through atmosphere, or to point a receiver in free space communication, for instance [16][17] [18] and techniques based on SBS phase conjugation mirror has also been proposed for compensation of phase errors [19].…”

Section: Introductionmentioning

confidence: 99%

Coherent fiber combining by digital holography

et al. 2009

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Fiber lasers provide an attractive means of reaching high output laser power because of their advantages in terms of compactness, reliability, efficiency and beam quality. In order to obtain much higher output power than it is possible from a single fiber, beam-combining techniques have been investigated. In this communication, we present a new technique of coherent fiber combining, based on self adaptive digital holography that does not require any phase error measurement. A low power plane reference beam is first launched into the fiber amplifier array. The interference pattern between the beams with phase φ (x,y) issued from the fiber array and a plane reference beam is recorded on a digital camera and directly transferred to a Spatial Light Modulator (SLM) which acts as a programmable digital hologram. This hologram is read out simultaneously and a phase conjugate beam with phase -φ (x,y) is generated in order -1 of the diffraction pattern. This beam is then injected in the fiber amplifier array. At the output of the fiber amplifier array, the phase of each elementary beam are locked. Experimental demonstration of coherent beam combining by digital holography is demonstrated with polarization maintaining fibers operating at 1µm. Digital holography is realized thanks to a CCD/CMOS camera and a liquid crystal SLM. Owing to the high resolution of existing SLMs and cameras, this technique could be applied to phase lock a large number of fiber amplifiers.

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Experimental demonstration of an optical phased array antenna for laser space communications

Cited by 47 publications

References 11 publications

Multiple-channel laser with phase conjugation in dynamically coupled cavities

Multiple-channel laser with phase conjugation in dynamically coupled cavities

Theoretical analysis of tuning coherent laser array for several applications

Coherent fiber combining by digital holography

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