Laser propagation through turbulence over land and sea (Invited Paper)

Steinvall, Ove; Bolander, G.; Sjöqvist, Lars; Petersson, Mikael; Gustafsson, Ove; Berglund, Folke; Allard, Lars; Karlsson, K.; Larsson, Tomas; Gustavsson, Frank

doi:10.1117/12.603514

Cited by 6 publications

(4 citation statements)

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“…From an active imaging point of view such parameters a beam and image jitter, scintillation and other coherence effects are of interest. Example of such measurements 20,21,22,23 is found in ref. [20][21][22][23].…”

Section: Supporting Measurementsmentioning

confidence: 98%

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Overview of range gated imaging at FOI

et al. 2007

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Section: Supporting Measurementsmentioning

confidence: 98%

“…Example of such measurements 20,21,22,23 is found in ref. [20][21][22][23]. The atmospheric effects are discussed more in another paper in this session 24 .…”

Section: Supporting Measurementsmentioning

confidence: 98%

Overview of range gated imaging at FOI

et al. 2007

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“…Large bandwidth fine tracking units are successfully used to achieve the tip/tilt correction of the beam wander effect. After a propagation distance of 16.7 km above sea, a typical RMS beam jitter of ±100 µrad has been measured [2]. The compensation of atmospheric turbulence induced variations of the laser beam direction inside the receiver telescope is also the first step to establish a sophisticated adaptive optical system.…”

Section: Introductionmentioning

confidence: 99%

Atmospheric tip/tilt compensation for laser beam tracking with amateur telescopes

Buske

Riede

2009

Technologies for Optical Countermeasures VI

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We present a rugged and reliable real-time beam stabilization system which is adapted on a mobile 10" amateur Schmidt-Cassegrain telescope (SCT) to demonstrate the functionality on different ground locations. Recently, the tip/tilt system was tested in horizontal direction on a 130 m free space propagation range. Tip/tilt compensation with a rootmean-squared accuracy better than 0.5 µrad has been confirmed. All system characteristics were measured in relation to metrological conditions and turbulence strength.

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“…An optimum ratio of the beam sizes to the RMS (root-mean-squared) beam jitter can be estimated to be in the range of 1 -3, depending of the weather conditions [1]. After a propagation distance of 16.7 km above sea, a typical RMS beam jitter of ±100 µrad has been measured [2].…”

Section: Introductionmentioning

confidence: 99%

A real-time sub-μrad laser beam tracking system

2007

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We present a rugged and reliable real-time laser beam tracking system operating with a high speed, high resolution piezo-electric tip/tilt mirror. Characteristics of the piezo mirror and position sensor are investigated. An industrial programmable automation controller is used to develop a real-time digital PID controller. The controller provides a one million field programmable gate array (FPGA) to realize a high closed-loop frequency of 50 kHz. Beam tracking with a root-mean-squared accuracy better than 0.15 µrad has been laboratory confirmed. The system is intended as an add-on module for established mechanical mrad tracking systems.

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Laser propagation through turbulence over land and sea (Invited Paper)

Cited by 6 publications

References 0 publications

Overview of range gated imaging at FOI

Overview of range gated imaging at FOI

Atmospheric tip/tilt compensation for laser beam tracking with amateur telescopes

A real-time sub-μrad laser beam tracking system

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