Continuous laser beam steering with micro-optical arrays: experimental results

2008 ◽  
Author(s):  
J. Bourderionnet ◽  
M. Rungenhagen ◽  
D. Dolfi ◽  
H. D. Tholl
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Experimental Results ◽  
Continuous Laser

Control of a Flexible Continuum Manipulator for Laser Beam Steering

2021 ◽  
Vol 6 (2) ◽  
pp. 1074-1081
Author(s):  
Hangjie Mo ◽  
Ruofeng Wei ◽  
Bo Ouyang ◽  
Liuxi Xing ◽  
Yanhu Shan ◽  
...  
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Continuum Manipulator

Laser Beam Steering Along Three-Dimensional Paths

2018 ◽  
Vol 23 (3) ◽  
pp. 1148-1158 ◽  
Author(s):  
Brahim Tamadazte ◽  
Rupert Renevier ◽  
Jean-Antoine Seon ◽  
Andrey V. Kudryavtsev ◽  
Nicolas Andreff
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Three Dimensional

Optical GNSS Receiver for the ESA's NGGM-MAGIC Mission and for LEO Satellites with the Highest Orbit Accuracy

2021 ◽  
Author(s):  
Drazen Svehla
Keyword(s):  
Laser Beam ◽  
Gravity Field ◽  
Carrier Phase ◽  
Beam Steering ◽  
Precise Orbit Determination ◽  
Optical Carrier ◽  
Gnss Receiver ◽  
Cw Laser ◽  
Leo Satellites ◽  
Leo Satellite

<p>Precise orbit determination (POD) of LEO satellites is done with a geodetic grade GPS receiver measuring carrier-phase between a LEO and GPS satellites, and in some cases this is supported with a DORIS instrument measuring Doppler between LEO and ground DORIS stations. Over the last 20 years we have demonstrated 1-2 cm accurate LEO POD and about 1 mm for inter-satellite distance. In order to increase the accuracy of the single satellite POD or satellites in LEO formation we propose an “optical GNSS receiver”, a cw-laser on a LEO satellite to measure Doppler between a LEO and GNSS satellite(s) equipped with SLR arrays and to develop it for the next gravity field mission.      </p><p>The objective of the ESA mission NGGM-MAGIC (Next Generation Gravity Mission - Mass-change and Geosciences International Constellation) is the long-term monitoring of the temporal variations of Earth’s gravity field at high resolution in time (3 days) and space (100 km), complementing the GRACE-FO mission from NASA at 45° orbit inclination. Currently, the GRACE-type mission design is based on optical carrier-phase measurements between two LEO satellites flying in a formation and separated by 200 km.</p><p>We propose an extension of the GRACE-type LEO-LEO concept by the “optical GNSS receiver” to provide Doppler measurements between a LEO satellite and GNSS satellite(s) equipped with SLR corner cubes by means of a cw-laser onboard a LEO satellite. Such a “vertical” LEO-GNSS observable is missing in the classical GRACE-type LEO-LEO concept. If Doppler measurements are carried out from the two GRACE-type satellites in the LEO orbit to the same GNSS satellite and by forming single-differences to that GNSS satellite one can remove any GNSS-orbit related error in the measured LEO-GNSS Doppler. In this way, radial orbit difference can be obtained between the two GRACE-type satellites (free of all GNSS orbit errors) and complement “horizontal” LEO-LEO measurements between the two GRACE-type satellites in the LEO orbit.</p><p>The non-mechanical laser beam steering has been developed for an angle window of -40° to +40° and it does not require a rotating and a big telescope in LEO (no clouds and atmosphere turbulences in LEO). Therefore, in such a beam-steering window, one could always observe with a fiber cw-laser one GNSS satellite close to the zenith from both GRACE-type satellites. The non-mechanical beam steering concept in zenith direction can be supported by a small 10-cm like (fixed) Ritchey-Chrétien telescope (COTS), a Cassegrain reflector design widely used for LEO satellites, e.g., for James Webb Space Telescope or for an optical Earth imaging with Cubesats with the 50 cm resolution.</p><p>Considering that several GNSS satellites in the field of view could be observed from a LEO satellite with this approach (including LAGEOS-1/2 and Etalon satellites) and the non-mechanical laser beam steering could be extended towards the LEO horizon, an “optical” GNSS receiver is a new concept for POD of LEO satellites. Here, we provide simulations of this new concept for LEO POD with GNSS/SLR constellations equipped with SLR arrays and discuss all new applications this new concept could bring.</p>

Self-focusing of a continuous laser beam in KNbO3 in the presence of an externally applied electric field

2001 ◽  
Vol 18 (1) ◽  
pp. 187-190 ◽  
Author(s):  
C Hesse ◽  
N Fressengeas ◽  
D Wolfersberger ◽  
G Kugel
Keyword(s):  
Electric Field ◽  
Laser Beam ◽  
Applied Electric Field ◽  
Continuous Laser ◽  
Self Focusing

Ultra-Compact Laser Beam Steering Device Using Holographically Formed Two Dimensional Photonic Crystal

2010 ◽  
Vol 10 (3) ◽  
pp. 1650-1655
Author(s):  
Xinyuan Dou ◽  
Xiaonan Chen ◽  
Maggie Yihong Chen ◽  
Alan Xiaolong Wang ◽  
Wei Jiang ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Laser Beam ◽  
Beam Steering ◽  
Two Dimensional ◽  
Dimensional Photonic Crystal ◽  
Two Dimensional Photonic Crystal

Monolithic QW laser beam steering and wavelength tunability

2013 ◽  
Vol 46 (2) ◽  
pp. 331-336 ◽  
Author(s):  
Abdullah J. Zakariya ◽  
Patrick LiKamWa
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Wavelength Tunability
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