Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Stephen L. Browne"'
Publikováno v:
Scopus-Elsevier
The study of the temporal performance of a nematic liquid crystal phase modulator with 69 phase retardance cells is presented. The change of Strehl ratio for defocus under static and dynamic conditions is discussed. It is observed that the rate of ar
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::65adf7182f18f0d289d638fc63e68287
https://doi.org/10.1016/s0030-4018(97)00256-3
https://doi.org/10.1016/s0030-4018(97)00256-3
Autor:
Scott McDermott, Joe Gallegos, David Charles Dayton, Sergio R. Restaino, Jeff Baker, John D. Gonglewski, Stephen L. Browne, Sam Rogers, Mike Shilko
Publikováno v:
Optics express. 6(1)
The use of liquid crystal devices for wavefront control has been suggested and implemented by several authors. In this paper we report some preliminary results on the use of Nematic based liquid crystal devices. Several experimental efforts have been
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ec4738ab1c7c506c3ea6a064064c05c
https://pubmed.ncbi.nlm.nih.gov/19401740
https://pubmed.ncbi.nlm.nih.gov/19401740
Autor:
Scott McDermott, Stephen L. Browne, John D. Gonglewski, David Charles Dayton, Steve Sandven, Sam Rogers
Publikováno v:
Optics express. 1(11)
Multi-segment liquid crystal spatial light modulators have received much attention recently for use as high-precision wavefront control devices for use in astronomical and non-astronomical applications. They act much like piston only segmented deform
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::83238c399aa40c58a3883295c1d110a1
https://pubmed.ncbi.nlm.nih.gov/19377554
https://pubmed.ncbi.nlm.nih.gov/19377554
Publikováno v:
SPIE Proceedings.
Multi-segment liquid crystal phased arrays have been demonstrated as adaptive optics elements for correction of atmospheric turbulence. High speed dual-frequency nematic liquid crystal has sufficient bandwidth to keep up with moderate atmospheric Gre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a5fff83e95cb9ab30b4985335f89f627
https://doi.org/10.1117/12.681655
https://doi.org/10.1117/12.681655
Publikováno v:
SPIE Proceedings.
In previous work we demonstrated a nematic liquid crystal MEMS adaptive optics system for observation of low earth orbit satellites. However the closed loop bandwidth was limited to 40 Hz due to latency in the interface electronics between the contro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b684b48385e6dcb39c4903e9ee37f645
https://doi.org/10.1117/12.565876
https://doi.org/10.1117/12.565876
Publikováno v:
Advancements in Adaptive Optics.
We present here results using two novel adaptive optic elements, an electro-static membrane mirror built by OKO Technologies, and a dual frequency multi-segment nematic liquid crystal built by Meadowlark Optics. These devices have the advantage of lo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0ff9f554a859acf77e8c409b7d8e1c57
https://doi.org/10.1117/12.547166
https://doi.org/10.1117/12.547166
Publikováno v:
SPIE Proceedings.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::aeef8eb92238c9e81cff4df14984e389
https://doi.org/10.1117/12.479631
https://doi.org/10.1117/12.479631
Publikováno v:
SPIE Proceedings.
We present here results using two novel active optic elements, an electro-static membrane mirror, and a dual frequency nematic liquid crystal. These devices have the advantage of low cost, low power consumption, and compact size. Possible application
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::16fa9a9838a1f64225cc3ab894c9ba64
https://doi.org/10.1117/12.457851
https://doi.org/10.1117/12.457851
Autor:
Jeffrey T. Baker, Stephen L. Browne, David Charles Dayton, Sergio R. Restaino, Deborah Werling
Publikováno v:
Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing.
The idea of using liquid crystal as adaptive optics components has been proposed by several authors. In recent years a vigorous research effort has been carried out, and it si still flourishing, in several countries. Mainly the research and experimen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e2d085b688da70d97412b94ec0af6cee
https://doi.org/10.1117/12.413818
https://doi.org/10.1117/12.413818
Autor:
Stephen L. Browne, John D. Gonglewski, Michael L. Shilko, David Charles Dayton, Steven C. Sandven, Joe Gallegos
Publikováno v:
Atmospheric Propagation, Adaptive Systems, and Laser Radar Technology for Remote Sensing.
We demonstrate the utility of laser illuminated imaging for clandestine night time surveillance from a simulated airborne platform at standoff ranges in excess 20 km. In order to reduce the necessary laser per pulse energy required for illumination a
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f4b35b1646d60521cef8ba3331bc9c95
https://doi.org/10.1117/12.413813
https://doi.org/10.1117/12.413813