Zobrazeno 1 - 10
of 49
pro vyhledávání: '"Geoff Andersen"'
Publikováno v:
SPIE Proceedings.
Photon sieves for generating and identifying beams with orbital angular momentum are presented. They are diffractive optical elements (DOEs) based on a traditional Fresnel zone plate (FZP), but composed of a series of microscopic pinholes usually cen
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6e4e96548630d407a6359c41463513c1
https://doi.org/10.1117/12.2249626
https://doi.org/10.1117/12.2249626
Publikováno v:
SPIE Proceedings.
The US Air Force Academy of Physics has built FalconSAT-7, a membrane solar telescope to be deployed from a 3U CubeSat in LEO. The primary optic is a 0.2m photon sieve – a diffractive element consisting of billions of tiny circular dimples etched i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b6f9217b103087d6a8a4f69fb187c9ef
https://doi.org/10.1117/12.2229711
https://doi.org/10.1117/12.2229711
Autor:
Geoff Andersen
Publikováno v:
Imaging and Applied Optics 2016.
We present details of a compact, holographic adaptive optics system with 64 actuators and 100kHz bandwidth, but no computer. We are currently modifying our system with a view towards an on-sky test in a large astronomical telescope in late-2016.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8b32ed1fdb8f4cb36130838d0a165a57
https://doi.org/10.1364/aoms.2016.aom4c.3
https://doi.org/10.1364/aoms.2016.aom4c.3
Autor:
Thomas Dickinson, Geoff Andersen, Matthew G. McHarg, Carlos A. Maldonado, Olha Asmolova, Trey Quiller
Publikováno v:
SPIE Proceedings.
FalconSAT-7 (FS-7), a 3U CubeSat solar telescope, is the first-ever on-orbit demonstration of a lightweight deployable membrane primary optic that is twice the size of the host spacecraft. The telescope payload consists of the deployment structure, o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7c6af8dc688cbd12877452b3dad040c6
https://doi.org/10.1117/12.2189918
https://doi.org/10.1117/12.2189918
Publikováno v:
SPIE Proceedings.
We present progress on our holographic adaptive laser optics system (HALOS): a compact, closed-loop aberration correction system that uses a multiplexed hologram to deconvolve the phase aberrations in an input beam. The wavefront characterization is
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::56594b4949bf33d1e67406cf09a5ebb4
https://doi.org/10.1117/12.2054444
https://doi.org/10.1117/12.2054444
Publikováno v:
Laser Technology for Defense and Security X.
We present a new method to lock an unlimited number of lasers using a simple, inexpensive hologram and photodiodes. Multiple fiber laser inputs are sent through a fiber shifters and then onto two holographic optical elements that split each beam in t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7de4158c10cf1304c9604d6a8f89a97c
https://doi.org/10.1117/12.2050601
https://doi.org/10.1117/12.2050601
Publikováno v:
SPIE Proceedings.
The USAF Academy Department of Physics has built FalconSAT-7, a membrane solar telescope to be deployed from a 3U CubeSat in LEO. The primary optic is a 0.2m photon sieve - a diffractive element consisting of billions of tiny circular dimples etched
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7fad03714daf60835b5707cb741b80b5
https://doi.org/10.1117/12.2050545
https://doi.org/10.1117/12.2050545
Publikováno v:
SPIE Proceedings.
We present an adaptive optics system which uses a multiplexed hologram to deconvolve the phase aberrations in an input beam. The wavefront characterization is extremely fast as it is based on simple measurements of the intensity of focal spots and do
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ec8d1d6d2465d6e1d2c00f811cd3aba6
https://doi.org/10.1117/12.2050565
https://doi.org/10.1117/12.2050565
Publikováno v:
Optics express. 22(8)
We present a closed-loop adaptive optics system based on a holographic sensing method. The system uses a multiplexed holographic recording of the response functions of each actuator in a deformable mirror. By comparing the output intensity measured i
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8538e3650ca3aa976f0c0cd34fb5ae70
https://pubmed.ncbi.nlm.nih.gov/24787832
https://pubmed.ncbi.nlm.nih.gov/24787832
Autor:
Trey Quiller, Thomas Dickinson, Matthew G. McHarg, Geoff Andersen, Michael E. Dearborn, Olha Asmolova
Publikováno v:
Practical Holography XXVIII: Materials and Applications.
We describe imaging capabilities of a 0.2 m membrane diffractive primary (DOE) used as a key element in FalconSat-7, a space-based solar telescope. Its mission is to take an image of the Sun at the H-alpha wavelength (656nm) over a narrow bandwidth w
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7a9deb06573e81a9343b2f6fc9b1ebe7
https://doi.org/10.1117/12.2037035
https://doi.org/10.1117/12.2037035