Abstract
The GMT will be a 25.4-meter telescope consisting of 7 primary and secondary mirror segments that must be phased to within a fraction of an imaging wavelength in order to achieve diffraction limited performance. The need to use off-axis guide stars, coupled with the large (350 mm) segment gaps, makes the task of phasing the GMT uniquely challenging. To meet these requirements, the Acquisition, Guiding, and Wavefront Sensing system (AGWS) will use four J-band dispersed fringe sensors (DFS) to measure segment piston at each segment boundary. This DFS will use a novel array of doublet prisms, instead of grisms, to disperse segment boundary fringes with maximal throughput, minimal stray light, and no spurious diffractive orders. The DFS will also use a low noise SAPHIRA e-APD array reading out at ~100 Hz in order to freeze atmospheric turbulence in the segment boundary fringe images. We will test a prototype of this DFS on the Magellan Clay 6.5 meter telescope using an adaptive optics corrected beam from the MagAO system. We present the design of the next generation phasing prototype.
| Original language | English (US) |
|---|---|
| State | Published - Jan 1 2017 |
| Event | 5th Adaptive Optics for Extremely Large Telescopes, AO4ELT 2017 - Tenerife, Canary Islands, Spain Duration: Jun 25 2017 → Jun 30 2017 |
Other
| Other | 5th Adaptive Optics for Extremely Large Telescopes, AO4ELT 2017 |
|---|---|
| Country | Spain |
| City | Tenerife, Canary Islands |
| Period | 6/25/17 → 6/30/17 |
Fingerprint
Keywords
- Active optics
- Adaptive optics
- Dispersed fringe sensor
- Giant magellan telescope
- Phasing
ASJC Scopus subject areas
- Space and Planetary Science
- Mechanical Engineering
- Control and Systems Engineering
- Instrumentation
- Astronomy and Astrophysics
- Electronic, Optical and Magnetic Materials
Cite this
Phasing the GMT with a next generation e-APD dispersed fringe sensor : Design and on-sky prototyping. / Kopon, Derek; McLeod, Brian; Bouchez, Antonin; Catropa, Daniel; Van Dam, Marcos A.; McCracken, Ken; McMuldroch, Stuart; Podgorski, William; D'Arco, Joseph; Close, Laird M; Males, Jared; Morzinski, Katie.
2017. Paper presented at 5th Adaptive Optics for Extremely Large Telescopes, AO4ELT 2017, Tenerife, Canary Islands, Spain.Research output: Contribution to conference › Paper
}
TY - CONF
T1 - Phasing the GMT with a next generation e-APD dispersed fringe sensor
T2 - Design and on-sky prototyping
AU - Kopon, Derek
AU - McLeod, Brian
AU - Bouchez, Antonin
AU - Catropa, Daniel
AU - Van Dam, Marcos A.
AU - McCracken, Ken
AU - McMuldroch, Stuart
AU - Podgorski, William
AU - D'Arco, Joseph
AU - Close, Laird M
AU - Males, Jared
AU - Morzinski, Katie
PY - 2017/1/1
Y1 - 2017/1/1
N2 - The GMT will be a 25.4-meter telescope consisting of 7 primary and secondary mirror segments that must be phased to within a fraction of an imaging wavelength in order to achieve diffraction limited performance. The need to use off-axis guide stars, coupled with the large (350 mm) segment gaps, makes the task of phasing the GMT uniquely challenging. To meet these requirements, the Acquisition, Guiding, and Wavefront Sensing system (AGWS) will use four J-band dispersed fringe sensors (DFS) to measure segment piston at each segment boundary. This DFS will use a novel array of doublet prisms, instead of grisms, to disperse segment boundary fringes with maximal throughput, minimal stray light, and no spurious diffractive orders. The DFS will also use a low noise SAPHIRA e-APD array reading out at ~100 Hz in order to freeze atmospheric turbulence in the segment boundary fringe images. We will test a prototype of this DFS on the Magellan Clay 6.5 meter telescope using an adaptive optics corrected beam from the MagAO system. We present the design of the next generation phasing prototype.
AB - The GMT will be a 25.4-meter telescope consisting of 7 primary and secondary mirror segments that must be phased to within a fraction of an imaging wavelength in order to achieve diffraction limited performance. The need to use off-axis guide stars, coupled with the large (350 mm) segment gaps, makes the task of phasing the GMT uniquely challenging. To meet these requirements, the Acquisition, Guiding, and Wavefront Sensing system (AGWS) will use four J-band dispersed fringe sensors (DFS) to measure segment piston at each segment boundary. This DFS will use a novel array of doublet prisms, instead of grisms, to disperse segment boundary fringes with maximal throughput, minimal stray light, and no spurious diffractive orders. The DFS will also use a low noise SAPHIRA e-APD array reading out at ~100 Hz in order to freeze atmospheric turbulence in the segment boundary fringe images. We will test a prototype of this DFS on the Magellan Clay 6.5 meter telescope using an adaptive optics corrected beam from the MagAO system. We present the design of the next generation phasing prototype.
KW - Active optics
KW - Adaptive optics
KW - Dispersed fringe sensor
KW - Giant magellan telescope
KW - Phasing
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UR - http://www.scopus.com/inward/citedby.url?scp=85049317310&partnerID=8YFLogxK
M3 - Paper
ER -