SPIE 2002 Adaptive Optics Summary

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SPIE 2002Adaptive Optics Summary

• Richard Myers

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The AO Conferences

• AO System Technologies IIConference 4839Thu 22
  Aug Mon 26 Aug
• Monday 26 Aug included a Joint Session
  withFuture Giant Telescopes Conference 4840
• Also Interesting High-Contrast Imaging of
  Extra-Solar PlanetsConference 4860

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ContentsRe-ordered by topic

• System Highlights
• ESO
• Keck
• Subaru
• Unisis (Mt. Wilson)
• Gemini
• MMT
• LBT
• Tenerife (Solar)
• SOAR

• Misc. Highlights
• Ribak
• Bonaccini
• Tyler
• Reconstructors
• Palomar (C67)
• SOR (FPGA)
• FFT
• Hierarchical

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4839-01 HubinAdaptive Optics Projects at ESO

• Current Projects
• NAOS installed, to be offered from Oct 03
• 4 x MACAO VLTI (interferometer) AO feeds
• SINFONI IR Spectrograph with AO
• MAD Lab/VLT MultiConjugate AO demonstrator
• CRIRES Echelle
• RTN-AO-ELT
• Details

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4839-01 Hubin

• NAOS-CONICA
• Nasymth, Rotating so stringent flexure
  requirements
• V17, SR17 at K

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4839-01 Hubin

• MACAO-VLTI
• 60 element curvature sensor
• Bimorph on tip-tilt mount
• Specification for Strehl ratio (K-band)
• gt0.5 Vlt10
• gt0.35 Vlt14.5
• gt0.25 Vlt15.5

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4839-01 Hubin

• SINFONI
• Instrument SPIFFI
• 0.9-2.5 micron 3D Spectrograph
• AO
• 60 element Curvature Sensor
• Due 2004
• NGS/LGS capability

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4839-01 Hubin

• MAD
• (OWL goal 60k x 60k spatial resolution AO)
• Performance evaluation in near IR for
• Multi-Conjugate AO (Brent Ellerbroek)
• Layer-Oriented AO (Roberto Ragazzoni)
• Nasmyth focus of VLT (and lab)
• 2 DMs Marchetti et al
• Pupil 60 act
• 9km 60 act
• MCAO WFS
• 3 moveable Shack-Hartmann
• Layer Oriented
• Up to 8 pyramids Farinato et al

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4839-01 Hubin

• RTN
• Research and Training Network
• Poster Conan et al
• Outer scale effects on OWL

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4839-17 RoussetNAOS 1st AO system on VLT on-sky
performance

• 2 x SH WFS, (1 field selector), each
• 14 x 14 (144 subap)
• 7 x 7 (36 subap)
• 128 x 128 x 16 EEV CCD
• (48 configurations altogether)
• Shakti RTCS
• 0dB 27Hz
• Dichroic wheel
• 2 neutral and 3 dichroic
• DM 185 actuator CILAS
• NAOS on UT4
• Some tel. Vibrations, tip-tilt and higher, 10 SR
  loss
• Differential aberrations in CONICA and BS
  Harting et al
• Vmag 17.6, gain of 7 in SR 0.8 seeing)
• Astronomical results Lagrange et al

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4839-21 ArsenaultAO system for ESO VLTI MACAO

• Curvature-based system
• RTC PowerPC
• Need to have no differential piston between AO
  systems as this would be too fast to correct with
  delay line
• 8th mirror of Coude train is replaced by adaptive
  mirror
• 2 x lenslets in CS system
• 1st system on-sky end 2002
• July 2003 2 systems at VLT
• Can get fringes

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4839-39 StrobeleImplementation of MACAO for
SINFONI

• Cass
• SPIFFI
• 32 x 32 element slicer
• FOV 0.8 x 0.8 -gt 8 x 8
• R 3300 in J,H,K
• LGS mode

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4839-38 MarchettiMAD the ESO MCAO demo

• 3 bright NGS, V 10-12, global reconstruction
• ESO TCCD controller
• 2 x DMS
• Pupil high alt.
• MACAO type 60 actuator bimorphs
• RTC 4 x G4 PowerPC
• Science camera 2k x 2k, 1 FOV
• MAPS multi-layer turbulence generator
• 1st light on VLT Jan 2004

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4839-? ViardLayer-oriented WFS for MAD

• Tests at Garching start next year
• Test phase at VLT Jan 2004

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4839-67 VerinaudComparison of different 3D
sensing and reconstruction techniques for MCAO

• Global layer-oriented considers cross-terms
• Use MAP reconstructor with global (always best)
• There IS optical coupling
• Considers FOV for NGS-only MCAO (14 mag GSs for
  MFoV LO MCAO)
• Ground layer 8 10 NGS
• High layer 12-14 NGS
• Pupil overlap is small but improves for ELTs

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4839-71 FarinatoLayer-oriented AO from drawings
to metal

• Lab emulator
• 4 x pyramid WFS
• Open loop only
• Static plastic plates for seeing
• Look at perturbation of conjugated layer
  measurements by non-conjugated layers
• blurring effect

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4839-44 BonacciniVLT LGS facility

• 10W solid state fibre laser CW
• PARSEC
• M2 lt 1.3 (goal 1.2)
• gt 10 W CW (15W goal)
• 589nm D2
• 10MHz line width
• Photonic crystal relay fibre
• Dec 2003 commission with NAOS
• 4839-45 Rabien 8W launched to sky

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4839-46 PenningtonCompact fibre laser approach
to generating 589nm LGS

• CW up to 110W have been developed
• New high efficiency non-linear materials can be
  used extra-cavity
• Frequencies
• 1538nm Er/Yb 10 W demonstrated
• Nd 938nm NdFA more complicated
• Competing ASE at 1088nm
• Got rid of by using low NA fibre core (high NA
  clad) bend losses depressed index core
• ground state absorption at 938nm
• Got rid of by cooling cooling
• Goal 10W linearly polarised
• 2.2W achieved!
• Sum frequency periodically-poled crystals eg.
  PPKTP, PPLN(iobate)

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4839-02 WizinowichAO developments at Keck Obs

• Instruments
• NIRC2 fixed
• Deployable on rails
• NIRSPEC
• OSIRIS
• Dual star module
• From 2000 18 total refereed papers
• Tracking limit V13-14
• Io video 75mas 80 SR
• Interferometer peak V2 75-80
• Keck LGS WFS
• Get centroid offsets and focus from 2min
  integration on NGS WFS with same lenslet patters
  as LGS and 8x8 pix/subap (very faint op)

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4839-03 TakemiPerformance of Subaru AO system

• 36 element bimorph 36 element CS with APDs
• Separate tip-tilt mirror
• Instruments
• IRCS IR imager/Spect
• CIAO Coron 1k x 1k InSB, 11-22 mas/pix
• LGS upgrade just funded 3-4yrs

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4839-04 HayanoUpgrade plans for the Subaru AO
system

• 200 elem bimorph 200 APDs
• 4W CW LGS
• NGS-AO 2004
• LGS-AO 2005
• Fibre relay to launch telescope behind M2
• Predict 10mag LGS

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4839-05 Laird ThompsonUnisis AO system _at_ Mt
Wilson 2.5m

• Coude
• 18km LGS focus
• FA d0 6.5m at 2 microns, 2.8m at 1 micron
• 177 actuator Xinetics DM
• XeF laser 32 W full power, 100mJ/shot
• Pockels cell 33 throughput with both
  polarisation states used
• 100mJ pulse -gt 45-60 photoelectrons (4e- read
  noise)
• Closed loop expected soon

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4839-06 HerriottAltair Gemini-North AO

• 1st light Oct
• Invisible mode subtractor
• Monitor actuator signals
• Dot product with 20 invisible modes
• Subtract
• Use a leaky box with same BW as reconstructor
• Quadcell offset corrector
• Varies with seeing
• Monitors variation of DM cmds around static astig.

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4839-07 EllerbroekMCAO for Gemini-South

• RT Latency 100 microsec based on G4 processor
• CTI 10W for Gemini-North contract signed
• (SOR want 50W CW)

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4839-116 EllerbroekComputationally efficient
wavefront reconstructor for simulations of
multiconjugate AO on giant telescope

• JOSA-A special on reconstructor matrix inversion

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4839-19 Wildi1st light of 6.5m MMT AO Sys with
DM2

• 336 voice coil actuators
• 168 DSPs with feed-forward loop
• 12x12 SH

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4839-54 GeorgesField tests of dynamic refocus

• Steward have 5W tripled NdYLF
• Using dynamic refocussing to extend range gate
  depth.

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4839-69 Lloyd-HartDesign and expected
performance of MMT MCAO

• 2 x conjugate
• Conjugate of 2nd DM can move in pseudo-collimator
• DM2 250 actuator
• 5 Rayleigh LGSs with double range gate
• 5 x 5W lasers, dynamic refocussing
• 5 x 12 x 12 SH WFS LGS 25-35km
• 5 x 3 x 3 SH WFS 35-40km
• 1 NGS tip-tilt only
• 3 year project

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4839-20 Esposito1st light AO system for LBT

• ASM 672 actuators
• Instrument LUCIFER IR/Spect
• 30 x 30 pupil sampling pyramid WFS
• Bundle to 15 x 15 10 x 10
• Deep-depletion EEV CCD-39
• CCD-60 Foppiani poster
• Schedule
• Lab test 4Q 2002
• Tower test 2003-4
• Sky 2Q 2004

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4839-65 RagazzoniA visible MCAO channel for
NIRVANA on LBT

• Fizeau interferometer
• MCAO on each channel (MFoV layer-oriented)
• 6 FOV for ground layer
• 2 FOV for science field
• 22.4m baseline
• L3CCD or TI (!)
• M2 adaptive, 712 actuators, Ground layer
• 3000 dof for actuation
• Some separation into blocks thanks to
  Layer-Oriented AO
• Goal instrument in lab, late 2005

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4839-66 BerkenfeldMCAO on German solar telescope
on Tenerife

• 2 x DMs
• Bimorph (original)
• OKO membrane (new)
• Sky 1Q 2003

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4839-79 TokovininConcept for a visible light AO
system for the 4.2m SOAR telescope

• Ground-layer AO
• Use 4 NGS to correct only ground-layer (!)

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4839 Ribak (Extra)Variable pitch Shack-Hartmann
WFS

• Look at near-field of acousto-optic driver
• Change frequency to change pitch of lenslet array

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4839-70 BonacciniMCAO with LGS more on the field

• Parallel projection
• 4 bucket shearing interferometry

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4839-108 Tyler

• Simulated speckle blaster using SLM

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4839-? ? (Palomar)

• Using Pentek 4 x 6701 processor board. 2 kHz
  update for 341 actuators
• Planning on 1600 actuators

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4839-111 ? (SOR)

• Using Altera FPGA as 5kHz gradient processor
• Latency less that 3 microsecs

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4839-120 Poyneer

• FFT reconstruction
• Favours Hudgin

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4839-119 Shi

• Hierarchical reconstruction