LTHM 1 Large Telescope Using Holographically- Corrected Membrane Mirror L’Garde, Inc. NASA Institute for Advanced Concepts Large Telescope Using a Holographically-Corrected Membrane Mirror (LTHM) Arthur L. Palisoc L’Garde, Inc. Tustin, California June 6 - 7, 2000
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LTHM1
Large Telescope Using Holographically-Corrected Membrane Mirror
L’Garde, Inc.
NASA Institute for Advanced Concepts
Large Telescope Using a Holographically-CorrectedMembrane Mirror
(LTHM)
Arthur L. Palisoc
L’Garde, Inc.
Tustin, California
June 6 - 7, 2000
LTHM2
Large Telescope Using Holographically-CorrectedMembrane Mirror
L’Garde, Inc.
Objective of the LTHM Program:
To demonstrate the feasibility and address thesystem issues of a holographically-corrected large aperturemembrane telescope in the optical wavelengths.
LTHM3
L’Garde, Inc.
Large Telescope Using Holographically-CorrectedMembrane Mirror
Inflatable Antenna Experiment
LTHM4
L’Garde, Inc.
Large Telescope Using Holographically-CorrectedMembrane Mirror
Membrane Mirrors
3 m diameter HAIRreflector (on-axis)
1/5th sector of the IAE reflector (off-axis)
LTHM5
Large Telescope Using Holographically-CorrectedMembrane Mirror
Large Telescope Using Holographically-Corrected Membrane Mirror
L’Garde, Inc.
Holographic Correction
(a) Recording: collimated lightilluminates the aberrated primary toform the object beam. The hologram iswritten with a reference beam incidentat an angle.
(b) Reconstruction: starlight (distantobject) produces a reconstructedbeam, which is focused to produce anunaberrated image.
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Large Telescope Using Holographically-Corrected Membrane Mirror
• Laser beacon source – “fixed” versus trailing• Single hologram recorded at multiple wavelengths• CTE and creep of membrane material – PBO hasextremely low CTE.• Space environment resistance
LTHM18
Large Telescope Using Holographically-Corrected Membrane Mirror
L’Garde, Inc.
Phase II Plans
• Build a 1m diameter membrane telescope withholographic correction in-situ.• Carry out a full static and dynamic analysis of the conceptselected for a 10 m diameter.• Continue to investigate Real-Time holographic materials –suitability of photopolymers as a holographic medium in aspace environment.• Investigate the possibility of using a distant laser sourcein space – “trailing” or fixed at the ISS for example.• Feasibility of a simple, secondary adaptive optics system.• Modularizing and shielding of the telescope for optimumperformance.