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Proceedings Paper

Prototype high-speed optical delay line for stellar interferometry
Author(s): M. Mark Colavita; Braden E. Hines; Michael Shao; George J. Klose; B. V. Gibson
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Paper Abstract

The long baselines of the next-generation ground-based optical stellar interferometers require optical delay lines which can maintain nm-level path-length accuracy while moving at high speeds. NASA-JPL is currently designing delay lines to meet these requirements. The design is an enhanced version of the Mark III delay line, with the following key features: hardened, large diameter wheels, rather than recirculating ball bearings, to reduce mechanical noise; a friction-drive cart which bears the cable-dragging forces, and drives the optics cart through a force connection only; a balanced PZT assembly to enable high-bandwidth path-length control; and a precision aligned flexural suspension for the optics assembly to minimize bearing noise feedthrough. The delay line is fully programmable in position and velocity, and the system is controlled with four cascaded software feedback loops. Preliminary performance is a jitter in any 5 ms window of less than 10 nm rms for delay rates of up to 28 mm/s; total jitter is less than 10 nm rms for delay rates up to 20 mm/s.

Paper Details

Date Published: 1 December 1991
PDF: 8 pages
Proc. SPIE 1542, Active and Adaptive Optical Systems, (1 December 1991); doi: 10.1117/12.48808
Show Author Affiliations
M. Mark Colavita, Jet Propulsion Lab. (United States)
Braden E. Hines, Jet Propulsion Lab. (United States)
Michael Shao, Jet Propulsion Lab. (United States)
George J. Klose, Jet Propulsion Lab. (United States)
B. V. Gibson, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 1542:
Active and Adaptive Optical Systems
Mark A. Ealey, Editor(s)

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