Laser Metrology for an Optical-Path- Length Modulator

TBMG-505

08/01/2005

Abstract
Content

Laser gauges have been developed to satisfy requirements specific to monitoring the amplitude of the motion of an optical path- length modulator that is part of an astronomical interferometer. The modulator includes a corner-cube retroreflector driven by an electromagnetic actuator. During operation of the astronomical interferometer, the electromagnet is excited to produce linear reciprocating motion of the corner-cube retroreflector at an amplitude of 2 to 4 mm at a frequency of 250, 750, or 1,250 Hz. Attached to the corner- cube retroreflector is a small pick-off mirror. To suppress vibrations, a counterweight having a mass equal to that of the corner-cube retroreflector and pick-off mirror is mounted on another electromagnetic actuator that is excited in opposite phase.

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Citation
"Laser Metrology for an Optical-Path- Length Modulator," Mobility Engineering, August 1, 2005.
Additional Details
Publisher
Published
Aug 1, 2005
Product Code
TBMG-505
Content Type
Magazine Article
Language
English