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Tip Tilt Mirror

The Zeiss (Jena) fast-steering mirror is an off-axis paraboloid, and has two functions. It collimates the beam, and it provides fast tip-tilt correction, up to 5 arcsec, at up to 20 Hz. It has about twice the throw of the ELECTRA FSM (its predecessor, which is the backup), and higher bandwidth, ~ 200 Hz at zero amplitude, 10 Hz at end of range. It now has an LED display to show when it is in-range?? Cross-hairs can be installed across it. 

Created by Stephen Goodsell sjg@ing.iac.es