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an optomechanical transducer for the AURIGA “bar” gw detector. cryogenic optics towards the quantum limit: high finesse cavities, fibers, piezo actuators, etc @ 4.2 K . concept and optics: Livia Conti, Maurizio DeRosa, Francesco Marin

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Presentation Transcript
slide1

an optomechanical transducer

for the AURIGA “bar” gw detector

cryogenic optics towards the quantum limit:

high finesse cavities, fibers, piezo actuators, etc @ 4.2 K

concept and optics: Livia Conti, Maurizio DeRosa, Francesco Marin

cryogenics: Michele Bonaldi, Giovanni A. Prodi, Luca Taffarello, Jean-Pierre Zendri

optical transducer

bar

The Concept

Optical Transducer

Variations of the transducer

cavity length are measured

by the stabilized laser

Transducer cavity:

a Fabry-Perot cavity between

the bar and the resonant plate

Reference cavity:

a stable Fabry-Perot cavity

acting as length reference

Laser source frequency

locked to the reference cavity

optical transducer3
Optical Transducer

Status: Room temperature test

Experimental set-up

Achieved gw sensitivity

L.Conti et al,. Jour. Appl. Phys. 93 (2003) 3589

optical transducer4
Optical Transducer

Status: Cryogenics

Q measurements in the Transducer Test Facility

New Cryostat for the bar resonator under construction

slide5

will operate at 4.2 K ~ 1 year

    • a prototype gw detector in coincidence with AURIGA
    • study at low T the coating thermal noise and the substrate
    • thermoelastic noises (“thermodynamic” and “photothermal”)
    • at the displacement level ~ 10-20 m/Hz1/2