LIGO-G030281-00-D LIGO II1 AUX OPTICS SUPPORT Michael Smith, 6/11/03 STRAY LIGHT CONTROL ACTIVE OPTICS COMPENSATION OUTPUT MODE CLEANER PO MIRROR AND PO.

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Presentation transcript:

LIGO-G D LIGO II1 AUX OPTICS SUPPORT Michael Smith, 6/11/03 STRAY LIGHT CONTROL ACTIVE OPTICS COMPENSATION OUTPUT MODE CLEANER PO MIRROR AND PO TELESCOPE INITIAL ALIGNMENT SYSTEM OPTICAL LEVER SYSTEM PHOTON DRIVE

LIGO-G D LIGO II2 STRAY LIGHT CONTROL REQUIREMENT: noise < 1/10 gravity wave signal »BAFFLES –Errant beam baffles:MC1, MC2, MC3, MMT1, MMT2, MMT3, PRM (45) –Input optics baffle: HAM2, HAM8 (3) –Recycling cavity elliptical baffles: ITMx, ITMy, PRM (9) –Arm cavity baffles: ITMx, ITMy, ETMx, ETMy (12) –ETM telescope input baffle (6) –Cryopump baffles Manifold baffle: in manifold between cryopump and ETM (3) Conical baffle: in vertex cryopump spool (3) »BEAM DUMPS –Ghost beam dumps in vertex area: ITMx, ITMy, BS, PRM, SRM (84) »OUTPUT FARADAY ISOLATOR (LIGO1) (3)

LIGO-G D LIGO II3 ACTIVE OPTICS COMPENSATION See Dave Ottaway presentation

LIGO-G D LIGO II4 OUTPUT MODE CLEANER Requirements: »Transmissivity>99% »Linewidth<2 MHz FWHM »Mode attenuation >10 4 for higher order modes > TEM 00 Physical Characteristics »Monolithic triangular cavity, flat-flat-curved »Lengthapprox 300 mm »Finesse> 400 Active length control--PZT, or thermal Mode matching telescope input Video camera for auto mode identification Integrated AS photodetector

LIGO-G D LIGO II5 OUTPUT MODE CLEANER CONCEPT

LIGO-G D LIGO II6 PICKOFF MIRROR Total required, 12 (LIGO1)

LIGO-G D LIGO II7 PO TELESCOPE 12:1 redux, off-axis parabolas Total required, 12 (LIGO1)

LIGO-G D LIGO II8 INITIAL ALIGNMENT SYSTEM ALIGNMENT Requirements: »Angular pos< 0.1 mrad »Transverse pos< 1 mm »Axial pos< 3 mm Equipment: »Pre-surveyed monuments »Optical transit square »Total station theodolite (electronic distance meas. & autocollimation) »Lateral transfer retroreflector »IR aucollimator/projector for alignment of PO mirrors, beam dumps, baffles, and PO telescopes

LIGO-G D LIGO II9 INITIAL ALIGNMENT SYSTEM VISUALIZATION CHAMBER ILLUMINATION CHAMBER VIDEO IMAGING NOTE: Existing chamber illuminators and video cameras will be used

LIGO-G D LIGO II10 OPTICAL LEVER SYSTEM REQUIREMENTS »Provide continuous pitch and yaw measurement of COC orientation »Direct access to mirror surface through external viewport »Long-term stability<0.1 mrad Physical Characteristics »Laser –Wavelength nm –PowerTBD »Sensor –Quad photodiode –Focal plane imaging system to sense angle only, coarse and fine zoom sensitivity »Total required 21

LIGO-G D LIGO II11 OPTICAL LEVER FOCUS LENS CONCEPT Focal length zoom 6.7 – 40m Angle sensitivity1 x x rad

LIGO-G D LIGO II12 PHOTON DRIVE REQUIREMENTS »Longitudinal force0.1 nN »Force noise power< 2.5 x N/Hz ½ »Dynamic range> 4 x 10 4 Hz ½ CHARACTERISTICS »Laser –Wavelength nm –Power1 W »Relative intensity noise< 2 x Hz -½ »Total required 6

LIGO-G D LIGO II13 PHOTON DRIVE CONCEPT