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2-Tier Layout (RK 11/20/07)

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2-Tier Layout RK 11 - PowerPoint PPT Presentation


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2-Tier Layout (RK 11/20/07). 1-Tier Layout (RK 11/26/07). Existing Keck AO System Rotator, TTM & OAP optics actual diameters used Everything just passes 120” dia field 75” off-axis field point partially vignetted Rotator M1 is 121.6 mm from focus LGS & dNIRI dichroics left in output beam.

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slide3
Existing Keck AO System

Rotator, TTM & OAP optics actual diameters used

Everything just passes 120” dia field

75” off-axis field point partially vignetted

Rotator M1 is 121.6 mm from focus

LGS & dNIRI dichroics left in output beam

slide4
Modified Keck AO System

Rotator M1 increased from 220 to 260 mm dia,

M2 from 160 to 180 & M3 from 290 to 350 mm.

M1 to M2 separation increased from 243.5 to 290 mm.

Rotator M1 is 110 mm from focus.

TTM increased from 203 to 240 mm

OAP1 increased from 250 to 320 mm

slide5
Modified Keck AO System w/ Dichroic Fold to Narrow Field Relay

Dichroic at 15 deg incidence used to fold beam after 1st relay to narrow field relay

150” diameter field shown up to 1st narrow field relay OAP

30” diameter field shown through narrow field relay

Dichroic transmits light to dNIRI/LOWFS

2nd OAP of narrow field relay could potentially be shorter focal length

This gives the best wavefront quality to the narrow field

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LGS

WFS

LGS Dichroic – Another possibility

Put the dichroic in the collimated space after the 1st DM

Can use a transmissive optic to reconverge

the light to the LGS WFS

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