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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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
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
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
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