AO System Design

NGAO Opto-Mechanical Design Work in Progress, PDR Phase

Meeting Minutes

• April 21, 2009

Documents

Links to Conceputal Design Phase Materials (AKA system design phase)

• NGS and LGS Acquisition Camera (March 2008)
• Calibration and Diagnostics Design (March 2008)

Designs originating in Conceptual Design Phase

• KNGAO_2-tier_folded-2nd-relay_v4_wtelescope.ZMX: Cascaded-relay, 2-tier design carried over from conceptual design phase
• KNGAO_annotated_layout.ppt: Powerpoint slide showing layout of 2-tier cascaded relay from conceptual design phase.

• NGAO-1-tier-champion-dec2007.ZMX: Cascaded-relay, 1-tier, 140mm DM carried over from conceptual design phase
• 1-tier-champion-dec2007.png: Slide showing 1-tier, 140mm DM cascaded relay design carried over from conceptual design phase.

Single Relay concepts

• KNGAO_splitrelay_25mmDM_asphereLGSfeed_wtelescope_v4.ZMX: Single relay design, 25mm MEMs DM
• KNGAO_25mmMEMs.ppt: Powerpoint slide with layout of single relay with 25mm MEMs.

• KNGAO_200mmDM.ZMX: Single relay design, 200mm DM (48 actuator, 5mm pitch)
• KNGAO_200mmDM.ppt: Powerpoint slide with layout of single relay with 200mm, 48x48, piezo DM.

• KNGAO_168mmDM_wTT.ZMX: Single relay design, 168mm DM (48 actuators, 3.5mm pitch), separate tip/tilt
• KNGAO_168mmDM.ppt: Powerpoint slide with layout of single relay with 168mm 48x48 piezo DM.

Cascaded Relay and Switchyard Concept that avoids the dichroics between relays

2-tier, 100 mm beam in 1st relay

• KNGAO_2-tier_straightthru_2nd-relay_v4_wtelescope.ZMX: Cascaded-relay design, 2-tier, 100mm DM, avoiding dichroic changer.
• KNGAO_cascade_straightthru.ppt: Powerpoint slide of 100mm DM cascaded relay with no dichroic changer.

1-tier, 140 mm beam in 1st relay

• KNGAO_cascade_140mmDM_straightthru_25mmMEM.ZMX: Cascaded-relay design, 1-tier, 140mm DM, avoiding dichroic changer.
• KNGAO_cascade_straightthru_1tier.ppt: Powerpoint slide of 140mm DM cascaded relay with no dichroic changer.

Pickoff switchyard details (valid for either 1st relay option)

• KNGAO_OptoMechanicalLayout.ppt: KNGAO_OptoMechanicalLayout.ppt
• NGAO_OptoMech_SwithyardPickoffOption_Jan7,09.jpg: White-board drawing of focal plane pick-offs switchyard concept, with LOWFS and 2nd relay of cascade sandwiched between the LOWFS. This is roughly to scale as drawn on the board (see the 12-inch ruler in the picture).
• kngao_model_w_telescope.EASM: SolidWorks e-drawing of 2-tier layout and pickoff switchyard. (delete the enclosure to see the optics)

1-tier, 100mm beam in 1st relay Passes 120 arcsecond tip/tilt star field.

• KNGAO_1-tier_100mm_straightthru_2nd-relay_wtelescope.ZMX: Cascaded-relay design, 1-tier, 100mm DM, avoiding dichroic changer.
• KNGAO_cascade_straightthru_1tier_100mm.ppt: Powerpoint slide of 1-tier, 100mm DM cascaded relay of 120" field with no dichroic changer.

Flipped the second relay around, per Chris' request. Added NGS WFS and assumed one science instrument, with ability to add more.

• KNGAO_1-tier_100mm_120arcsec_straightthru_2nd-relay_wtelescope_v2.ZMX: Cascaded-relay design, 1-tier, 100mm DM, avoiding dichroic changer, version 2

• KNGAO_cascade_straightthru_1tier_100mm_v2.2.ppt: Powerpoint slide of 1-tier, 100mm DM cascaded relay of 120" FOV, no dichroic changer, proper orientation.

March 19, 2009: Expanded the second relay field to 40 arcseconds, first relay still 120 arcseconds. Also cleaned up some cooridinate breaks and folds.

• KNGAO_1-tier_100mm_120arcsec_straightthru_2nd-relay_wtelescope_v3.ZMX: Cascaded-relay design, 1-tier, 100mm DM, 2nd relay passes 40"

March 30, 2009; Added acquisition camera pickoff for LOWFS and interferometer feed dichroic beamsplitter. Added FSM to NGS WFS feed.

• KNGAO_1-tier_100mm_120arcsec_straightthru_2nd-relay_wtelescope_v4.ZMX: Cascaded-relay design, 1-tier, 100mm woofer, no dichroic changer, acq. camera and interferometer feed included
• KNGAO_cascade_straightthru_1tier_100mm_v4.ppt: Powerpoint slide of 1-tier, 100mm DM cascaded relay of 120" field, acq camera and interferometer feed included.

• PDR_relay_design.doc: draft document, preliminary optical design