Integral Field Spectrograph Eric Prieto LAM

How to do 3D spectroscopy

3 November 15 & 16, 2005 Eric Prieto -LAM 3D spectroscopy Integral Field Unit: —How to have a projection of a 3D volume to a 2D plan? Scanning (one slit, Fabry-Perot…) Y X Large FOV : high number of exposures

4 November 15 & 16, 2005 Eric Prieto -LAM 3D spectroscopy Integral Field Unit: —How to have a projection of a 3D volume to a 2D plan? Scanning (one slit, Fabry-Perot…) Y X  High resolution: high number of exposures

5 November 15 & 16, 2005 Eric Prieto -LAM 3D spectroscopy Integral Field Unit: —How to have a projection of a 3D volume to a 2D plan? Spatial reformatting: Tiger Y X Lenses Array Short spectrum

6 November 15 & 16, 2005 Eric Prieto -LAM 3D spectroscopy Integral Field Unit: —How to have a projection of a 3D volume to a 2D plan? Spatial reformatting: Fibers Y X Lenses Array Pixel lost… Fibers & Space??? Fibers bundle

7 November 15 & 16, 2005 Eric Prieto -LAM 3D spectroscopy Integral Field Unit: —How to have a projection of a 3D volume to a 2D plan? Spatial reformatting: Slicers Y X

8 November 15 & 16, 2005 Eric Prieto -LAM How to “slice” the target?

9 November 15 & 16, 2005 Eric Prieto -LAM Instrument Status New Optical design (presented at last collaboration meeting): —Dichroics earlier possible: Smallest size (2mm) Better instrument optimization (sampling) Easier focal plane —Shorter instrument (300mm) Implementation phase in a compact volume —Shoehorn needed to enter in the shoebox

Instrument Status

11 November 15 & 16, 2005 Eric Prieto -LAM Instrument specification Spatial ResolutionFOVF/NMagnification General specifications 0,15 arcsec3 arcsecDiam: 2m Telescope Focal plane 14,5 µ m145 µ m N = 10Gy = - 34,38 Slicer 500 µ m 10 mmN = 343,8 Gee slicer = - 1 / 20,8 Gy spectro = - 1 / 1,33 Detector 18 µ m 20 pix / sliceN = 12,3

12 November 15 & 16, 2005 Eric Prieto -LAM Optical design (IR Path) Relay opticsSlicer Unit Collimator Prism CameraDetector

13 November 15 & 16, 2005 Eric Prieto -LAM Slicer Design (IR) Relay optics Collimator Slicer Unit Pupil & Slit mirror Slicer Unit Pupil & Slit mirror

14 November 15 & 16, 2005 Eric Prieto -LAM Optical design (IR Path) Relay opticsSlicer Unit Collimator Prism CameraDetector

15 November 15 & 16, 2005 Eric Prieto -LAM Relay optics IR Path 10 mm Tel FP Re-imaging mirror Dichroics To be redesign in order to fit with the new implementation

16 November 15 & 16, 2005 Eric Prieto -LAM Spot diagram 0.9 µm 0.6 µm 0.45 µm 0.35 µm 1.8 µm 1.5 µm 1.1 µm 0.9 µm IR Path Visible Path Box: - Slice width - 1 IR pixel - 1 Visible pixel 6 configurations 6 slices over the FOV 3 points on each slices

17 November 15 & 16, 2005 Eric Prieto -LAM Optical 0.9µm 1 Px

18 November 15 & 16, 2005 Eric Prieto -LAM 14mm 6mm 5mm

19 November 15 & 16, 2005 Eric Prieto -LAM PSF (POP zemax tool) 0.9 µm 0.6 µm 0.45 µm 0.35 µm 1.8 µm 1.5 µm 1.1 µm0.9 µm Visible Path NIR Path Slit width

20 November 15 & 16, 2005 Eric Prieto -LAM First Optical budgets Ag Optical coating + 2nm + interf prism and dichoics Total optics Total (with detector) Brute Force surface quality budget: Diffraction WFE < 30nm rms 8 reflective surface: 10nm rms per surf Our prototype of slicer: - 5nm rms - Ra: ~1nm

21 November 15 & 16, 2005 Eric Prieto -LAM To Mechanics

22 November 15 & 16, 2005 Eric Prieto -LAM Intrument development Optical Design (Done) Mechanical Concept (end 2005 – Spectro Focal plane and fore optics TBD) Fore-optics design 03/06 Structural analysis 03/06 Interface update with SNAP (March 2006) Development plan and management plan (1st: 02/06; final: 12/06) Concept validation with demonstrator (End 2006)