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Original datas : Fiber bundle @ focal plane of F/5,5 telescope primary focal plane - TBC

Original datas : Fiber bundle @ focal plane of F/5,5 telescope primary focal plane - TBC Telescope FOV : 15’x15’ TBC Spatial resolution : 18 arcsec (1 µlens @ focal plane) Spectral resolution : 100 Detector : 1024x1024. Manpower : D.Horville : Optical Engineer

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Original datas : Fiber bundle @ focal plane of F/5,5 telescope primary focal plane - TBC

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  1. Original datas : Fiber bundle @ focal plane of F/5,5 telescope primary focal plane - TBC Telescope FOV : 15’x15’ TBC Spatial resolution : 18 arcsec (1 µlens @ focal plane) Spectral resolution : 100 Detector : 1024x1024

  2. Manpower : • D.Horville : Optical Engineer • - Design and fabrication of anamorphoser for GIRAFFE spectrograph • On ESO Very Large Telescope • - Desing and fabrication of an Optical Anamorphoser for X-shooter on VLT • Zemax user, mathematica,Mathcad • B.Lecomte : Technology Engineer • Characterization of A prototype of spectrograph for FUEGOS (GIRAFFE) • Characterization of fiber FRD on several fibers • Technology design, fabrication and delivering of Band 1 detector for HIFI instrument on Herschel space telescope (launch : 2008) • Inventor 11 and zemax user (recent).

  3. Supplier : • Le verre Fluoré (Rennes, France) • Fabrication of IRSIS anamorphoser • Developement and fabrication of IR µlenses matrix. • Prototype of µlens matrix already done  quality TB improved. • Confidant with assimbling bundle procedure. • Wait for «frozen » prototype ordering. • How many fibers and µlens

  4. Micro-lenses • Criterii : • micro-lens f length : Short  exit pupil of telescope @ infinity. • F ratio of beam focused by µlens > F number of µlens. • µlens diameter> fiber diameter (core+cladding) • Image pupil diameter < Micro-lens core

  5. Bundle entrance Square lenses FL FL Fcore Fcore Fe Wt We n µlens pitch e Fe= 0,95*Fcore µlens pitch = FL/1,414 Hexagonal lenses Fiber diameter(core+cladding)< µlens FL µlens pitch = 2*FL/rac(3)

  6. Entrance µlens charactéristics (calculus) Telescope = diam.300mm Aperture = F/12 Fiber diameter = 100 µm Lens diameter = 315 µm µlens radius of curv. = 2.3mm Dimensions available for commercial fabrication. Check feasibility with infrared materials

  7. Fcladding 180µm Fbuffer 200µm Fiber description IR guide type 3 Fcore 100µm Core index : 1,49 @ 2µm Cladding index : 1,4765 @ 2µm (NA = 0,2) Cladding thickness : 40µm Buffer material : acrylate TBC Buffer thickness : 5 or 10µm Buffer cannot be removed (fiber protection)

  8. Optimization : Bundle output Parameters : Optim : -lens radius of curvature -Thickness of µlens Fixed Files : -Fiber diameter : 100 µm -Output NA : 0,2 -Spectro input apert : F/5 µlens diameter : 295µm 200µ 760µm 432µm

  9. Bundle output : conclusions Slit quality is strongly dependant of : Spectrograph aperture Entrance F/5 : a good choice Shape of lens convexe face Ellipsoïdal lens Vs Spherical

  10. Is it a strong goal having a well define slit ? Low resolution = relax slit quality?  D R ?

  11. How to separate lower band and higher band? Duplicate fiber output?(feasibility, transmission?) Infrared Dichroïc (losses?)

  12. Spectrograph : Czerny Turner type F/5 entrance. Parabolic off axis mirrors Serious Optimization  TBDone

  13. Strong needs of frozen parameters  Accurate optimization Files for bundle and test bench fabrication Nb of fibers, µlens dimensions, slit length

  14. Thermal model? ISRO, TIPR, CNRS,CNES? Mechanical design? LeV.Fluoré / interfaces (TIPR/CNRS)

  15. Test Bench Transmission, quality Qualification Vibration, thermal cycling, cooling

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