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EEM calculations in FRED

EEM calculations in FRED. Mikkel Brydegaard Applied Molecular Spectroscopy & Remote Sensing Atomic Physics, LTH. Project. Components. Fiber tip source Off axis parabolic mirror Quartz prism Achromat Sample window Chassis. Source. Ocean Optics ø230 μ m circular fiber tip

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EEM calculations in FRED

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  1. EEM calculations in FRED Mikkel Brydegaard Applied Molecular Spectroscopy & Remote SensingAtomic Physics, LTH

  2. Project

  3. Components • Fiber tip source • Off axis parabolic mirror • Quartz prism • Achromat • Sample window • Chassis

  4. Source • Ocean Optics ø230 μm circular fiber tip • 24° acceptance angle • Apperture to 6° for collimating mirror • Simulated spectral content: 300, 350, 400, 500 and 900 nm

  5. Collimating mirror • Newport. Off-Axis Replicated Parabolic Mirror, 1.500 in. Dia, 4.000 in. EFL, Protected Aluminum Coating

  6. Prism • Esco products • Equilatheral fused silica • 40mm sides • 35° mean dispersion 300-900nm • 40*cos(30+35/2)=27mm apperture • Displacement of optical axis from center of circumcicle of prism 8.93 mm

  7. Achromat • Edmund optics • Uncoated triplet • CaF2 Fused Silica CaF2 • Provided raytracing object from edmund upon signed request

  8. Sample slit • Quartz microscope cover slide • Mirror coating • Nano church

  9. Chassis • Imported from Alibre design • Anodized aluminum • Black lambertian 4% • Contribution

  10. Setup Newportv Off-axis paraboloid Edmund achromatCaF2-QS EscoQuartzprism Quartzwindow Fiber tip

  11. Properties of interest Simulation variables • Throughput • Spectral resolution • Signal to background • Ray numbers • Allow reflections • Allow surface scatters

  12. Resulting rays

  13. Simulation time

  14. Throughput

  15. FWHM

  16. Added background

  17. Signal and back ground contributions 1E-3 3.5E0 3E-6

  18. Spatial profile of background contributions

  19. Experiences • Prism displacement • Ommitment of achromat, in accordance with ”Spectrograph design fundamentals / J.F. James.” • More stray light along slit than perpendicular to it • Parabolic mirrors in FRED

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