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EEM calculations in FRED

This document outlines the components and configurations used for numerical simulations in applied molecular spectroscopy. Key elements include a fiber tip source, off-axis parabolic mirrors, quartz prisms, and achromats. The use of Newport optics and Esco products offers precision in spectral content across various wavelengths. Detailed simulation variables such as throughput, spectral resolution, and signal-to-background ratio are analyzed to optimize system performance. Insights into prism displacement and alignment of achromats are also discussed, emphasizing the importance of design fundamentals in spectrograph development.

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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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