EEM calculations in FRED Mikkel Brydegaard Applied Molecular Spectroscopy & Remote Sensing Atomic Physics, LTH.

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Presentation transcript:

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 μm circular fiber tip 24° acceptance angle Apperture to 6° for collimating mirror Simulated spectral content: 300, 350, 400, 500 and 900 nm

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

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

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

Sample slit Quartz microscope cover slide Mirror coating Nano church

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

Setup Fiber tip Newportv Off-axis paraboloid Esco Quartz prism Quartz window Edmund achromat CaF2-QS

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

Resulting rays End raysC1C2C3 R R R

Simulation time Calculation timeC1C2C3 R sec5.94 secs31.2 secs R26.25 secs50.2 secs8.76 mins R335.6 secs5.23 mins54.2 mins

Throughput C1C2C3 R156,62%56,85% R260,95%61,23% R361,55%61,85%

FWHM FWHM mmC1C2C3 R R R FWHM nmC1C2C3 R R R

Added background BackgroundC1C2C3 R10,00E+004,70E-032,16E-04 R20,00E+001,40E-031,65E-05 R30,00E+009,09E-042,73E-06

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

Spatial profile of background contributions

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