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Published byDenis Simmons Modified over 9 years ago
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EEM calculations in FRED Mikkel Brydegaard Applied Molecular Spectroscopy & Remote Sensing Atomic Physics, LTH
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Project
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Components Fiber tip source Off axis parabolic mirror Quartz prism Achromat Sample window Chassis
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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
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Collimating mirror Newport. Off-Axis Replicated Parabolic Mirror, 1.500 in. Dia, 4.000 in. EFL, Protected Aluminum Coating
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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
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Achromat Edmund optics Uncoated triplet CaF2 Fused Silica CaF2 Provided raytracing object from edmund upon signed request
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Sample slit Quartz microscope cover slide Mirror coating Nano church
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Chassis Imported from Alibre design Anodized aluminum Black lambertian 4% Contribution
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Setup Fiber tip Newportv Off-axis paraboloid Esco Quartz prism Quartz window Edmund achromat CaF2-QS
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Properties of interest Throughput Spectral resolution Signal to background Simulation variables Ray numbers Allow reflections Allow surface scatters
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Resulting rays End raysC1C2C3 R1175385524710 R2240566122430448 R3145604187502693084
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Simulation time Calculation timeC1C2C3 R10.933 sec5.94 secs31.2 secs R26.25 secs50.2 secs8.76 mins R335.6 secs5.23 mins54.2 mins
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Throughput C1C2C3 R156,62%56,85% R260,95%61,23% R361,55%61,85%
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FWHM FWHM mmC1C2C3 R10.1150.147 R20.146 R30.136 FWHM nmC1C2C3 R114.3018.33 R218.14 R316.9116.93
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Added background BackgroundC1C2C3 R10,00E+004,70E-032,16E-04 R20,00E+001,40E-031,65E-05 R30,00E+009,09E-042,73E-06
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Signal and back ground contributions 3.5E0 1E-3 3E-6
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Spatial profile of background contributions
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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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