monochromator - stony brook universityultracold.physics.sunysb.edu/.../talks/monochromator.pdf ·...
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Monochromator
Optics Rotation Spring 2008Chris Corder
Weinacht Group
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Czerny-TurnerMonochromater Device used to extract a thin regions of
wavelengths from a wider range ofwavelengths
Would be used for Na lasing experiment toprovide cleaner signal
Ref 1
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Instrument Sensitivity Resolution of a grating
!
" =#
$#
!
asin" = m(# + $#)
asin" = m +1
N
%
& '
(
) * #
!
" = mN
!
"# =#
mN
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Resolution
Diffraction Grating Spacing -1200 g/mm Width - 52.8 mm
Resolution at 63,360 At 750 nm sensitivity of .012 nm
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McPherson Monochromater Works well and has
excellentsensitivity, but hadto be operatedmanually
Made data takingslow and oftenpainful
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Electric Motor Device came with an electric motor to
drive rotate the mirror However had outdated power plug and
needed to be replaced
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Data Taking The motor is connected to a series of
gears so that the rotation speed can beadjusted in terms of nm/min
Data was taken with a digitaloscilloscope
30 traces were averaged each second
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Pulse Shaper Spectrum
Left - McPherson MonochromatorRight - Digital Spectrometer
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Rubidium Spectrum
Left - Data with Rb at 40ºCRight - Data with Rb vapor at 125ºC
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Thanks and ReferencesSpecial Thanks to Steve Clow, Uvo Hölscher,
and Tom Weinacht
1 - Photo From “Monochromator”,http://en.wikipedia.org/wiki/Image:Czerny-turner.png 2008