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Spectrometers
& OSAs
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 Products
| Gratings: This
web page has a complete listing of high performance
gratings we make along links to graphs of S & P
diffraction efficiencies, dispersion, Bragg Angle sensitivity,
and PDL where applicable.
Also
see these pages:
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Description
Spectroscopy
is the analysis of the energy distribution in the wavelengths
emitted from an object. Spectroscopy devices such as
spectrometers and optical spectrum analyzers normally employ
a diffraction grating to separate the wavelengths in the spectrum
emitted by the object. Every photon collected is very
important because the energy in the individual wavelength
components of the emitted spectrum may be very weak. Furthermore,
the emitted light may be randomly polarized. Therefore,
high diffraction efficiency in both polarizations is
necessary to provide maximum performance. Volume Phase
Holographic Gratings (VPHGs) are ideally suited for spectroscopic
applications because they are capable of providing high diffraction
efficiency for unpolarized light.
Two generic
spectrometer geometries are shown below using transmission
gratings/grisms and not reflection gratings. Our staff
has developed a variety of innovative designs to take advantage
of VPHG high performance in transmission modes.
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Spectrometer
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In-Line Spectrometer
Design
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VPHGs
for Spectroscopy
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Description
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Spatial
Frequency
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Bandwidth
Or CWL1
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CWL1 AOI/AOD2
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S
& P Diffraction Efficiencies
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Dickson Grating: transmission
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940
lpmm
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1525-1565nm
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46.5o
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>88%
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Dickson Grism: reflection (2 passes)
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940
lpmm
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1525-1565nm
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46.5o
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>77%
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Grating: transmission
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600
lpmm
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1525-1565nm
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27.6o
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>85%
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Grism: reflection (2 passes)
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600
lpmm
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1525-1565nm
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27.6o
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>73%
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Grating: transmission
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1200
lpmm
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500nm
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17.5o
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Grating: transmission
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1200
lpmm
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800nm
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28.7o
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Dickson Grating: transmission
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1364
lpmm
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1064nm
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46.5o
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>90%
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Dickson Grating: transmission
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1750
lpmm
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830nm
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46.5o
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>90%
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Dickson Grating: transmission
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1850
lpmm
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785nm
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46.5o
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>90%
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Dickson Grating: transmission
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2290
lpmm
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633nm
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46.5o
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>90%
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Dickson Grating: transmission
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2730
lpmm
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532nm
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46.5o
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>90%
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Dickson Grating: transmission
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2820
lpmm
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514nm
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46.5o
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>90%
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Dickson Grating: transmission
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2970
lpmm
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488nm
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46.5o
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>90%
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Grating: transmission
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474
lpmm
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Grating: transmission
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385
lpmm
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Grating: transmission
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315
lpmm
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Grating: transmission
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210
lpmm
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Custom VPHG: Inquire
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Specify
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350-2500nm
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Fill
In Customer Grating Worksheet
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1.
CWL=center wavelength 2. AOI/AOD=angle of incidence/angle
of diffraction
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We provide a high level of customer
service. Additionally, we offer consulting, design,
prototype, product integration, and quantity production at
competitive prices. For sales info contact 435-752-4301, email
us, or send us a completed Customer
Grating Worksheet.
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