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The SA200 family includes 12 Fabry-Perot interferometers
that cover six spectral regions with either a 1.5GHz or
10GHz Free Spectral Range (FSR). The design of the
Fabry-Perot interferometer cavity is comprised of an Invar
cavity with internal piezo stacks. This design utilizes the
negative thermal coefficient of the piezo stacks to create
the nearly athermal cavity that is necessary for the stability
of these high resolution spectrometers.
The tutorial section on pages 650-652 covers the basic
theory of operation, including an explanation of the effect
of the input beam diameter on the resolution of the
instrument. In order for the instrument to achieve the
specified resolution, the input beam diameter must not
exceed the maximum diameter specification, even though
the input aperture for the instrument is significantly larger
than the specification.
The SA200 can be mounted via a Ø2" ring near the input
end of the interferometer. The KS2 is the recommended
mount for the SA200 since it will hold the SA200 tightly
and provide the kinematic control necessary for proper
aligninment in the optical cavity. In contrast, the SA210
has a Ø1" mounting ring near the input end of the
interferometer, and as a result, the recommended mount
is the KS1.
Free Spectral Range1 (FSR)
Measured in milliseconds:
FWHM
Measured in microseconds:
(FSR/FWHM)
Actual Calculated Finesse:
Maximum Input Voltage: 150V
Free Spectral Range: 1.5Ghz
Minimum Finesse: >200
Resolution: 7.5MHz
Outer Housing Material: Black Anodized Aluminum
Fabry Perot Cavity Material2: Low thermal expansion Invar ®
Dimensions: Ø 2” Flange
Total Length: 5.85”
Features
■ Ultra Stable Invar Cavity
■ Confocal Cavity Design
■ Mounted Input and
Output Alignment Irises
Specifications
■ 1.5GHz or 10GHz Free
Spectral Range
■ Low Scan Voltage, 5V
per FSR @ 633nm
