THORLABS OCT-LK Series, Руководство пользователя

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OCTP Series Scanner Chapter 3: Components and Compatibility
Page 6 MTN003971
3.1.3. Reference Arm Module (not for OCTP-NR)
Figure 4 Reference Arm Module
The reference arm module contains a mounted mirror (i.e., retroreflector) that reflects the beam from the light
source back into the OCT interferometer.
In order to match the optical path length in this reference arm to the optical path length of the light from the
sample, it may be necessary to translate the mirror along the axis of the 30 mm cage system. Coarse length
adjustments can be performed by loosening the top cage plate or the variable lens tube. Fine adjustments of
the reference length can be performed by moving the retro reflector: ±2 mm (total range of 4 mm) for the OCTP
with the non-rotating zoom housing and 12.7 mm for the linear stage of the OCTP-PS.
In order to adjust the reference arm intensity, a zero-aperture iris is located in front of the mirror.
For objective-dependent dispersion compensation, a holder hosting a compensation glass sample is included.
The 30 mm cage system makes it easy to add optomechanical and optical components to the reference arm.
For instance, windows for group velocity dispersion (GVD) compensation can be mounted in this arm, as can
optical filters.