THORLABS WFS150, Operation Manual

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29 Description
© <2007> ... Thorlabs GmbH
3.2
Parts List - Accessories
A complete wavefront analyzing system consist of a WFS150 or WFS150C
sensor, a USB2.0 cable and an PC or laptop. You don't have to install an
additional card into your PC and you don't need external power supply.
The shipping package contains:
·
Wavefront Sensor instrument as an external measurement head with dust
cover
· Mounting adapter plate and 4 mounting screws M3x6
· USB2.0 high speed cable USB A to Mini USB B, 1,5 m
·
CD-ROM with the required driver and application software included
·
Wavefront Sensor operating manual
The Wavefront sensor comes with different configurations depending on the order
code.
Two Wavefront Sensor Models
There are two different versions available which differ in the implemented
microlens array (MLA, see data here
Microlens Data ) and its distance to the CCD
camera sensor.
·
WFS150 uses an anti-reflection (AR) coated MLA that reduces the reflection
from the array to below 1% within the wavelength range 400 - 900 nm .
Note, that the total reflection from the entire instrument can be higher due to
reflection from the CCD cover glass and chip itself.
This model is well suited
for applications that do not tolerate back-
reflections back into the measurement setup, for instance because it
contains a laser without an isolator but parallel beam and long coherence
length. Use this model if other ways for preventing back-reflection line tilting
the Wavefront Sensor with respect to the input beam are not feasible.
·
WFS150C uses a MLA with a chrome mask on it that prevents light going in
between the microlenses directly to the CCD detector. This increases the
image contrast of the detected spotfield and improves the instrument
accuracy, especially in case of strong wavefront deformations. The
wavelength range is not restricted by an AR coating and covers the full
sensitivity range of the Silicon CCD detector
200 - 1100 nm (with largely
reduced sensitivity at the edges). Take into account that such a chrome
mask that cannot be anti-reflection coated may
reflect up to 25% of the
input light back to your measurement setup. It can be helpful to tilt the
sensor a bit or insert an attenuator in order to reduce the amount of light
reflected back into your measurement setup.
Both models are usable within different wavelength ranges. Due to the AR
coating used inside WFS150 it is best suited within this range but not outside
where the AR coating may have reflective properties! See the following
Technical Data for details.