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7Installation

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.

WFS150-7AR / WFS10-7AR 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.

WFS300-14AR / WFS10-14AR 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.

Due to the increased focal length this sensor features an increased sensitivity

and accuracy ( /50 instead of /15). On the other side, this advantage comes

along with reduced spatial resolution (300 µm pitch instead of 150 µm) and

dynamic range.

NOTE

The specified reflectivity of the AR coated MLA is valid only within the stated

wavelength range. Outside of this wavelength range, the reflectivity may increase

remarkably. Please see also Microlens Data .

THORLABS WFS Series User Manual

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