THORLABS EXULUS-HD2 User Manual page 39

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EXULUS Spatial Light Modulators Chapter 4: Setup and Software Operation
A user defined image is converted to its holographic pattern. The Tilt in both X and
Y orientation and the focal length (the distance from the SLM, where the hologram
is imaged to) of the generated pattern can also be defined. A small preview window
shows the input image which can be zoomed by clicking on it.
The uploaded image is converted to 8 bit. Also, the image position and the
inversion of black and white can be user-defined before generation. The
wavelength, which is set at 633 nm as the default for EXULUS-HD2 (EXULUS-
HD2HP), 1064 nm for EXULUS-HD3 (EXULUS-HD3HP), and 1550 nm for
EXULUS-HD4, should be set so that it matches the wavelength of the light source.
Figure 49 Generated CGH Pattern of Uploaded Image
Pattern Mode
The pattern mode consists of four commonly used patterns: Fresnel Lens,
Diffraction, Vortex, and Cubic Phase.
In Fresnel Lens mode, the wavelength and focal length can be defined by the user.
It is used to primarily focus an incoming collimated beam to a spot at approximately
the defined focal length.
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