LETO-720 Fast LCOS Spatial Light Modulator

The LETO-720 combines the high data bandwidth and low latency of the 4K resolution GAEA-2.1 (4k – 60fps – RGB888) driver and a fast display version of the LETO-3 SLM with a resolution of 1920 × 1080 pixels (~1 ms response-time at 520 nm).

LETO-720 LCOS SLM – Microdisplay Features

Display Type

Reflective LCOS (Phase Only)

Resolution

1920 x 1080 Pixel

Pixel Pitch

6.4 µm

Fill Factor

93 %

Active Area

12.29 x 6.91 mm (0.55″ Diagonal)

Addressing

8 Bit

Signal Formats

HDMI – HDTV Resolution

Input Frame Rate

240 Hz

Display Update Rate

240 Hz

720 Hz (RGB coded)

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The LETO-720 SLM offers 2 modes:

240 Hz mode: This mode utilizes the high video data bandwidth of the driver to address real 240 Hz data on the SLM. The refresh rates for both, input frames via the HDMI graphics interface and the output, are boosted to 240 Hz.

720 Hz modulation (RGB coded): This mode makes use of the RGB color channels in addition to the 240 Hz mode. Three consecutive monochrome images are stacked in one full-color image.

An example Python script comes with the SLM which automates the generation of the required 3 color channel images.

Versions

We currently offer one version optimized for the VIS range between 420 to 650 nm.

Product

Reflectivity

Max. Phase Shift

Wavelength Range

Inquiry

LETO-720-VIS-127C 62-72 % 2.2 Pi @ 633 nm 420 – 650 nm

LETO-720 Spatial Light Modulator Kit – Contents:

LETO-720 SLM – Scope of Supply

• Phase only display incl. flex cable
• Driver unit
• Device mount
• Power supply + cable
• HDMI cable
• 2 x USB cable
• TMS-001 Thermal Management System
• Safety instructions & quick-start guide (test polarizer inside)
• USB flash drive with software package and documentation

Software Features

The LETO-720 phase only modulator devices can simply be addressed like an external monitor using the standard HDMI interface of the graphics card. No additional software or dedicated hardware is needed to operate the SLM.

The device is delivered with a GUI (Graphical User Interface) based Configuration Manager software. The Configuration Manager can be used to change geometrical settings and the electrooptical response by applying a new gamma curve or another digital drive scheme. An USB interface is used for these advanced callibrations.

In addition a HOLOEYE SLM Pattern Generator software is provided with the SLM:

• Computation of computer generated holograms (CGH) from user defined images
• Generation of SLM signals representing basic optical functions such as lenses, gratings, axicon and vortex functions
• Superposition of CGH’s with basic optical functions to combine functionalities

Besides that a special SLM Slideshow Player software comes with the device. Also an SLM Display SDK is available for download which provides APIs (Application Programming Interface) for different programming languages to show images and data/ phase arrays directly on a HOLOEYE Spatial Light Modulator:

• National Instruments LabVIEW™ LabVIEW 2017 and later
• MathWorks MATLAB® R2009b and later
• Octave 7.2, 8.4
• Python™ 2.7 and 3.x
• C or C++ compiler (e. g. Microsoft Visual C++ Compiler)