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PLUTO-2.1 Spatial Light Modulator – Microdisplay Features
Display Type: Reflective LCOS (Phase Only)
Resolution: 1920 x 1080
Pixel Pitch: 8.0 µm
Fill Factor: 93 %
Active Area 15.36 x 8.64 mm (0.7″ Diagonal)
Addressing 8 Bit (256 Grey Levels)
Signal Formats HDMI – HDTV Resolution
Input Frame Rate 60 Hz

The PLUTO-2.1 Spatial Light Modulator is the all-rounder within our product range. It is the best qualified and diversified SLM platform with many versions optimized for specific requirements, including high reflectivity versions featuring a dielectric mirror for high power applications. The PLUTO hardware is already implemented in different industrial applications.

The PLUTO-2.1 phase only Spatial Light Modulator (SLM) consists of a driver unit with standard digital video interface (HDMI) and a phase only LCOS (Liquid Crystal on Silicon) microdisplay with full HD resolution (1920 x 1080 pixel) and 8 µm pixel pitch leading to an active area diagonal of 0.7” with aspect ratio of 16:9.

The PLUTO-2.1 SLM is a plug & play phase modulator device and can be addressed with phase functions via standard graphics cards as an extended monitor device. The green color channel of the video signal is used for addressing 8 bit gray level patterns. Addressing can be done using the supplied Pattern Generator software or the SLM Slideshow Player software or standard image viewer software. HOLOEYE also provides an SLM Display Software Development Kit (SDK) which provides APIs (Application Programming Interface) for different programming languages.

HOLOEYE offers different display versions that can be driven with the PLUTO-2.1 driver unit. The different panel versions are optimized for the use at different wavelength ranges and different applications. All versions use fast full digital addressing which assures high reliability and a compact driver unit as basically only two voltages need to be generated.

The PLUTO-2.1 driver uses an HDMI interface for addressing phase functions and an USB connection to communicate with the driver (to changing the voltage vs. gray level distribution (gamma control) and dynamic range (voltage across the LC cell) in order to calibrate the SLM for different wavelengths). Besides this the driver features a trigger sync output to synchronize the device with external devices.

PLUTO-2.1 update:

With the PLUTO-2.1 firmware update we enabled a faster pulse addressing frequeny which provides a higher dynamic range for addressing voltages. With an adjusted drive sequence and configurations the phase stability was further improved and with that, the diffraction efficiencies could also be enhanced.

With the higher bandwidth we also increased flexibility in terms of configurations. The SLM devices come with different sets of configurations for optimized response times or optimized phase stability.

With an adjusted drive sequence the PLUTO-2.1 driver is even capable of addressing 3 x 8 bit within a 60Hz frame (leading to 180 Hz) and can be used for color field sequential phase operation using a fast display version for the visible range (e.g. the PLUTO-2.1-VIS-014 version).

The PLUTO-2.1 driver also features a dual-core ARM® Cortex™-A9 processor which also includes on-chip memory. This enables the user to program additional functionality which is directly processed on the SLM device (e.g. a slideshow from images which are loaded from USB flash or from internal memory). The dual-core system runs an embedded Linux™ SMP operating system and includes a library which provides full control and supervision of the display and driver board. The PLUTO-2.1 provides access through Serial and Ethernet-over- USB2 (RNDIS) interfaces and can be programmed using standard Ubuntu™ cross compile GCC toolchain.

The standard PLUTO displays show a reflectivity of approx. 65%-95% (dependent on version) and diffraction efficiencies of more than 80%.

PLUTO-2.1 LCOS Spatial Light Modulator Versions

PLUTO-2.1 LCOS SLM Wavelength Range

Besides the standard PLUTO-VIS and PLUTO-NIR versions there are special high retardation versions available (-HR versions) which show a considerably higher phase retardation compared to the standard panels, which enables more stable addressing or mod 4π respectively mod 6π phase functions to be addressed. This can be beneficial for wave front functions as this enables higher slopes and can reduce transition points in the addressed function compared to mod 2π encoding.

The pulse code modulation for digitally addressed devices leads to a slight superimposed phase flicker. For some applications a stable phase response is required. This can be accomplished driving the high retardation panels with low voltage settings for 2π phase retardation, however compromising the response time.

Some PLUTO SLM display versions are equipped with a dielectric mirror coating to increase the reflectivity to >90%. Due to the increased reflectivity less absorption occurs and these display versions can be used with higher incident laser power compared to the standard versions.

Version Wavelength Range Reflectivity Max. Phase Shift Comment Recommendation
PLUTO-2.1-UV-099 350 – 500 nm 90 %
(80% at 500 nm)
5.2 Pi @ 355 nm
4.9 Pi @ 405 nm
Dielectric Mirror UV resistance,
Higher Power Use
PLUTO-2.1-VIS-014 420 – 650 nm 65 % 4.2 Pi @ 530
3.0 Pi @ 650 nm
Fast Response Time
PLUTO-2.1-VIS-016 420 – 650 nm 67 % 6.9 Pi @ 530 nm
5.2 Pi @ 633 nm
High Retardation
Low Phase Flicker
PLUTO-2.1-VIS-130 500 – 670 nm 94 % (average) 3.2 Pi @ 530 nm
2.5 Pi @ 633 nm
Dielectric Mirror Higher Power Use
PLUTO-2.1-NIR-144 420 – 1100 nm 80 % (average) 10 Pi @ 520 nm
5.2 Pi @ 800 nm
3.6 Pi @ 1064 nm
Broadband Use
PLUTO-2.1-NIR-015 650 – 1100 nm 65-73 % 5.4 Pi @ 800 nm
3.6 Pi @ 1064 nm
High Retardation
Low Phase Flicker
PLUTO-2.1-NIR-113 730 – 940 nm 95 % 2.5 Pi @ 800 nm Dielectric Mirror Higher Power Use
PLUTO-2.1-NIR-149 1000 – 1100 nm 93 % 2.9 Pi @ 1064 nm Dielectric Mirror Higher Power Use
PLUTO-2.1-NIRO-023 1000 – 1400 nm 74 % 4.2 Pi @ 1300 nm
PLUTO-2.1-TELCO-013 1400 – 1700 nm 80 % 3.9 Pi @ 1550 nm
PLUTO-2.1-TELCO-142 1500 – 1600 nm 93 % 3.4 Pi @ 1550 nm Dielectric Mirror

PLUTO-2.1 Spatial Light Modulator Kit – Contents:

PLUTO-2 Spatial Light Modulator Deliverables

PLUTO-2.1 Spatial Light Modulator – Scope of Supply
PLUTO-2.1 SLM Driver Box
Phase Only Display incl. Flex Cable (1920 x 1080 Pixel)
HDMI Cable
USB Cable
Power Supply (12V DC)
Magnetic Display Mount
Device Mount
Safety instructions & quick-start guide
USB flash drive with documentations, detailed manual, Configuration Manager and SLM software

PLUTO-2.1 Phase Modulator – Software Features:

PLUTO-2 SLM Configuration ManagerThe PLUTO-2.1 phase only modulator devices can simply be addressed like an external monitor using the standard DVI / HDMI interface of the graphics card. No additional software or dedicated hardware is needed to operate the SLM.

The device is delivered with a Configuration Manager software. The Configuration Manager can be used to change geometrical settings, brightness, contrast and the electrooptical response by applying a new gamma curve or another digital drive scheme. For these advanced calibrations the device uses an USB connection to a virtual COM port of the computer.

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:

  • C or C++ compiler (e. g. Microsoft Visual C++ Compiler)
  • National Instruments LabVIEW 2011 and later
  • MathWorks MATLAB R2009b and later
  • Octave 7.2
  • Python 2.7 and 3.x
PLUTO Software Features
spatial_light_modulator_configuration_manager SLM Configuration Manager Geometry / Gamma Control
Spatial Light Modulator Pattern Generator Software SLM Pattern Generator Basic DOE computations; Generation of optical functions (Circular Aperture, Fresnel Zone Lens, Axicon, Single and Double Slit …); Gratings (incl. Blazed and Sinusoidal), superposition of functions (e.g. prisms, Zernike polynomials…)
SLM_slideshow_player_icon SLM Slideshow Player Plays slideshow of user defined precalculated functions or images
Spatial Light Modulator Display SDK SLM Display SDK APIs to show images and data/ phase arrays directly on using LabVIEW, MATLAB®, Octave or Python™

Driver Dimensions (Unit: mm):

PLUTO-2 Spatial Light Modulator dimensions

Display Dimensions (Unit: mm):

PLUTO-2 LCOS SLM Display Dimensions