PLUTO Phase Only Spatial Light Modulator (Reflective)

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

The PLUTO 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 SLM is a plug & play phase modulator device and can be addressed with phase functions via standard graphics cards as extended monitor device. The green color channel of the video signal is used for addressing 8 bit gray level patterns (the SLMs native resolution need to be addressed). Addressing can be done using the supplied Pattern Generator software or the SLM Slideshow Player software or standard image viewer software.

HOLOEYE offers different display versions that can be driven with the PLUTO 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 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.

The PLUTO-2 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 PLUTO-2 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 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%. Thereby a total light efficiency of more than 50% per addressable diffractive device is possible.

PLUTO Phase Modulator Versions

PLUTO Spatial Light Modulator versions wavelength

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-UV-043 350 – 420 nm 90 % 2.8 Pi @ 355 nm
2.3 Pi @ 405 nm
Dielectric Mirror UV resistance
Higher Power Use
PLUTO-2-VIS-014 420 – 650 nm 65 % 3.9 Pi @ 530
2.9 Pi @ 650 nm
Fast Response Time
PLUTO-2-VIS-016 420 – 650 nm 67 % 6.7 Pi @ 530 nm
5.4 Pi @ 633 nm
High Retardation Version Low Phase Flicker
PLUTO-2-VIS-020 530 – 640 nm 75-80 % 8.2 Pi @ 530 nm
6.3 Pi @ 633 nm
High Phase Shift
PLUTO-2-VIS-056 450 – 650 nm 93-95 % 2.5 Pi @ 530 nm
2.1 Pi @ 633 nm
Dielectric Mirror Higher Power Use
PLUTO-2-NIR-011 420 – 1100 nm 65-75 % 4.5 Pi @ 530 nm
2.6 Pi @ 850 nm
2 Pi @ 1064 nm
Broadband Use
Fast Response Time
PLUTO-2-NIR-015 650 – 1100 nm 65-73 % 4.4 Pi @ 850 nm
3.7 Pi @ 1064 nm
High Retardation Version Low Phase Flicker
PLUTO-2-NIR-002 1000 – 1100 nm 62 % 2 Pi @ 1064 nm
PLUTO-2-NIR-049 1000 – 1100 nm 93 % 2 Pi @ 1064 nm Dielectric Mirror Higher Power Use
PLUTO-2-NIRO-023 1000 – 1400 nm 74 % 4.1 Pi @ 1400 nm
PLUTO-2-TELCO-013 1400 – 1700 nm 80 % 3.5 Pi @ 1550 nm

PLUTO Spatial Light Modulator Kit – Contents:


PLUTO Spatial Light Modulator – Scope of Supply
PLUTO SLM Driver Box
Phase Only Display incl. Flex Cable (1920 x 1080 Pixel)
DVI-cable & DVI/HDMI-adaptor
Serial Port Cable (RS232)
Power Supply (5V DC, 3A)
Display Mount
Device Mount
Operating Instruction / Manual
Data Medium (CD or USB Flash Drive) with Manual, User Software and Application Software and PLUTO Software Package

PLUTO Phase Modulator – Software Features:

PLUTO SLM Calibration SoftwareThe PLUTO 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 callibrations the RS232 interface has to be connected via a COM port of the computer (there are also USB to COM adapters available).

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, for LabView users a Labview SubVi for enhanced addressing of optical functions is included.

PLUTO Software Features
SLM Configuration Manager Icon SLM Configuration Manager Geometry / Gamma Control
SLM Pattern Generator Icon 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
Labview SubVi Labview SubVi for enhanced addressing of optical functions (for implementation in user defined Labview programm for e.g. closed loop applications)

Driver Dimensions (Unit: mm):

PLUTO Spatial Light Modulator Proportions

Display Dimensions (Unit: mm):

PLUTO SLM Microdisplay Dimensions

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