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: 87 % / 92 % (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
Frame Rate 60 Hz

The PLUTO phase only Spatial Light Modulator (SLM) consists of a driver unit with standard digital video interface (DVI or 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 “Application 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. 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.

Applications range from holography, lithography, optical metrology, interferometry, optical tweezers, wave front corrections to phase shifting applications. The high fill factor of the display also ensures a high light efficiency.

Special Optical Features:
- Reflective LCOS Microdisplay - Phase Only Modulation
- 2 π Phase Shift up to 1550 nm - 8.0 µm Small Pixel Size

The PLUTO displays show a reflectivity of approx. 60%-75% (dpendent 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

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.

PLUTO_versions_wavelength1

Device Wavelength Range Fill Factor Comment
PLUTO-VIS-014-C 420 – 650 nm 92 %
PLUTO-VIS-006-A 420 – 700 nm 87 % High Retardation Version
PLUTO-NIR-010-A 420 – 1100 nm 92 %
PLUTO-NIR-015-C 650 – 1100 nm 92 % High Retardation Version
PLUTO-NIR-002-A 1000 – 1100 nm 87 %
PLUTO-TELCO-007-A 1520 – 1620 nm 87 %
PLUTO-TELCO-013-C 1400 – 1700 nm 92 %

PLUTO-VIS-014

Wavelength Maximum Phase Shift Average Reflectivity
452 nm 4.8π 65 %
532 nm 3.9π 65 %
650 nm 2.9π 65 %
Part no. HES-6010-VIS-014-C
Wavelength Range: 420 – 650 nm
Fill Factor: 92 %
Reflectivity: 65 %

The PLUTO-VIS-014 version can be used between 420nm and 650nm. The display is equipped with an AR coating that gives a front reflection less than 0.5% in this range. The LC cell enables at least 2π phase retardation up to 650nm.

PLUTO-VIS-006 – HR Version

Wavelength Maximum Phase Shift Average Reflectivity
452 nm 9.0π 60 %
532 nm 6.7π 60 %
633 nm 5.4π “60 %
Part no. HES-6010-VIS-006-A
Wavelength Range: 420 – 700 nm
Fill Factor: 87 %
Reflectivity: 60 %

The PLUTO-VIS-006-A version features an AR coating with front reflection less than 0.5% in the 420 – 700 nm range. Using high retardation LC material the PLUTO-VIS-006-A provides a max. phase shift up to ~ 6π (dependent on wavelength).

Using an adapted gamma curve for 2π phase shift at a certain wavelength, this version also can be used to significantly reduce phase fluctuations.

PLUTO-NIR-010

Wavelength Maximum Phase Shift Average Reflectivity
452 nm 5.5π 66 %
532 nm 4.5π 67 %
633 nm 3.6π 67 %
780 nm 3.0π 67 %
850 nm 2.6π 63 %
1064 nm 2.0π 75 %
Part no. HES-6010-NIR-010-A
Wavelength Range: 420 – 1100 nm
Fill Factor: 92 %
Reflectivity: 63 % – 75 %

The PLUTO-NIR-010-A version enables at least 2π phase retardation in the 420nm-1064nm range. The display is equipped with a broad band AR coating that enables low front reflection in this broad wavelength range. Even though the PLUTO-NIR-010-A can be used from 420nm to 1064nm it is recommended to use the VIS version in the visible range as the AR coating and response times are better.

PLUTO-NIR-015 – HR Version

Wavelength Maximum Phase Shift Average Reflectivity
650 nm 6.2π 68 %
780 nm 5.0π 65 %
850 nm 4.4π 64 %
1064 nm 3.7π 73 %
Part no. HES-6010-NIR-015-C
Wavelength Range: 650 – 1100 nm
Fill Factor: 92 %
Reflectivity: 65 % – 73 %

The PLUTO-NIR-015-C version is equipped with an AR coating for the range of 650 nm to 1100nm. Using high retardation LC material the PLUTO-NIR-015-C provides a high phase shift enabling mod 4π or even mod 6π phase functions (dependent on wavelength). Using an adapted gamma curve for 2π phase shift, this version also can be used to significantly reduce phase fluctuations.

PLUTO-NIR-002

Wavelength Maximum Phase Shift Average Reflectivity
1064 nm 2.0π 62 %
Part no. HES-6010-NIR-002-A
Wavelength Range: 1000 – 1100 nm
Fill Factor: 87 %
Reflectivity: 62 %

The PLUTO-NIR version is equipped with a small banded AR coating optimized for 1064nm. The LC cell assures ~2π phase retardation up to 1064nm.

PLUTO-TELCO-007

Wavelength Maximum Phase Shift Average Reflectivity
1550 nm 3.5π 65 %
Part no. HES-6010-TELCO-007-A
Wavelength Range: 1520 – 1620 nm
Fill Factor: 87 %
Reflectivity: 65 %

The PLUTO-TELCO-007-A version is optimized for applications in the c-band. The AR coating assures a front reflection of less than 0.5% between 1520 and 1620nm. The cell enables 2π phase retardation up to ~1600nm.

PLUTO-TELCO-013

Wavelength Maximum Phase Shift Average Reflectivity
1400 nm 3.8π 80 %
1550 nm 3.5π 80 %
1625 nm 3.4π 80 %
1700 nm 3.3π 80 %
Part no. HES-6010-TELCO-013-C
Wavelength Range: 1400 – 1700 nm
Fill Factor: 92 %
Reflectivity: 80 %

The PLUTO-TELCO-013-C version features an AR coating which assures a front reflection of less than 0.5% between 1400 and 1700nm. The display enables 2π phase retardation up to 1700nm.

PLUTO Spatial Light Modulator Kit – Contents:

PLUTO-SLM_deliverables

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 GUI (Graphical User Interface) based calibration software. The calibration software 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 HOLOEYE SLM Application Software is provided with the SLM. Key features of which are:

  • 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 Callibration Software Brightness / Contrast / Geometry / Gamma Control
SLM Application Software Basic DOE computations; Generation of optical functions (Circular Aperture, Fresnel Zone Lens, Axicon, Single and Double Slit …); Gratings (incl. Blazed and Sinusoidal)
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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