LETO-3 phase only fast SLM with high bandwidth
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- Model: HOLOEYE LETO
LETO-3 phase only fast SLM with high bandwidth (Reflective)
LETO
- Pixel pitch: 6.4 µm
- Fill factor: 93%
- Signal type: HDMI
- 60/180 Hz image frame rate
- Phase only modulation
- HDTV resolution (1920 x 1080)
- Reflective LCOS microdisplay
- 2π phase modulation up to 850 nm
The LETO phase modulator is based on a reflective LCOS microdisplay with full HD (1920 x 1080 pixel ) resolution. With a pixel pitch of only 6.4 µm and a small interpixel gap of 0.2 µm the LETO SLM provides a high fill factor of 93% and thereby a high light efficiency.
Three different LETO-3 LCOS Spatial Light Modulator versions are available which are optimized for the use at different wavelength ranges / for different applications.
LETO-3-VIS-009 SLM version can be used between 420nm and 800nm. The phase shift above 800 nm will be limited (below 2 Pi).
LETO-3-NIR-081 version is optimized for the range of 650 nm to 1100nm and provides 2 Pi phase shift up to 1100 nm.
A third version LETO-3-CFS-0127 SLM is optimized for fast response (180 Hz) and used for colour-field-sequential (CFS) operation in the visible range with colour-switchable RGB Laser.
LETO-3 Spatial Light Modulator driver is prepared to work in colour-field-sequential (CFS) mode e.g. with colour-switchable LASER or LED lighting and the device features an LED-connector which can be used to synchronize the light source with the device.
The driver features 4 slots with preconfigured CFS configurations for different environments which can be selected using the Configuration Manager Software.The LETO-3 Spatial Light Modulator offers a reflectivity between 62% up to 75% (dependent on wavelength and version). The device offers diffraction efficiencies of more than 80% (16 level blazed grating) which leads to a total light efficiency of ~ 60%.
The LETO-3 phase only spatial light modulator devices can simply be addressed like an external monitor using the standard HDMI interface of the graphics card. No additional software or special hardware is needed to operate the SLM.
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Elementary Optical Functions
The HOLOEYE Spatial Light Modulator Pattern Generator software was developed for use with all HOLOEYE SLM models. The software allows the simple generation of diverse dynamic optical functions like gratings, lenses, axicons and apertures as well as the calculation of diffractive optical elements (DOE) from user defined images.
Besides the generation of DOEs a wide range of basic optical functions can be created directly via the menu bar. After input of the required parameters the output image appears in a new window. There are several binary and multilevel optical functions possible:
- Blank Grey Level Screen
With this function you can create a homogeneous gray level screen.
- Horizontally Divided Screen
With this function you will create a horizontally divided screen, consisting of two homogeneous graylevel partial screens.
- Random Bitmap
With this function you will create a random pixel distribution using 256 grayscale values. This function can be used to realize the optical function of a random phase plate.
- Aperture Functions
- Rectangular Aperture
- Circular Aperture
-Single Slit and Double Slit
- Fresnel Zone Lenses
-Binary Fresnel Zone Lens
-Multilevel Fresnel Zone Lens
-Cylindrical Fresnel Zone Lens
- Binary Axicon
With this function you will create a Binary Axicon graylevel image representation.
- Axicon
With this function you will create a 256-level Axicon graylevel image representation.
- Vortex Phase
Use this function to create a 256-graylevel image representation of a vortex phase.
- Concentric ring segments
Use this function to create binary images consisting of concentric ring segments.
- Binary beam-splitter gratings
-Linear Gratings and Crossed Linear gratings
-Exemplary binary beam-splitter designs
- Sinusoidal Grating
With this function you will create a sinusoidal grating.
- Blazed Grating
With this function you will create a blazed grating.
- Calculating a beam-shaping phase function for Gaussian Input beams
-Transformation of a Gaussian beam to a circular ‘flat-top’ beam
-Transformation of a Gaussian beam to a rectangular ‘flat-top’ beam
- Superposition with an additional phase map
- e.g. for compensation of aberrations of the optical system or of the SLM
